[{"department":[{"_id":"MiLe"},{"_id":"TaHa"}],"date_updated":"2023-08-07T08:41:29Z","article_type":"original","type":"journal_article","status":"public","_id":"13966","ec_funded":1,"volume":108,"issue":"4","publication_status":"published","publication_identifier":{"eissn":["2469-9969"],"issn":["2469-9950"]},"language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2203.12666"}],"scopus_import":"1","intvolume":" 108","month":"07","abstract":[{"text":"We present a low-scaling diagrammatic Monte Carlo approach to molecular correlation energies. Using combinatorial graph theory to encode many-body Hugenholtz diagrams, we sample the Møller-Plesset (MPn) perturbation series, obtaining accurate correlation energies up to n=5, with quadratic scaling in the number of basis functions. Our technique reduces the computational complexity of the molecular many-fermion correlation problem, opening up the possibility of low-scaling, accurate stochastic computations for a wide class of many-body systems described by Hugenholtz diagrams.","lang":"eng"}],"oa_version":"Preprint","external_id":{"arxiv":["2203.12666"]},"article_processing_charge":"No","author":[{"last_name":"Bighin","orcid":"0000-0001-8823-9777","full_name":"Bighin, Giacomo","first_name":"Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Ho","full_name":"Ho, Quoc P","id":"3DD82E3C-F248-11E8-B48F-1D18A9856A87","first_name":"Quoc P"},{"last_name":"Lemeshko","orcid":"0000-0002-6990-7802","full_name":"Lemeshko, Mikhail","id":"37CB05FA-F248-11E8-B48F-1D18A9856A87","first_name":"Mikhail"},{"last_name":"Tscherbul","full_name":"Tscherbul, T. V.","first_name":"T. V."}],"title":"Diagrammatic Monte Carlo for electronic correlation in molecules: High-order many-body perturbation theory with low scaling","citation":{"short":"G. Bighin, Q.P. Ho, M. Lemeshko, T.V. Tscherbul, Physical Review B 108 (2023).","ieee":"G. Bighin, Q. P. Ho, M. Lemeshko, and T. V. Tscherbul, “Diagrammatic Monte Carlo for electronic correlation in molecules: High-order many-body perturbation theory with low scaling,” Physical Review B, vol. 108, no. 4. American Physical Society, 2023.","apa":"Bighin, G., Ho, Q. P., Lemeshko, M., & Tscherbul, T. V. (2023). Diagrammatic Monte Carlo for electronic correlation in molecules: High-order many-body perturbation theory with low scaling. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.108.045115","ama":"Bighin G, Ho QP, Lemeshko M, Tscherbul TV. Diagrammatic Monte Carlo for electronic correlation in molecules: High-order many-body perturbation theory with low scaling. Physical Review B. 2023;108(4). doi:10.1103/PhysRevB.108.045115","mla":"Bighin, Giacomo, et al. “Diagrammatic Monte Carlo for Electronic Correlation in Molecules: High-Order Many-Body Perturbation Theory with Low Scaling.” Physical Review B, vol. 108, no. 4, 045115, American Physical Society, 2023, doi:10.1103/PhysRevB.108.045115.","ista":"Bighin G, Ho QP, Lemeshko M, Tscherbul TV. 2023. Diagrammatic Monte Carlo for electronic correlation in molecules: High-order many-body perturbation theory with low scaling. Physical Review B. 108(4), 045115.","chicago":"Bighin, Giacomo, Quoc P Ho, Mikhail Lemeshko, and T. V. Tscherbul. “Diagrammatic Monte Carlo for Electronic Correlation in Molecules: High-Order Many-Body Perturbation Theory with Low Scaling.” Physical Review B. American Physical Society, 2023. https://doi.org/10.1103/PhysRevB.108.045115."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","project":[{"name":"A path-integral approach to composite impurities","grant_number":"M02641","call_identifier":"FWF","_id":"26986C82-B435-11E9-9278-68D0E5697425"},{"grant_number":"M02751","name":"Algebro-Geometric Applications of Factorization Homology","call_identifier":"FWF","_id":"26B96266-B435-11E9-9278-68D0E5697425"},{"call_identifier":"FWF","_id":"26031614-B435-11E9-9278-68D0E5697425","name":"Quantum rotations in the presence of a many-body environment","grant_number":"P29902"},{"call_identifier":"H2020","_id":"2688CF98-B435-11E9-9278-68D0E5697425","grant_number":"801770","name":"Angulon: physics and applications of a new quasiparticle"}],"article_number":"045115","date_created":"2023-08-06T22:01:10Z","doi":"10.1103/PhysRevB.108.045115","date_published":"2023-07-15T00:00:00Z","year":"2023","publication":"Physical Review B","day":"15","oa":1,"publisher":"American Physical Society","quality_controlled":"1","acknowledgement":"We acknowledge stimulating discussions with Sergey Varganov, Artur Izmaylov, Jacek Kłos, Piotr Żuchowski, Dominika Zgid, Nikolay Prokof'ev, Boris Svistunov, Robert Parrish, and Andreas Heßelmann. G.B. and Q.P.H. acknowledge support from the Austrian Science Fund (FWF) under Projects No. M2641-N27 and No. M2751. M.L. acknowledges support by the FWF under Project No. P29902-N27, and by the European Research Council (ERC) Starting Grant No. 801770 (ANGULON). T.V.T. was supported by the NSF CAREER award No. PHY-2045681. This work is supported by the German Research Foundation (DFG) under Germany's Excellence Strategy EXC2181/1-390900948 (the Heidelberg STRUCTURES Excellence Cluster). The authors acknowledge support by the state of Baden-Württemberg through bwHPC."},{"oa_version":"Published Version","abstract":[{"lang":"eng","text":"We study the out-of-equilibrium quantum dynamics of dipolar polarons, i.e., impurities immersed in a dipolar Bose-Einstein condensate, after a quench of the impurity-boson interaction. We show that the dipolar nature of the condensate and of the impurity results in anisotropic relaxation dynamics, in particular, anisotropic dressing of the polaron. More relevantly for cold-atom setups, quench dynamics is strongly affected by the interplay between dipolar anisotropy and trap geometry. Our findings pave the way for simulating impurities in anisotropic media utilizing experiments with dipolar mixtures."}],"intvolume":" 15","month":"12","language":[{"iso":"eng"}],"file":[{"access_level":"open_access","relation":"main_file","content_type":"application/pdf","checksum":"e664372a1fe9d628a9bb1d135ebab7d8","file_id":"14669","success":1,"creator":"dernst","date_updated":"2023-12-11T07:42:04Z","file_size":3543541,"date_created":"2023-12-11T07:42:04Z","file_name":"2023_SciPostPhysics_Volosniev.pdf"}],"publication_status":"published","publication_identifier":{"issn":["2542-4653"]},"ec_funded":1,"volume":15,"issue":"6","_id":"14650","keyword":["General Physics and Astronomy"],"status":"public","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"article_type":"original","type":"journal_article","ddc":["530"],"date_updated":"2023-12-11T07:44:08Z","department":[{"_id":"MiLe"}],"file_date_updated":"2023-12-11T07:42:04Z","acknowledgement":"We thank Lauriane Chomaz for useful discussions and comments on the manuscript. We also\r\nthank Ragheed Al Hyder for comments on the manuscript.\r\nG.B. acknowledges support from the Austrian Science Fund (FWF),\r\nunder Project No. M2641-N27. This work is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy EXC2181/1-\r\n390900948 (the Heidelberg STRUCTURES Excellence Cluster). A. G. V. acknowledges support from the European Union’s Horizon 2020 research and innovation programme under the\r\nMarie Skłodowska-Curie Grant Agreement No. 754411. L.A.P.A acknowledges by the PNRR\r\nMUR project PE0000023 - NQSTI and the Deutsche Forschungsgemeinschaft (DFG, German\r\nResearch Foundation) under Germany’s Excellence Strategy - EXC - 2123 Quantum Frontiers390837967 and FOR2247.","oa":1,"quality_controlled":"1","publisher":"SciPost Foundation","publication":"SciPost Physics","day":"07","year":"2023","has_accepted_license":"1","date_created":"2023-12-10T13:03:07Z","date_published":"2023-12-07T00:00:00Z","doi":"10.21468/scipostphys.15.6.232","article_number":"232","project":[{"call_identifier":"FWF","_id":"26986C82-B435-11E9-9278-68D0E5697425","name":"A path-integral approach to composite impurities","grant_number":"M02641"},{"name":"ISTplus - Postdoctoral Fellowships","grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"chicago":"Volosniev, Artem, Giacomo Bighin, Luis Santos, and Luisllu A. Peña Ardila. “Non-Equilibrium Dynamics of Dipolar Polarons.” SciPost Physics. SciPost Foundation, 2023. https://doi.org/10.21468/scipostphys.15.6.232.","ista":"Volosniev A, Bighin G, Santos L, Peña Ardila LA. 2023. Non-equilibrium dynamics of dipolar polarons. SciPost Physics. 15(6), 232.","mla":"Volosniev, Artem, et al. “Non-Equilibrium Dynamics of Dipolar Polarons.” SciPost Physics, vol. 15, no. 6, 232, SciPost Foundation, 2023, doi:10.21468/scipostphys.15.6.232.","apa":"Volosniev, A., Bighin, G., Santos, L., & Peña Ardila, L. A. (2023). Non-equilibrium dynamics of dipolar polarons. SciPost Physics. SciPost Foundation. https://doi.org/10.21468/scipostphys.15.6.232","ama":"Volosniev A, Bighin G, Santos L, Peña Ardila LA. Non-equilibrium dynamics of dipolar polarons. SciPost Physics. 2023;15(6). doi:10.21468/scipostphys.15.6.232","ieee":"A. Volosniev, G. Bighin, L. Santos, and L. A. Peña Ardila, “Non-equilibrium dynamics of dipolar polarons,” SciPost Physics, vol. 15, no. 6. SciPost Foundation, 2023.","short":"A. Volosniev, G. Bighin, L. Santos, L.A. Peña Ardila, SciPost Physics 15 (2023)."},"title":"Non-equilibrium dynamics of dipolar polarons","article_processing_charge":"No","external_id":{"arxiv":["2305.17969"]},"author":[{"last_name":"Volosniev","orcid":"0000-0003-0393-5525","full_name":"Volosniev, Artem","id":"37D278BC-F248-11E8-B48F-1D18A9856A87","first_name":"Artem"},{"orcid":"0000-0001-8823-9777","full_name":"Bighin, Giacomo","last_name":"Bighin","first_name":"Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Luis","last_name":"Santos","full_name":"Santos, Luis"},{"full_name":"Peña Ardila, Luisllu A.","last_name":"Peña Ardila","first_name":"Luisllu A."}]},{"date_updated":"2023-08-03T12:00:11Z","department":[{"_id":"MiLe"}],"_id":"11592","article_type":"original","type":"journal_article","status":"public","publication_identifier":{"issn":["2469-9926"],"eissn":["2469-9934"]},"publication_status":"published","language":[{"iso":"eng"}],"volume":105,"issue":"6","abstract":[{"lang":"eng","text":"We compare recent experimental results [Science 375, 528 (2022)] of the superfluid unitary Fermi gas near the critical temperature with a thermodynamic model based on the elementary excitations of the system. We find good agreement between experimental data and our theory for several quantities such as first sound, second sound, and superfluid fraction. We also show that mode mixing between first and second sound occurs. Finally, we characterize the response amplitude to a density perturbation: Close to the critical temperature both first and second sound can be excited through a density perturbation, whereas at lower temperatures only the first sound mode exhibits a significant response."}],"oa_version":"Preprint","scopus_import":"1","main_file_link":[{"url":" https://doi.org/10.48550/arXiv.2206.03924","open_access":"1"}],"month":"06","intvolume":" 105","citation":{"chicago":"Bighin, Giacomo, Alberto Cappellaro, and L. Salasnich. “Unitary Fermi Superfluid near the Critical Temperature: Thermodynamics and Sound Modes from Elementary Excitations.” Physical Review A. American Physical Society, 2022. https://doi.org/10.1103/PhysRevA.105.063329.","ista":"Bighin G, Cappellaro A, Salasnich L. 2022. Unitary Fermi superfluid near the critical temperature: Thermodynamics and sound modes from elementary excitations. Physical Review A. 105(6), 063329.","mla":"Bighin, Giacomo, et al. “Unitary Fermi Superfluid near the Critical Temperature: Thermodynamics and Sound Modes from Elementary Excitations.” Physical Review A, vol. 105, no. 6, 063329, American Physical Society, 2022, doi:10.1103/PhysRevA.105.063329.","ieee":"G. Bighin, A. Cappellaro, and L. Salasnich, “Unitary Fermi superfluid near the critical temperature: Thermodynamics and sound modes from elementary excitations,” Physical Review A, vol. 105, no. 6. American Physical Society, 2022.","short":"G. Bighin, A. Cappellaro, L. Salasnich, Physical Review A 105 (2022).","ama":"Bighin G, Cappellaro A, Salasnich L. Unitary Fermi superfluid near the critical temperature: Thermodynamics and sound modes from elementary excitations. Physical Review A. 2022;105(6). doi:10.1103/PhysRevA.105.063329","apa":"Bighin, G., Cappellaro, A., & Salasnich, L. (2022). Unitary Fermi superfluid near the critical temperature: Thermodynamics and sound modes from elementary excitations. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.105.063329"},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","author":[{"id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","first_name":"Giacomo","full_name":"Bighin, Giacomo","orcid":"0000-0001-8823-9777","last_name":"Bighin"},{"first_name":"Alberto","id":"9d13b3cb-30a2-11eb-80dc-f772505e8660","orcid":"0000-0001-6110-2359","full_name":"Cappellaro, Alberto","last_name":"Cappellaro"},{"last_name":"Salasnich","full_name":"Salasnich, L.","first_name":"L."}],"external_id":{"arxiv":["2206.03924"],"isi":["000829758500010"]},"article_processing_charge":"No","title":"Unitary Fermi superfluid near the critical temperature: Thermodynamics and sound modes from elementary excitations","article_number":"063329","isi":1,"year":"2022","day":"30","publication":"Physical Review A","date_published":"2022-06-30T00:00:00Z","doi":"10.1103/PhysRevA.105.063329","date_created":"2022-07-17T22:01:55Z","acknowledgement":"The authors gratefully acknowledge stimulating discussions with T. Enss, and thank an anonymous referee for suggestions and remarks that allowed us to improve the original manuscript. This work is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy EXC2181/1-390900948 (the Heidelberg STRUCTURES Excellence Cluster).","publisher":"American Physical Society","quality_controlled":"1","oa":1},{"department":[{"_id":"MiLe"}],"file_date_updated":"2022-08-29T09:57:40Z","ddc":["530"],"date_updated":"2023-08-03T13:19:06Z","status":"public","type":"journal_article","article_type":"original","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"_id":"11998","volume":24,"issue":"7","ec_funded":1,"file":[{"relation":"main_file","access_level":"open_access","content_type":"application/pdf","success":1,"file_id":"12005","checksum":"10116a08d3489befc13dba2cc44490f1","creator":"alisjak","file_size":1912882,"date_updated":"2022-08-29T09:57:40Z","file_name":"2022_NewJournalofPhysics_Cherepanov.pdf","date_created":"2022-08-29T09:57:40Z"}],"language":[{"iso":"eng"}],"publication_identifier":{"issn":["1367-2630"]},"publication_status":"published","month":"08","intvolume":" 24","scopus_import":"1","oa_version":"Published Version","abstract":[{"lang":"eng","text":"Recently it became possible to study highly excited rotational states of molecules in superfluid helium through nonadiabatic alignment experiments (Cherepanov et al 2021 Phys. Rev. A 104 L061303). This calls for theoretical approaches that go beyond explaining renormalized values of molecular spectroscopic constants, which suffices when only the lowest few rotational states are involved. As the first step in this direction, here we present a basic quantum mechanical model describing highly excited rotational states of molecules in superfluid helium nanodroplets. We show that a linear molecule immersed in a superfluid can be seen as an effective symmetric top, similar to the rotational structure of radicals, such as OH or NO, but with the angular momentum of the superfluid playing the role of the electronic angular momentum in free molecules. The simple theory sheds light onto what happens when the rotational angular momentum of the molecule increases beyond the lowest excited states accessible by infrared spectroscopy. In addition, the model allows to estimate the effective rotational and centrifugal distortion constants for a broad range of species and to explain the crossover between light and heavy molecules in superfluid 4He in terms of the many-body wavefunction structure. Some of the above mentioned insights can be acquired by analyzing a simple 2 × 2 matrix."}],"title":"A simple model for high rotational excitations of molecules in a superfluid","author":[{"full_name":"Cherepanov, Igor","last_name":"Cherepanov","first_name":"Igor","id":"339C7E5A-F248-11E8-B48F-1D18A9856A87"},{"id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","first_name":"Giacomo","full_name":"Bighin, Giacomo","orcid":"0000-0001-8823-9777","last_name":"Bighin"},{"full_name":"Schouder, Constant A.","last_name":"Schouder","first_name":"Constant A."},{"first_name":"Adam S.","full_name":"Chatterley, Adam S.","last_name":"Chatterley"},{"first_name":"Henrik","last_name":"Stapelfeldt","full_name":"Stapelfeldt, Henrik"},{"last_name":"Lemeshko","orcid":"0000-0002-6990-7802","full_name":"Lemeshko, Mikhail","first_name":"Mikhail","id":"37CB05FA-F248-11E8-B48F-1D18A9856A87"}],"article_processing_charge":"Yes","external_id":{"isi":["000839216900001"]},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","citation":{"ista":"Cherepanov I, Bighin G, Schouder CA, Chatterley AS, Stapelfeldt H, Lemeshko M. 2022. A simple model for high rotational excitations of molecules in a superfluid. New Journal of Physics. 24(7), 075004.","chicago":"Cherepanov, Igor, Giacomo Bighin, Constant A. Schouder, Adam S. Chatterley, Henrik Stapelfeldt, and Mikhail Lemeshko. “A Simple Model for High Rotational Excitations of Molecules in a Superfluid.” New Journal of Physics. IOP, 2022. https://doi.org/10.1088/1367-2630/ac8113.","short":"I. Cherepanov, G. Bighin, C.A. Schouder, A.S. Chatterley, H. Stapelfeldt, M. Lemeshko, New Journal of Physics 24 (2022).","ieee":"I. Cherepanov, G. Bighin, C. A. Schouder, A. S. Chatterley, H. Stapelfeldt, and M. Lemeshko, “A simple model for high rotational excitations of molecules in a superfluid,” New Journal of Physics, vol. 24, no. 7. IOP, 2022.","ama":"Cherepanov I, Bighin G, Schouder CA, Chatterley AS, Stapelfeldt H, Lemeshko M. A simple model for high rotational excitations of molecules in a superfluid. New Journal of Physics. 2022;24(7). doi:10.1088/1367-2630/ac8113","apa":"Cherepanov, I., Bighin, G., Schouder, C. A., Chatterley, A. S., Stapelfeldt, H., & Lemeshko, M. (2022). A simple model for high rotational excitations of molecules in a superfluid. New Journal of Physics. IOP. https://doi.org/10.1088/1367-2630/ac8113","mla":"Cherepanov, Igor, et al. “A Simple Model for High Rotational Excitations of Molecules in a Superfluid.” New Journal of Physics, vol. 24, no. 7, 075004, IOP, 2022, doi:10.1088/1367-2630/ac8113."},"project":[{"name":"International IST Doctoral Program","grant_number":"665385","_id":"2564DBCA-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"},{"_id":"2688CF98-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Angulon: physics and applications of a new quasiparticle","grant_number":"801770"},{"grant_number":"M02641","name":"A path-integral approach to composite impurities","_id":"26986C82-B435-11E9-9278-68D0E5697425","call_identifier":"FWF"}],"article_number":"075004","doi":"10.1088/1367-2630/ac8113","date_published":"2022-08-11T00:00:00Z","date_created":"2022-08-28T22:02:01Z","day":"11","publication":"New Journal of Physics","has_accepted_license":"1","isi":1,"year":"2022","quality_controlled":"1","publisher":"IOP","oa":1,"acknowledgement":"IC acknowledges the support by the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreement No. 665385. GB acknowledges support from the Austrian Science Fund (FWF), under Project No. M2461-N27 and from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy EXC2181/1-390900948 (the Heidelberg STRUCTURES Excellence Cluster). ML acknowledges support by the Austrian Science Fund (FWF), under Project No. P29902-N27, and by the European Research Council (ERC) starting Grant No. 801770 (ANGULON). HS acknowledges support from the Independent Research Fund Denmark (Project No. 8021-00232B) and from the Villum Fonden through a Villum Investigator Grant No. 25886."},{"oa":1,"quality_controlled":"1","publisher":"American Physical Society","acknowledgement":"We thank A. Simoni for providing the calculations of the intercomponent scattering lengths. We gratefully acknowledge stimulating discussions with L. A. Peña Ardila, R. Schmidt, H. Silva, V. Zampronio, and M. Prevedelli for careful reading. G.B. acknowledges support from the Austrian Science Fund (FWF) under Project No. M2641-N27. T.M. acknowledges CNPq for support through Bolsa de produtividade em Pesquisa No. 311079/2015-6. This work is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy No. EXC2181/1-390900948 (the Heidelberg STRUCTURES Excellence Cluster). This work was supported by the Serrapilheira Institute (Grant No. Serra-1812-27802). We thank the High-Performance Computing Center (NPAD) at UFRN for providing computational resources.","date_created":"2022-08-28T22:02:00Z","date_published":"2022-08-04T00:00:00Z","doi":"10.1103/PhysRevA.106.023301","year":"2022","isi":1,"publication":"Physical Review A","day":"04","project":[{"name":"A path-integral approach to composite impurities","grant_number":"M02641","_id":"26986C82-B435-11E9-9278-68D0E5697425","call_identifier":"FWF"}],"article_number":"023301","article_processing_charge":"No","external_id":{"arxiv":["2109.07451"],"isi":["000837953600006"]},"author":[{"last_name":"Bighin","orcid":"0000-0001-8823-9777","full_name":"Bighin, Giacomo","first_name":"Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87"},{"first_name":"A.","full_name":"Burchianti, A.","last_name":"Burchianti"},{"full_name":"Minardi, F.","last_name":"Minardi","first_name":"F."},{"full_name":"Macrì, T.","last_name":"Macrì","first_name":"T."}],"title":"Impurity in a heteronuclear two-component Bose mixture","citation":{"chicago":"Bighin, Giacomo, A. Burchianti, F. Minardi, and T. Macrì. “Impurity in a Heteronuclear Two-Component Bose Mixture.” Physical Review A. American Physical Society, 2022. https://doi.org/10.1103/PhysRevA.106.023301.","ista":"Bighin G, Burchianti A, Minardi F, Macrì T. 2022. Impurity in a heteronuclear two-component Bose mixture. Physical Review A. 106(2), 023301.","mla":"Bighin, Giacomo, et al. “Impurity in a Heteronuclear Two-Component Bose Mixture.” Physical Review A, vol. 106, no. 2, 023301, American Physical Society, 2022, doi:10.1103/PhysRevA.106.023301.","ama":"Bighin G, Burchianti A, Minardi F, Macrì T. Impurity in a heteronuclear two-component Bose mixture. Physical Review A. 2022;106(2). doi:10.1103/PhysRevA.106.023301","apa":"Bighin, G., Burchianti, A., Minardi, F., & Macrì, T. (2022). Impurity in a heteronuclear two-component Bose mixture. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.106.023301","ieee":"G. Bighin, A. Burchianti, F. Minardi, and T. Macrì, “Impurity in a heteronuclear two-component Bose mixture,” Physical Review A, vol. 106, no. 2. American Physical Society, 2022.","short":"G. Bighin, A. Burchianti, F. Minardi, T. Macrì, Physical Review A 106 (2022)."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2109.07451"}],"scopus_import":"1","intvolume":" 106","month":"08","abstract":[{"text":"We study the fate of an impurity in an ultracold heteronuclear Bose mixture, focusing on the experimentally relevant case of a ⁴¹K - ⁸⁷Rb mixture, with the impurity in a ⁴¹K hyperfine state. Our paper provides a comprehensive description of an impurity in a BEC mixture with contact interactions across its phase diagram. We present results for the miscible and immiscible regimes, as well as for the impurity in a self-bound quantum droplet. Here, varying the interactions, we find exotic states where the impurity localizes either at the center or\r\nat the surface of the droplet. ","lang":"eng"}],"oa_version":"Preprint","issue":"2","volume":106,"publication_status":"published","publication_identifier":{"eissn":["2469-9934"],"issn":["2469-9926"]},"language":[{"iso":"eng"}],"article_type":"original","type":"journal_article","status":"public","_id":"11997","department":[{"_id":"MiLe"}],"date_updated":"2023-08-03T13:20:42Z"},{"publication":"Symmetry","day":"17","year":"2022","has_accepted_license":"1","isi":1,"date_created":"2023-01-12T12:08:31Z","doi":"10.3390/sym14102182","date_published":"2022-10-17T00:00:00Z","acknowledgement":"This research is partially supported by University of Padova, BIRD grant “Ultracold atoms\r\nin curved geometries”. KF is supported by Fondazione CARIPARO with a PhD fellowship. AT is\r\npartially supported by French National Research Agency ANR Grant Droplets N. ANR-19-CE30-0003-02. LS thanks Herwig Ott and Sandro Wimberger for their kind invitation to the\r\nInternational Workshop “Quantum Transport with ultracold atoms” (2022).","oa":1,"quality_controlled":"1","publisher":"MDPI","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","citation":{"mla":"Salasnich, Luca, et al. “First and Second Sound in Two-Dimensional Bosonic and Fermionic Superfluids.” Symmetry, vol. 14, no. 10, 2182, MDPI, 2022, doi:10.3390/sym14102182.","short":"L. Salasnich, A. Cappellaro, K. Furutani, A. Tononi, G. Bighin, Symmetry 14 (2022).","ieee":"L. Salasnich, A. Cappellaro, K. Furutani, A. Tononi, and G. Bighin, “First and second sound in two-dimensional bosonic and fermionic superfluids,” Symmetry, vol. 14, no. 10. MDPI, 2022.","apa":"Salasnich, L., Cappellaro, A., Furutani, K., Tononi, A., & Bighin, G. (2022). First and second sound in two-dimensional bosonic and fermionic superfluids. Symmetry. MDPI. https://doi.org/10.3390/sym14102182","ama":"Salasnich L, Cappellaro A, Furutani K, Tononi A, Bighin G. First and second sound in two-dimensional bosonic and fermionic superfluids. Symmetry. 2022;14(10). doi:10.3390/sym14102182","chicago":"Salasnich, Luca, Alberto Cappellaro, Koichiro Furutani, Andrea Tononi, and Giacomo Bighin. “First and Second Sound in Two-Dimensional Bosonic and Fermionic Superfluids.” Symmetry. MDPI, 2022. https://doi.org/10.3390/sym14102182.","ista":"Salasnich L, Cappellaro A, Furutani K, Tononi A, Bighin G. 2022. First and second sound in two-dimensional bosonic and fermionic superfluids. Symmetry. 14(10), 2182."},"title":"First and second sound in two-dimensional bosonic and fermionic superfluids","external_id":{"isi":["000875039200001"]},"article_processing_charge":"Yes","author":[{"first_name":"Luca","last_name":"Salasnich","full_name":"Salasnich, Luca"},{"last_name":"Cappellaro","orcid":"0000-0001-6110-2359","full_name":"Cappellaro, Alberto","first_name":"Alberto","id":"9d13b3cb-30a2-11eb-80dc-f772505e8660"},{"first_name":"Koichiro","full_name":"Furutani, Koichiro","last_name":"Furutani"},{"first_name":"Andrea","full_name":"Tononi, Andrea","last_name":"Tononi"},{"first_name":"Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","last_name":"Bighin","full_name":"Bighin, Giacomo","orcid":"0000-0001-8823-9777"}],"article_number":"2182","language":[{"iso":"eng"}],"file":[{"date_created":"2023-01-24T10:56:12Z","file_name":"2022_Symmetry_Salsnich.pdf","creator":"dernst","date_updated":"2023-01-24T10:56:12Z","file_size":843723,"checksum":"9b6bd0e484834dd76d7b26e3c5fba8bd","file_id":"12361","success":1,"access_level":"open_access","relation":"main_file","content_type":"application/pdf"}],"publication_status":"published","publication_identifier":{"issn":["2073-8994"]},"volume":14,"issue":"10","oa_version":"Published Version","abstract":[{"text":"We review our theoretical results of the sound propagation in two-dimensional (2D) systems of ultracold fermionic and bosonic atoms. In the superfluid phase, characterized by the spontaneous symmetry breaking of the U(1) symmetry, there is the coexistence of first and second sound. In the case of weakly-interacting repulsive bosons, we model the recent measurements of the sound velocities of 39K atoms in 2D obtained in the weakly-interacting regime and around the Berezinskii–Kosterlitz–Thouless (BKT) superfluid-to-normal transition temperature. In particular, we perform a quite accurate computation of the superfluid density and show that it is reasonably consistent with the experimental results. For superfluid attractive fermions, we calculate the first and second sound velocities across the whole BCS-BEC crossover. In the low-temperature regime, we reproduce the recent measurements of first-sound speed with 6Li atoms. We also predict that there is mixing between sound modes only in the finite-temperature BEC regime.","lang":"eng"}],"intvolume":" 14","month":"10","scopus_import":"1","ddc":["530"],"date_updated":"2023-08-09T10:13:17Z","department":[{"_id":"MiLe"}],"file_date_updated":"2023-01-24T10:56:12Z","_id":"12154","keyword":["Physics and Astronomy (miscellaneous)","General Mathematics","Chemistry (miscellaneous)","Computer Science (miscellaneous)"],"status":"public","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"type":"journal_article","article_type":"original"},{"date_created":"2021-06-27T22:01:49Z","date_published":"2021-06-01T00:00:00Z","doi":"10.1103/PhysRevA.103.L061303","year":"2021","isi":1,"publication":"Physical Review A","day":"01","oa":1,"publisher":"American Physical Society","quality_controlled":"1","acknowledgement":"G.B. acknowledges support from the Austrian Science Fund (FWF), under Project No. M2641-N27. This work was\r\npartially supported by the University of Padua, BIRD project “Superfluid properties of Fermi gases in optical potentials.”\r\nThe authors thank Miki Ota, Tomoki Ozawa, Sandro Stringari, Tilman Enss, Hauke Biss, Henning Moritz, and Nicolò Defenu for fruitful discussions. The authors thank Henning Moritz and Markus Bohlen for providing their experimental\r\ndata.","article_processing_charge":"No","external_id":{"isi":["000662296700014"],"arxiv":["2009.06491"]},"author":[{"last_name":"Tononi","full_name":"Tononi, A.","first_name":"A."},{"last_name":"Cappellaro","orcid":"0000-0001-6110-2359","full_name":"Cappellaro, Alberto","id":"9d13b3cb-30a2-11eb-80dc-f772505e8660","first_name":"Alberto"},{"orcid":"0000-0001-8823-9777","full_name":"Bighin, Giacomo","last_name":"Bighin","first_name":"Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Salasnich, L.","last_name":"Salasnich","first_name":"L."}],"title":"Propagation of first and second sound in a two-dimensional Fermi superfluid","citation":{"ista":"Tononi A, Cappellaro A, Bighin G, Salasnich L. 2021. Propagation of first and second sound in a two-dimensional Fermi superfluid. Physical Review A. 103(6), L061303.","chicago":"Tononi, A., Alberto Cappellaro, Giacomo Bighin, and L. Salasnich. “Propagation of First and Second Sound in a Two-Dimensional Fermi Superfluid.” Physical Review A. American Physical Society, 2021. https://doi.org/10.1103/PhysRevA.103.L061303.","ieee":"A. Tononi, A. Cappellaro, G. Bighin, and L. Salasnich, “Propagation of first and second sound in a two-dimensional Fermi superfluid,” Physical Review A, vol. 103, no. 6. American Physical Society, 2021.","short":"A. Tononi, A. Cappellaro, G. Bighin, L. Salasnich, Physical Review A 103 (2021).","apa":"Tononi, A., Cappellaro, A., Bighin, G., & Salasnich, L. (2021). Propagation of first and second sound in a two-dimensional Fermi superfluid. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.103.L061303","ama":"Tononi A, Cappellaro A, Bighin G, Salasnich L. Propagation of first and second sound in a two-dimensional Fermi superfluid. Physical Review A. 2021;103(6). doi:10.1103/PhysRevA.103.L061303","mla":"Tononi, A., et al. “Propagation of First and Second Sound in a Two-Dimensional Fermi Superfluid.” Physical Review A, vol. 103, no. 6, L061303, American Physical Society, 2021, doi:10.1103/PhysRevA.103.L061303."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","article_number":"L061303","issue":"6","volume":103,"publication_status":"published","publication_identifier":{"eissn":["24699934"],"issn":["24699926"]},"language":[{"iso":"eng"}],"main_file_link":[{"url":"https://arxiv.org/abs/2009.06491","open_access":"1"}],"scopus_import":"1","intvolume":" 103","month":"06","abstract":[{"text":"Sound propagation is a macroscopic manifestation of the interplay between the equilibrium thermodynamics and the dynamical transport properties of fluids. Here, for a two-dimensional system of ultracold fermions, we calculate the first and second sound velocities across the whole BCS-BEC crossover, and we analyze the system response to an external perturbation. In the low-temperature regime we reproduce the recent measurements [Phys. Rev. Lett. 124, 240403 (2020)] of the first sound velocity, which, due to the decoupling of density and entropy fluctuations, is the sole mode excited by a density probe. Conversely, a heat perturbation excites only the second sound, which, being sensitive to the superfluid depletion, vanishes in the deep BCS regime and jumps discontinuously to zero at the Berezinskii-Kosterlitz-Thouless superfluid transition. A mixing between the modes occurs only in the finite-temperature BEC regime, where our theory converges to the purely bosonic results.","lang":"eng"}],"oa_version":"Preprint","department":[{"_id":"MiLe"}],"date_updated":"2023-08-10T13:37:25Z","type":"journal_article","article_type":"letter_note","status":"public","_id":"9606"},{"date_updated":"2023-08-17T06:52:17Z","department":[{"_id":"MiLe"}],"_id":"10631","type":"journal_article","article_type":"original","status":"public","publication_status":"published","publication_identifier":{"issn":["2469-9926"],"eissn":["2469-9934"]},"language":[{"iso":"eng"}],"ec_funded":1,"issue":"6","volume":104,"abstract":[{"lang":"eng","text":"We combine experimental and theoretical approaches to explore excited rotational states of molecules embedded in helium nanodroplets using CS2 and I2 as examples. Laser-induced nonadiabatic molecular alignment is employed to measure spectral lines for rotational states extending beyond those initially populated at the 0.37 K droplet temperature. We construct a simple quantum-mechanical model, based on a linear rotor coupled to a single-mode bosonic bath, to determine the rotational energy structure in its entirety. The calculated and measured spectral lines are in good agreement. We show that the effect of the surrounding superfluid on molecular rotation can be rationalized by a single quantity, the angular momentum, transferred from the molecule to the droplet."}],"oa_version":"Preprint","main_file_link":[{"url":"http://128.84.4.18/abs/2107.00468","open_access":"1"}],"scopus_import":"1","intvolume":" 104","month":"12","citation":{"chicago":"Cherepanov, Igor, Giacomo Bighin, Constant A. Schouder, Adam S. Chatterley, Simon H. Albrechtsen, Alberto Viñas Muñoz, Lars Christiansen, Henrik Stapelfeldt, and Mikhail Lemeshko. “Excited Rotational States of Molecules in a Superfluid.” Physical Review A. American Physical Society, 2021. https://doi.org/10.1103/PhysRevA.104.L061303.","ista":"Cherepanov I, Bighin G, Schouder CA, Chatterley AS, Albrechtsen SH, Muñoz AV, Christiansen L, Stapelfeldt H, Lemeshko M. 2021. Excited rotational states of molecules in a superfluid. Physical Review A. 104(6), L061303.","mla":"Cherepanov, Igor, et al. “Excited Rotational States of Molecules in a Superfluid.” Physical Review A, vol. 104, no. 6, L061303, American Physical Society, 2021, doi:10.1103/PhysRevA.104.L061303.","ieee":"I. Cherepanov et al., “Excited rotational states of molecules in a superfluid,” Physical Review A, vol. 104, no. 6. American Physical Society, 2021.","short":"I. Cherepanov, G. Bighin, C.A. Schouder, A.S. Chatterley, S.H. Albrechtsen, A.V. Muñoz, L. Christiansen, H. Stapelfeldt, M. Lemeshko, Physical Review A 104 (2021).","apa":"Cherepanov, I., Bighin, G., Schouder, C. A., Chatterley, A. S., Albrechtsen, S. H., Muñoz, A. V., … Lemeshko, M. (2021). Excited rotational states of molecules in a superfluid. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.104.L061303","ama":"Cherepanov I, Bighin G, Schouder CA, et al. Excited rotational states of molecules in a superfluid. Physical Review A. 2021;104(6). doi:10.1103/PhysRevA.104.L061303"},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","article_processing_charge":"No","external_id":{"isi":["000739618300001"],"arxiv":["2107.00468"]},"author":[{"id":"339C7E5A-F248-11E8-B48F-1D18A9856A87","first_name":"Igor","last_name":"Cherepanov","full_name":"Cherepanov, Igor"},{"first_name":"Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","last_name":"Bighin","full_name":"Bighin, Giacomo","orcid":"0000-0001-8823-9777"},{"first_name":"Constant A.","last_name":"Schouder","full_name":"Schouder, Constant A."},{"first_name":"Adam S.","last_name":"Chatterley","full_name":"Chatterley, Adam S."},{"last_name":"Albrechtsen","full_name":"Albrechtsen, Simon H.","first_name":"Simon H."},{"full_name":"Muñoz, Alberto Viñas","last_name":"Muñoz","first_name":"Alberto Viñas"},{"first_name":"Lars","full_name":"Christiansen, Lars","last_name":"Christiansen"},{"last_name":"Stapelfeldt","full_name":"Stapelfeldt, Henrik","first_name":"Henrik"},{"id":"37CB05FA-F248-11E8-B48F-1D18A9856A87","first_name":"Mikhail","full_name":"Lemeshko, Mikhail","orcid":"0000-0002-6990-7802","last_name":"Lemeshko"}],"title":"Excited rotational states of molecules in a superfluid","article_number":"L061303","project":[{"grant_number":"P29902","name":"Quantum rotations in the presence of a many-body environment","call_identifier":"FWF","_id":"26031614-B435-11E9-9278-68D0E5697425"},{"call_identifier":"H2020","_id":"2688CF98-B435-11E9-9278-68D0E5697425","name":"Angulon: physics and applications of a new quasiparticle","grant_number":"801770"},{"call_identifier":"H2020","_id":"2564DBCA-B435-11E9-9278-68D0E5697425","name":"International IST Doctoral Program","grant_number":"665385"},{"_id":"26986C82-B435-11E9-9278-68D0E5697425","call_identifier":"FWF","name":"A path-integral approach to composite impurities","grant_number":"M02641"}],"year":"2021","isi":1,"publication":"Physical Review A","day":"30","date_created":"2022-01-16T23:01:29Z","doi":"10.1103/PhysRevA.104.L061303","date_published":"2021-12-30T00:00:00Z","acknowledgement":"I.C. acknowledges the support by the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement No. 665385. G.B. acknowledges support from the Austrian Science Fund (FWF), under project No. M2461-N27. M.L. acknowledges support by the Austrian Science Fund (FWF), under project No. P29902-N27, and by the European Research Council (ERC) Starting Grant No. 801770 (ANGULON). H.S acknowledges support from the European Research Council-AdG (Project No. 320459, DropletControl) and from The Villum Foundation through a Villum Investigator grant no. 25886.","oa":1,"quality_controlled":"1","publisher":"American Physical Society"},{"department":[{"_id":"MiLe"}],"date_updated":"2023-08-22T08:22:43Z","type":"journal_article","article_type":"original","status":"public","_id":"8170","ec_funded":1,"volume":125,"issue":"1","publication_status":"published","publication_identifier":{"issn":["00319007"],"eissn":["10797114"]},"language":[{"iso":"eng"}],"main_file_link":[{"url":"https://arxiv.org/abs/2006.02694","open_access":"1"}],"scopus_import":"1","intvolume":" 125","month":"07","abstract":[{"text":"Alignment of OCS, CS2, and I2 molecules embedded in helium nanodroplets is measured as a function\r\nof time following rotational excitation by a nonresonant, comparatively weak ps laser pulse. The distinct\r\npeaks in the power spectra, obtained by Fourier analysis, are used to determine the rotational, B, and\r\ncentrifugal distortion, D, constants. For OCS, B and D match the values known from IR spectroscopy. For\r\nCS2 and I2, they are the first experimental results reported. The alignment dynamics calculated from the\r\ngas-phase rotational Schrödinger equation, using the experimental in-droplet B and D values, agree in\r\ndetail with the measurement for all three molecules. The rotational spectroscopy technique for molecules in\r\nhelium droplets introduced here should apply to a range of molecules and complexes.","lang":"eng"}],"oa_version":"Preprint","external_id":{"isi":["000544526900006"],"arxiv":["2006.02694"]},"article_processing_charge":"No","author":[{"last_name":"Chatterley","full_name":"Chatterley, Adam S.","first_name":"Adam S."},{"last_name":"Christiansen","full_name":"Christiansen, Lars","first_name":"Lars"},{"full_name":"Schouder, Constant A.","last_name":"Schouder","first_name":"Constant A."},{"full_name":"Jørgensen, Anders V.","last_name":"Jørgensen","first_name":"Anders V."},{"full_name":"Shepperson, Benjamin","last_name":"Shepperson","first_name":"Benjamin"},{"first_name":"Igor","id":"339C7E5A-F248-11E8-B48F-1D18A9856A87","last_name":"Cherepanov","full_name":"Cherepanov, Igor"},{"first_name":"Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","last_name":"Bighin","orcid":"0000-0001-8823-9777","full_name":"Bighin, Giacomo"},{"full_name":"Zillich, Robert E.","last_name":"Zillich","first_name":"Robert E."},{"id":"37CB05FA-F248-11E8-B48F-1D18A9856A87","first_name":"Mikhail","last_name":"Lemeshko","orcid":"0000-0002-6990-7802","full_name":"Lemeshko, Mikhail"},{"first_name":"Henrik","last_name":"Stapelfeldt","full_name":"Stapelfeldt, Henrik"}],"title":"Rotational coherence spectroscopy of molecules in Helium nanodroplets: Reconciling the time and the frequency domains","citation":{"ista":"Chatterley AS, Christiansen L, Schouder CA, Jørgensen AV, Shepperson B, Cherepanov I, Bighin G, Zillich RE, Lemeshko M, Stapelfeldt H. 2020. Rotational coherence spectroscopy of molecules in Helium nanodroplets: Reconciling the time and the frequency domains. Physical Review Letters. 125(1), 013001.","chicago":"Chatterley, Adam S., Lars Christiansen, Constant A. Schouder, Anders V. Jørgensen, Benjamin Shepperson, Igor Cherepanov, Giacomo Bighin, Robert E. Zillich, Mikhail Lemeshko, and Henrik Stapelfeldt. “Rotational Coherence Spectroscopy of Molecules in Helium Nanodroplets: Reconciling the Time and the Frequency Domains.” Physical Review Letters. American Physical Society, 2020. https://doi.org/10.1103/PhysRevLett.125.013001.","apa":"Chatterley, A. S., Christiansen, L., Schouder, C. A., Jørgensen, A. V., Shepperson, B., Cherepanov, I., … Stapelfeldt, H. (2020). Rotational coherence spectroscopy of molecules in Helium nanodroplets: Reconciling the time and the frequency domains. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.125.013001","ama":"Chatterley AS, Christiansen L, Schouder CA, et al. Rotational coherence spectroscopy of molecules in Helium nanodroplets: Reconciling the time and the frequency domains. Physical Review Letters. 2020;125(1). doi:10.1103/PhysRevLett.125.013001","ieee":"A. S. Chatterley et al., “Rotational coherence spectroscopy of molecules in Helium nanodroplets: Reconciling the time and the frequency domains,” Physical Review Letters, vol. 125, no. 1. American Physical Society, 2020.","short":"A.S. Chatterley, L. Christiansen, C.A. Schouder, A.V. Jørgensen, B. Shepperson, I. Cherepanov, G. Bighin, R.E. Zillich, M. Lemeshko, H. Stapelfeldt, Physical Review Letters 125 (2020).","mla":"Chatterley, Adam S., et al. “Rotational Coherence Spectroscopy of Molecules in Helium Nanodroplets: Reconciling the Time and the Frequency Domains.” Physical Review Letters, vol. 125, no. 1, 013001, American Physical Society, 2020, doi:10.1103/PhysRevLett.125.013001."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","project":[{"grant_number":"P29902","name":"Quantum rotations in the presence of a many-body environment","call_identifier":"FWF","_id":"26031614-B435-11E9-9278-68D0E5697425"},{"_id":"2688CF98-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"801770","name":"Angulon: physics and applications of a new quasiparticle"},{"grant_number":"M02641","name":"A path-integral approach to composite impurities","_id":"26986C82-B435-11E9-9278-68D0E5697425","call_identifier":"FWF"},{"_id":"2564DBCA-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"International IST Doctoral Program","grant_number":"665385"}],"article_number":"013001","date_created":"2020-07-26T22:01:02Z","doi":"10.1103/PhysRevLett.125.013001","date_published":"2020-07-03T00:00:00Z","year":"2020","isi":1,"publication":"Physical Review Letters","day":"03","oa":1,"quality_controlled":"1","publisher":"American Physical Society","acknowledgement":"H. S. acknowledges support from the European Research Council-AdG (Project No. 320459, DropletControl)\r\nand from The Villum Foundation through a Villum Investigator Grant No. 25886. M. L. acknowledges support\r\nby the Austrian Science Fund (FWF), under Project No. P29902-N27, and by the European Research Council\r\n(ERC) Starting Grant No. 801770 (ANGULON). G. B. acknowledges support from the Austrian Science Fund\r\n(FWF), under Project No. M2641-N27. I. C. acknowledges support by the European Union’s Horizon 2020 research and\r\ninnovation programme under the Marie Skłodowska-Curie Grant Agreement No. 665385. Computational resources for\r\nthe PIMC simulations were provided by the division for scientific computing at the Johannes Kepler University."},{"ec_funded":1,"related_material":{"record":[{"status":"public","id":"8958","relation":"dissertation_contains"}]},"volume":152,"issue":"16","language":[{"iso":"eng"}],"publication_status":"published","publication_identifier":{"issn":["0021-9606"],"eissn":["1089-7690"]},"intvolume":" 152","month":"04","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1912.02658"}],"oa_version":"Preprint","abstract":[{"lang":"eng","text":"Inspired by the possibility to experimentally manipulate and enhance chemical reactivity in helium nanodroplets, we investigate the effective interaction and the resulting correlations between two diatomic molecules immersed in a bath of bosons. By analogy with the bipolaron, we introduce the biangulon quasiparticle describing two rotating molecules that align with respect to each other due to the effective attractive interaction mediated by the excitations of the bath. We study this system in different parameter regimes and apply several theoretical approaches to describe its properties. Using a Born–Oppenheimer approximation, we investigate the dependence of the effective intermolecular interaction on the rotational state of the two molecules. In the strong-coupling regime, a product-state ansatz shows that the molecules tend to have a strong alignment in the ground state. To investigate the system in the weak-coupling regime, we apply a one-phonon excitation variational ansatz, which allows us to access the energy spectrum. In comparison to the angulon quasiparticle, the biangulon shows shifted angulon instabilities and an additional spectral instability, where resonant angular momentum transfer between the molecules and the bath takes place. These features are proposed as an experimentally observable signature for the formation of the biangulon quasiparticle. Finally, by using products of single angulon and bare impurity wave functions as basis states, we introduce a diagonalization scheme that allows us to describe the transition from two separated angulons to a biangulon as a function of the distance between the two molecules."}],"department":[{"_id":"MiLe"},{"_id":"RoSe"}],"date_updated":"2023-09-07T13:16:42Z","keyword":["Physical and Theoretical Chemistry","General Physics and Astronomy"],"status":"public","article_type":"original","type":"journal_article","_id":"8587","date_created":"2020-09-30T10:33:17Z","date_published":"2020-04-27T00:00:00Z","doi":"10.1063/1.5144759","publication":"The Journal of Chemical Physics","day":"27","year":"2020","isi":1,"oa":1,"quality_controlled":"1","publisher":"AIP Publishing","acknowledgement":"We are grateful to Areg Ghazaryan for valuable discussions. M.L. acknowledges support from the Austrian Science Fund (FWF) under Project No. P29902-N27 and from the European Research Council (ERC) Starting Grant No. 801770 (ANGULON). G.B. acknowledges support from the Austrian Science Fund (FWF) under Project No. M2461-N27. A.D. acknowledges funding from the European Union’s Horizon 2020 research and innovation programme under the European Research Council (ERC) Grant Agreement No. 694227 and under the Marie Sklodowska-Curie Grant Agreement No. 836146. R.S. was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy – EXC-2111 – 390814868.","title":"Intermolecular forces and correlations mediated by a phonon bath","external_id":{"isi":["000530448300001"],"arxiv":["1912.02658"]},"article_processing_charge":"No","author":[{"last_name":"Li","full_name":"Li, Xiang","first_name":"Xiang","id":"4B7E523C-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Enderalp","id":"38CB71F6-F248-11E8-B48F-1D18A9856A87","last_name":"Yakaboylu","orcid":"0000-0001-5973-0874","full_name":"Yakaboylu, Enderalp"},{"first_name":"Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","last_name":"Bighin","orcid":"0000-0001-8823-9777","full_name":"Bighin, Giacomo"},{"first_name":"Richard","full_name":"Schmidt, Richard","last_name":"Schmidt"},{"last_name":"Lemeshko","orcid":"0000-0002-6990-7802","full_name":"Lemeshko, Mikhail","first_name":"Mikhail","id":"37CB05FA-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Andreas","id":"4DA65CD0-F248-11E8-B48F-1D18A9856A87","full_name":"Deuchert, Andreas","orcid":"0000-0003-3146-6746","last_name":"Deuchert"}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"ista":"Li X, Yakaboylu E, Bighin G, Schmidt R, Lemeshko M, Deuchert A. 2020. Intermolecular forces and correlations mediated by a phonon bath. The Journal of Chemical Physics. 152(16), 164302.","chicago":"Li, Xiang, Enderalp Yakaboylu, Giacomo Bighin, Richard Schmidt, Mikhail Lemeshko, and Andreas Deuchert. “Intermolecular Forces and Correlations Mediated by a Phonon Bath.” The Journal of Chemical Physics. AIP Publishing, 2020. https://doi.org/10.1063/1.5144759.","ama":"Li X, Yakaboylu E, Bighin G, Schmidt R, Lemeshko M, Deuchert A. Intermolecular forces and correlations mediated by a phonon bath. The Journal of Chemical Physics. 2020;152(16). doi:10.1063/1.5144759","apa":"Li, X., Yakaboylu, E., Bighin, G., Schmidt, R., Lemeshko, M., & Deuchert, A. (2020). Intermolecular forces and correlations mediated by a phonon bath. The Journal of Chemical Physics. AIP Publishing. https://doi.org/10.1063/1.5144759","ieee":"X. Li, E. Yakaboylu, G. Bighin, R. Schmidt, M. Lemeshko, and A. Deuchert, “Intermolecular forces and correlations mediated by a phonon bath,” The Journal of Chemical Physics, vol. 152, no. 16. AIP Publishing, 2020.","short":"X. Li, E. Yakaboylu, G. Bighin, R. Schmidt, M. Lemeshko, A. Deuchert, The Journal of Chemical Physics 152 (2020).","mla":"Li, Xiang, et al. “Intermolecular Forces and Correlations Mediated by a Phonon Bath.” The Journal of Chemical Physics, vol. 152, no. 16, 164302, AIP Publishing, 2020, doi:10.1063/1.5144759."},"project":[{"grant_number":"P29902","name":"Quantum rotations in the presence of a many-body environment","_id":"26031614-B435-11E9-9278-68D0E5697425","call_identifier":"FWF"},{"grant_number":"801770","name":"Angulon: physics and applications of a new quasiparticle","_id":"2688CF98-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"},{"grant_number":"M02641","name":"A path-integral approach to composite impurities","call_identifier":"FWF","_id":"26986C82-B435-11E9-9278-68D0E5697425"},{"name":"Analysis of quantum many-body systems","grant_number":"694227","call_identifier":"H2020","_id":"25C6DC12-B435-11E9-9278-68D0E5697425"}],"article_number":"164302"},{"article_number":"093026","project":[{"name":"International IST Doctoral Program","grant_number":"665385","call_identifier":"H2020","_id":"2564DBCA-B435-11E9-9278-68D0E5697425"},{"name":"Analytic and machine learning approaches to composite quantum impurities","grant_number":"25681","_id":"05A235A0-7A3F-11EA-A408-12923DDC885E"},{"call_identifier":"FWF","_id":"26986C82-B435-11E9-9278-68D0E5697425","grant_number":"M02641","name":"A path-integral approach to composite impurities"}],"citation":{"ista":"Rzadkowski W, Defenu N, Chiacchiera S, Trombettoni A, Bighin G. 2020. Detecting composite orders in layered models via machine learning. New Journal of Physics. 22(9), 093026.","chicago":"Rzadkowski, Wojciech, N Defenu, S Chiacchiera, A Trombettoni, and Giacomo Bighin. “Detecting Composite Orders in Layered Models via Machine Learning.” New Journal of Physics. IOP Publishing, 2020. https://doi.org/10.1088/1367-2630/abae44.","ieee":"W. Rzadkowski, N. Defenu, S. Chiacchiera, A. Trombettoni, and G. Bighin, “Detecting composite orders in layered models via machine learning,” New Journal of Physics, vol. 22, no. 9. IOP Publishing, 2020.","short":"W. Rzadkowski, N. Defenu, S. Chiacchiera, A. Trombettoni, G. Bighin, New Journal of Physics 22 (2020).","ama":"Rzadkowski W, Defenu N, Chiacchiera S, Trombettoni A, Bighin G. Detecting composite orders in layered models via machine learning. New Journal of Physics. 2020;22(9). doi:10.1088/1367-2630/abae44","apa":"Rzadkowski, W., Defenu, N., Chiacchiera, S., Trombettoni, A., & Bighin, G. (2020). Detecting composite orders in layered models via machine learning. New Journal of Physics. IOP Publishing. https://doi.org/10.1088/1367-2630/abae44","mla":"Rzadkowski, Wojciech, et al. “Detecting Composite Orders in Layered Models via Machine Learning.” New Journal of Physics, vol. 22, no. 9, 093026, IOP Publishing, 2020, doi:10.1088/1367-2630/abae44."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","author":[{"id":"48C55298-F248-11E8-B48F-1D18A9856A87","first_name":"Wojciech","last_name":"Rzadkowski","orcid":"0000-0002-1106-4419","full_name":"Rzadkowski, Wojciech"},{"full_name":"Defenu, N","last_name":"Defenu","first_name":"N"},{"full_name":"Chiacchiera, S","last_name":"Chiacchiera","first_name":"S"},{"first_name":"A","full_name":"Trombettoni, A","last_name":"Trombettoni"},{"orcid":"0000-0001-8823-9777","full_name":"Bighin, Giacomo","last_name":"Bighin","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","first_name":"Giacomo"}],"external_id":{"isi":["000573298000001"]},"article_processing_charge":"No","title":"Detecting composite orders in layered models via machine learning","acknowledgement":"We thank Gesualdo Delfino, Michele Fabrizio, Piero Ferrarese, Robert Konik, Christoph Lampert and Mikhail Lemeshko for stimulating discussions at various stages of this work. WR has received funding from the EU Horizon 2020 program under the Marie Skłodowska-Curie Grant Agreement No. 665385 and is a recipient of a DOC Fellowship of the Austrian Academy of Sciences. GB acknowledges support from the Austrian Science Fund (FWF), under project No. M2641-N27. ND acknowledges support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via Collaborative Research Center SFB 1225 (ISOQUANT)--project-id 273811115--and under Germany's Excellence Strategy 'EXC-2181/1-390900948' (the Heidelberg STRUCTURES Excellence Cluster).","publisher":"IOP Publishing","quality_controlled":"1","oa":1,"has_accepted_license":"1","isi":1,"year":"2020","day":"01","publication":"New Journal of Physics","date_published":"2020-09-01T00:00:00Z","doi":"10.1088/1367-2630/abae44","date_created":"2020-10-11T22:01:14Z","_id":"8644","type":"journal_article","article_type":"original","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"status":"public","date_updated":"2023-09-07T13:44:16Z","ddc":["530"],"file_date_updated":"2020-10-12T12:18:47Z","department":[{"_id":"MiLe"}],"abstract":[{"lang":"eng","text":"Determining the phase diagram of systems consisting of smaller subsystems 'connected' via a tunable coupling is a challenging task relevant for a variety of physical settings. A general question is whether new phases, not present in the uncoupled limit, may arise. We use machine learning and a suitable quasidistance between different points of the phase diagram to study layered spin models, in which the spin variables constituting each of the uncoupled systems (to which we refer as layers) are coupled to each other via an interlayer coupling. In such systems, in general, composite order parameters involving spins of different layers may emerge as a consequence of the interlayer coupling. We focus on the layered Ising and Ashkin–Teller models as a paradigmatic case study, determining their phase diagram via the application of a machine learning algorithm to the Monte Carlo data. Remarkably our technique is able to correctly characterize all the system phases also in the case of hidden order parameters, i.e. order parameters whose expression in terms of the microscopic configurations would require additional preprocessing of the data fed to the algorithm. We correctly retrieve the three known phases of the Ashkin–Teller model with ferromagnetic couplings, including the phase described by a composite order parameter. For the bilayer and trilayer Ising models the phases we find are only the ferromagnetic and the paramagnetic ones. Within the approach we introduce, owing to the construction of convolutional neural networks, naturally suitable for layered image-like data with arbitrary number of layers, no preprocessing of the Monte Carlo data is needed, also with regard to its spatial structure. The physical meaning of our results is discussed and compared with analytical data, where available. Yet, the method can be used without any a priori knowledge of the phases one seeks to find and can be applied to other models and structures."}],"oa_version":"Published Version","scopus_import":"1","month":"09","intvolume":" 22","publication_identifier":{"issn":["13672630"]},"publication_status":"published","file":[{"file_size":2725143,"date_updated":"2020-10-12T12:18:47Z","creator":"dernst","file_name":"2020_NewJournalPhysics_Rzdkowski.pdf","date_created":"2020-10-12T12:18:47Z","content_type":"application/pdf","relation":"main_file","access_level":"open_access","success":1,"file_id":"8650","checksum":"c9238fff422e7a957c3a0d559f756b3a"}],"language":[{"iso":"eng"}],"related_material":{"record":[{"status":"public","id":"10759","relation":"dissertation_contains"}]},"issue":"9","volume":22,"ec_funded":1},{"citation":{"apa":"Bighin, G., Defenu, N., Nándori, I., Salasnich, L., & Trombettoni, A. (2019). Berezinskii-Kosterlitz-Thouless paired phase in coupled XY models. Physical Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.123.100601","ama":"Bighin G, Defenu N, Nándori I, Salasnich L, Trombettoni A. Berezinskii-Kosterlitz-Thouless paired phase in coupled XY models. Physical Review Letters. 2019;123(10). doi:10.1103/physrevlett.123.100601","short":"G. Bighin, N. Defenu, I. Nándori, L. Salasnich, A. Trombettoni, Physical Review Letters 123 (2019).","ieee":"G. Bighin, N. Defenu, I. Nándori, L. Salasnich, and A. Trombettoni, “Berezinskii-Kosterlitz-Thouless paired phase in coupled XY models,” Physical Review Letters, vol. 123, no. 10. American Physical Society, 2019.","mla":"Bighin, Giacomo, et al. “Berezinskii-Kosterlitz-Thouless Paired Phase in Coupled XY Models.” Physical Review Letters, vol. 123, no. 10, 100601, American Physical Society, 2019, doi:10.1103/physrevlett.123.100601.","ista":"Bighin G, Defenu N, Nándori I, Salasnich L, Trombettoni A. 2019. Berezinskii-Kosterlitz-Thouless paired phase in coupled XY models. Physical Review Letters. 123(10), 100601.","chicago":"Bighin, Giacomo, Nicolò Defenu, István Nándori, Luca Salasnich, and Andrea Trombettoni. “Berezinskii-Kosterlitz-Thouless Paired Phase in Coupled XY Models.” Physical Review Letters. American Physical Society, 2019. https://doi.org/10.1103/physrevlett.123.100601."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","external_id":{"arxiv":["1907.06253"],"isi":["000483587200004"]},"article_processing_charge":"No","author":[{"id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","first_name":"Giacomo","full_name":"Bighin, Giacomo","orcid":"0000-0001-8823-9777","last_name":"Bighin"},{"first_name":"Nicolò","full_name":"Defenu, Nicolò","last_name":"Defenu"},{"first_name":"István","last_name":"Nándori","full_name":"Nándori, István"},{"first_name":"Luca","full_name":"Salasnich, Luca","last_name":"Salasnich"},{"full_name":"Trombettoni, Andrea","last_name":"Trombettoni","first_name":"Andrea"}],"title":"Berezinskii-Kosterlitz-Thouless paired phase in coupled XY models","article_number":"100601","project":[{"call_identifier":"FWF","_id":"26986C82-B435-11E9-9278-68D0E5697425","name":"A path-integral approach to composite impurities","grant_number":"M02641"}],"year":"2019","isi":1,"publication":"Physical Review Letters","day":"06","date_created":"2019-10-14T06:31:13Z","doi":"10.1103/physrevlett.123.100601","date_published":"2019-09-06T00:00:00Z","acknowledgement":"We thank S. Chiacchiera, G. Delfino, N. Dupuis, T. Enss, M. Fabrizio and G. Gori for many stimulating discussions.\r\nG.B. acknowledges support from the Austrian Science Fund (FWF), under project No. M2461-N27. N.D. acknowledges\r\nsupport from Deutsche Forschungsgemeinschaft (DFG) under Germany’s Excellence Strategy EXC-2181/1 - 390900948 (the Heidelberg STRUCTURES Excellence Cluster) and from the DFG Collaborative Research Centre “SFB 1225 ISOQUANT”. Support from the CNR/MTA Italy-Hungary 2019-2021 Joint Project “Strongly interacting systems in confined geometries” is gratefully acknowledged.","oa":1,"publisher":"American Physical Society","quality_controlled":"1","date_updated":"2023-08-30T06:57:53Z","department":[{"_id":"MiLe"}],"_id":"6940","article_type":"original","type":"journal_article","status":"public","publication_status":"published","publication_identifier":{"eissn":["1079-7114"],"issn":["0031-9007"]},"language":[{"iso":"eng"}],"issue":"10","related_material":{"link":[{"relation":"press_release","url":"https://ist.ac.at/en/news/new-form-of-magnetism-found/","description":"News auf IST Website"}]},"volume":123,"abstract":[{"text":"We study the effect of a linear tunneling coupling between two-dimensional systems, each separately\r\nexhibiting the topological Berezinskii-Kosterlitz-Thouless (BKT) transition. In the uncoupled limit, there\r\nare two phases: one where the one-body correlation functions are algebraically decaying and the other with\r\nexponential decay. When the linear coupling is turned on, a third BKT-paired phase emerges, in which one-body correlations are exponentially decaying, while two-body correlation functions exhibit power-law\r\ndecay. We perform numerical simulations in the paradigmatic case of two coupled XY models at finite\r\ntemperature, finding evidences that for any finite value of the interlayer coupling, the BKT-paired phase is\r\npresent. We provide a picture of the phase diagram using a renormalization group approach.","lang":"eng"}],"oa_version":"Preprint","main_file_link":[{"url":"https://arxiv.org/abs/1907.06253","open_access":"1"}],"scopus_import":"1","intvolume":" 123","month":"09"},{"date_published":"2019-01-18T00:00:00Z","doi":"10.1080/00268976.2019.1567852","date_created":"2019-01-27T22:59:10Z","isi":1,"has_accepted_license":"1","year":"2019","day":"18","publication":"Molecular Physics","quality_controlled":"1","publisher":"Taylor and Francis","oa":1,"author":[{"last_name":"Li","full_name":"Li, Xiang","first_name":"Xiang","id":"4B7E523C-F248-11E8-B48F-1D18A9856A87"},{"orcid":"0000-0001-8823-9777","full_name":"Bighin, Giacomo","last_name":"Bighin","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","first_name":"Giacomo"},{"last_name":"Yakaboylu","orcid":"0000-0001-5973-0874","full_name":"Yakaboylu, Enderalp","first_name":"Enderalp","id":"38CB71F6-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Mikhail","id":"37CB05FA-F248-11E8-B48F-1D18A9856A87","last_name":"Lemeshko","full_name":"Lemeshko, Mikhail","orcid":"0000-0002-6990-7802"}],"article_processing_charge":"No","external_id":{"isi":["000474641400008"]},"title":"Variational approaches to quantum impurities: from the Fröhlich polaron to the angulon","citation":{"short":"X. Li, G. Bighin, E. Yakaboylu, M. Lemeshko, Molecular Physics (2019).","ieee":"X. Li, G. Bighin, E. Yakaboylu, and M. Lemeshko, “Variational approaches to quantum impurities: from the Fröhlich polaron to the angulon,” Molecular Physics. Taylor and Francis, 2019.","ama":"Li X, Bighin G, Yakaboylu E, Lemeshko M. Variational approaches to quantum impurities: from the Fröhlich polaron to the angulon. Molecular Physics. 2019. doi:10.1080/00268976.2019.1567852","apa":"Li, X., Bighin, G., Yakaboylu, E., & Lemeshko, M. (2019). Variational approaches to quantum impurities: from the Fröhlich polaron to the angulon. Molecular Physics. Taylor and Francis. https://doi.org/10.1080/00268976.2019.1567852","mla":"Li, Xiang, et al. “Variational Approaches to Quantum Impurities: From the Fröhlich Polaron to the Angulon.” Molecular Physics, Taylor and Francis, 2019, doi:10.1080/00268976.2019.1567852.","ista":"Li X, Bighin G, Yakaboylu E, Lemeshko M. 2019. Variational approaches to quantum impurities: from the Fröhlich polaron to the angulon. Molecular Physics.","chicago":"Li, Xiang, Giacomo Bighin, Enderalp Yakaboylu, and Mikhail Lemeshko. “Variational Approaches to Quantum Impurities: From the Fröhlich Polaron to the Angulon.” Molecular Physics. Taylor and Francis, 2019. https://doi.org/10.1080/00268976.2019.1567852."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","project":[{"_id":"26031614-B435-11E9-9278-68D0E5697425","call_identifier":"FWF","name":"Quantum rotations in the presence of a many-body environment","grant_number":"P29902"},{"name":"International IST Postdoc Fellowship Programme","grant_number":"291734","_id":"25681D80-B435-11E9-9278-68D0E5697425","call_identifier":"FP7"}],"related_material":{"record":[{"status":"public","id":"8958","relation":"dissertation_contains"}]},"ec_funded":1,"publication_identifier":{"issn":["00268976"]},"publication_status":"published","file":[{"access_level":"open_access","relation":"main_file","content_type":"application/pdf","file_id":"5896","checksum":"178964744b636a6f036372f4f090a657","creator":"dernst","date_updated":"2020-07-14T12:47:13Z","file_size":1309966,"date_created":"2019-01-29T08:32:57Z","file_name":"2019_MolecularPhysics_Li.pdf"}],"language":[{"iso":"eng"}],"scopus_import":"1","month":"01","abstract":[{"text":"Problems involving quantum impurities, in which one or a few particles are interacting with a macroscopic environment, represent a pervasive paradigm, spanning across atomic, molecular, and condensed-matter physics. In this paper we introduce new variational approaches to quantum impurities and apply them to the Fröhlich polaron–a quasiparticle formed out of an electron (or other point-like impurity) in a polar medium, and to the angulon–a quasiparticle formed out of a rotating molecule in a bosonic bath. We benchmark these approaches against established theories, evaluating their accuracy as a function of the impurity-bath coupling.","lang":"eng"}],"oa_version":"Published Version","file_date_updated":"2020-07-14T12:47:13Z","department":[{"_id":"MiLe"}],"date_updated":"2023-09-07T13:16:42Z","ddc":["530"],"type":"journal_article","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"status":"public","_id":"5886"},{"date_updated":"2023-09-18T08:09:59Z","department":[{"_id":"MiLe"}],"_id":"420","status":"public","type":"journal_article","language":[{"iso":"eng"}],"publication_status":"published","issue":"17","volume":32,"oa_version":"Preprint","abstract":[{"text":"We analyze the theoretical derivation of the beyond-mean-field equation of state for two-dimensional gas of dilute, ultracold alkali-metal atoms in the Bardeen–Cooper–Schrieffer (BCS) to Bose–Einstein condensate (BEC) crossover. We show that at zero temperature our theory — considering Gaussian fluctuations on top of the mean-field equation of state — is in very good agreement with experimental data. Subsequently, we investigate the superfluid density at finite temperature and its renormalization due to the proliferation of vortex–antivortex pairs. By doing so, we determine the Berezinskii–Kosterlitz–Thouless (BKT) critical temperature — at which the renormalized superfluid density jumps to zero — as a function of the inter-atomic potential strength. We find that the Nelson–Kosterlitz criterion overestimates the BKT temperature with respect to the renormalization group equations, this effect being particularly relevant in the intermediate regime of the crossover.","lang":"eng"}],"month":"07","intvolume":" 32","scopus_import":"1","main_file_link":[{"url":"https://arxiv.org/abs/1710.11171","open_access":"1"}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"chicago":"Bighin, Giacomo, and Luca Salasnich. “Renormalization of the Superfluid Density in the Two-Dimensional BCS-BEC Crossover.” International Journal of Modern Physics B. World Scientific Publishing, 2018. https://doi.org/10.1142/S0217979218400222.","ista":"Bighin G, Salasnich L. 2018. Renormalization of the superfluid density in the two-dimensional BCS-BEC crossover. International Journal of Modern Physics B. 32(17), 1840022.","mla":"Bighin, Giacomo, and Luca Salasnich. “Renormalization of the Superfluid Density in the Two-Dimensional BCS-BEC Crossover.” International Journal of Modern Physics B, vol. 32, no. 17, World Scientific Publishing, 2018, p. 1840022, doi:10.1142/S0217979218400222.","short":"G. Bighin, L. Salasnich, International Journal of Modern Physics B 32 (2018) 1840022.","ieee":"G. Bighin and L. Salasnich, “Renormalization of the superfluid density in the two-dimensional BCS-BEC crossover,” International Journal of Modern Physics B, vol. 32, no. 17. World Scientific Publishing, p. 1840022, 2018.","apa":"Bighin, G., & Salasnich, L. (2018). Renormalization of the superfluid density in the two-dimensional BCS-BEC crossover. International Journal of Modern Physics B. World Scientific Publishing. https://doi.org/10.1142/S0217979218400222","ama":"Bighin G, Salasnich L. Renormalization of the superfluid density in the two-dimensional BCS-BEC crossover. International Journal of Modern Physics B. 2018;32(17):1840022. doi:10.1142/S0217979218400222"},"title":"Renormalization of the superfluid density in the two-dimensional BCS-BEC crossover","author":[{"orcid":"0000-0001-8823-9777","full_name":"Bighin, Giacomo","last_name":"Bighin","first_name":"Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Luca","full_name":"Salasnich, Luca","last_name":"Salasnich"}],"publist_id":"7402","external_id":{"isi":["000438217300007"]},"article_processing_charge":"No","day":"10","publication":"International Journal of Modern Physics B","isi":1,"year":"2018","date_published":"2018-07-10T00:00:00Z","doi":"10.1142/S0217979218400222","date_created":"2018-12-11T11:46:22Z","page":"1840022","quality_controlled":"1","publisher":"World Scientific Publishing","oa":1},{"department":[{"_id":"MiLe"}],"date_updated":"2024-02-28T13:15:09Z","type":"journal_article","status":"public","_id":"6339","volume":121,"related_material":{"link":[{"description":"News on IST Homepage","url":"https://ist.ac.at/en/news/description-of-rotating-molecules-made-easy/","relation":"press_release"}]},"issue":"16","publication_status":"published","language":[{"iso":"eng"}],"scopus_import":"1","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1803.07990"}],"month":"10","intvolume":" 121","abstract":[{"lang":"eng","text":"We introduce a diagrammatic Monte Carlo approach to angular momentum properties of quantum many-particle systems possessing a macroscopic number of degrees of freedom. The treatment is based on a diagrammatic expansion that merges the usual Feynman diagrams with the angular momentum diagrams known from atomic and nuclear structure theory, thereby incorporating the non-Abelian algebra inherent to quantum rotations. Our approach is applicable at arbitrary coupling, is free of systematic errors and of finite-size effects, and naturally provides access to the impurity Green function. We exemplify the technique by obtaining an all-coupling solution of the angulon model; however, the method is quite general and can be applied to a broad variety of systems in which particles exchange quantum angular momentum with their many-body environment."}],"oa_version":"Preprint","author":[{"first_name":"Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-8823-9777","full_name":"Bighin, Giacomo","last_name":"Bighin"},{"first_name":"Timur","full_name":"Tscherbul, Timur","last_name":"Tscherbul"},{"last_name":"Lemeshko","full_name":"Lemeshko, Mikhail","orcid":"0000-0002-6990-7802","id":"37CB05FA-F248-11E8-B48F-1D18A9856A87","first_name":"Mikhail"}],"article_processing_charge":"No","external_id":{"isi":["000447468400008"],"arxiv":["1803.07990"]},"title":"Diagrammatic Monte Carlo approach to angular momentum in quantum many-particle systems","citation":{"mla":"Bighin, Giacomo, et al. “Diagrammatic Monte Carlo Approach to Angular Momentum in Quantum Many-Particle Systems.” Physical Review Letters, vol. 121, no. 16, 165301, American Physical Society, 2018, doi:10.1103/physrevlett.121.165301.","short":"G. Bighin, T. Tscherbul, M. Lemeshko, Physical Review Letters 121 (2018).","ieee":"G. Bighin, T. Tscherbul, and M. Lemeshko, “Diagrammatic Monte Carlo approach to angular momentum in quantum many-particle systems,” Physical Review Letters, vol. 121, no. 16. American Physical Society, 2018.","ama":"Bighin G, Tscherbul T, Lemeshko M. Diagrammatic Monte Carlo approach to angular momentum in quantum many-particle systems. Physical Review Letters. 2018;121(16). doi:10.1103/physrevlett.121.165301","apa":"Bighin, G., Tscherbul, T., & Lemeshko, M. (2018). Diagrammatic Monte Carlo approach to angular momentum in quantum many-particle systems. Physical Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.121.165301","chicago":"Bighin, Giacomo, Timur Tscherbul, and Mikhail Lemeshko. “Diagrammatic Monte Carlo Approach to Angular Momentum in Quantum Many-Particle Systems.” Physical Review Letters. American Physical Society, 2018. https://doi.org/10.1103/physrevlett.121.165301.","ista":"Bighin G, Tscherbul T, Lemeshko M. 2018. Diagrammatic Monte Carlo approach to angular momentum in quantum many-particle systems. Physical Review Letters. 121(16), 165301."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","project":[{"call_identifier":"FWF","_id":"26031614-B435-11E9-9278-68D0E5697425","grant_number":"P29902","name":"Quantum rotations in the presence of a many-body environment"}],"article_number":"165301","date_published":"2018-10-16T00:00:00Z","doi":"10.1103/physrevlett.121.165301","date_created":"2019-04-17T10:53:38Z","isi":1,"year":"2018","day":"16","publication":"Physical Review Letters","publisher":"American Physical Society","quality_controlled":"1","oa":1},{"_id":"417","status":"public","type":"journal_article","date_updated":"2024-02-28T13:14:53Z","department":[{"_id":"MiLe"}],"oa_version":"Preprint","abstract":[{"lang":"eng","text":"We introduce a Diagrammatic Monte Carlo (DiagMC) approach to complex molecular impurities with rotational degrees of freedom interacting with a many-particle environment. The treatment is based on the diagrammatic expansion that merges the usual Feynman diagrams with the angular momentum diagrams known from atomic and nuclear structure theory, thereby incorporating the non-Abelian algebra inherent to quantum rotations. Our approach works at arbitrary coupling, is free of systematic errors and of finite size effects, and naturally provides access to the impurity Green function. We exemplify the technique by obtaining an all-coupling solution of the angulon model, however, the method is quite general and can be applied to a broad variety of quantum impurities possessing angular momentum degrees of freedom. "}],"month":"10","intvolume":" 121","scopus_import":"1","main_file_link":[{"url":"https://arxiv.org/abs/1803.07990","open_access":"1"}],"language":[{"iso":"eng"}],"publication_status":"published","issue":"16","volume":121,"article_number":"165301","project":[{"call_identifier":"FWF","_id":"26031614-B435-11E9-9278-68D0E5697425","grant_number":"P29902","name":"Quantum rotations in the presence of a many-body environment"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"mla":"Bighin, Giacomo, et al. “Diagrammatic Monte Carlo Approach to Rotating Molecular Impurities.” Physical Review Letters, vol. 121, no. 16, 165301, American Physical Society, 2018, doi:10.1103/PhysRevLett.121.165301.","ama":"Bighin G, Tscherbul T, Lemeshko M. Diagrammatic Monte Carlo approach to rotating molecular impurities. Physical Review Letters. 2018;121(16). doi:10.1103/PhysRevLett.121.165301","apa":"Bighin, G., Tscherbul, T., & Lemeshko, M. (2018). Diagrammatic Monte Carlo approach to rotating molecular impurities. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.121.165301","ieee":"G. Bighin, T. Tscherbul, and M. Lemeshko, “Diagrammatic Monte Carlo approach to rotating molecular impurities,” Physical Review Letters, vol. 121, no. 16. American Physical Society, 2018.","short":"G. Bighin, T. Tscherbul, M. Lemeshko, Physical Review Letters 121 (2018).","chicago":"Bighin, Giacomo, Timur Tscherbul, and Mikhail Lemeshko. “Diagrammatic Monte Carlo Approach to Rotating Molecular Impurities.” Physical Review Letters. American Physical Society, 2018. https://doi.org/10.1103/PhysRevLett.121.165301.","ista":"Bighin G, Tscherbul T, Lemeshko M. 2018. Diagrammatic Monte Carlo approach to rotating molecular impurities. Physical Review Letters. 121(16), 165301."},"title":"Diagrammatic Monte Carlo approach to rotating molecular impurities","author":[{"full_name":"Bighin, Giacomo","orcid":"0000-0001-8823-9777","last_name":"Bighin","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","first_name":"Giacomo"},{"first_name":"Timur","full_name":"Tscherbul, Timur","last_name":"Tscherbul"},{"first_name":"Mikhail","id":"37CB05FA-F248-11E8-B48F-1D18A9856A87","last_name":"Lemeshko","full_name":"Lemeshko, Mikhail","orcid":"0000-0002-6990-7802"}],"publist_id":"8025","article_processing_charge":"No","external_id":{"arxiv":["1803.07990"]},"publisher":"American Physical Society","quality_controlled":"1","oa":1,"day":"16","publication":"Physical Review Letters","year":"2018","date_published":"2018-10-16T00:00:00Z","doi":"10.1103/PhysRevLett.121.165301","date_created":"2018-12-11T11:46:22Z"},{"_id":"1015","type":"journal_article","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"status":"public","pubrep_id":"809","date_updated":"2023-09-22T09:43:10Z","ddc":["539"],"file_date_updated":"2018-12-12T10:12:32Z","department":[{"_id":"MiLe"}],"abstract":[{"text":"Vortices are commonly observed in the context of classical hydrodynamics: from whirlpools after stirring the coffee in a cup to a violent atmospheric phenomenon such as a tornado, all classical vortices are characterized by an arbitrary circulation value of the local velocity field. On the other hand the appearance of vortices with quantized circulation represents one of the fundamental signatures of macroscopic quantum phenomena. In two-dimensional superfluids quantized vortices play a key role in determining finite-temperature properties, as the superfluid phase and the normal state are separated by a vortex unbinding transition, the Berezinskii-Kosterlitz-Thouless transition. Very recent experiments with two-dimensional superfluid fermions motivate the present work: we present theoretical results based on the renormalization group showing that the universal jump of the superfluid density and the critical temperature crucially depend on the interaction strength, providing a strong benchmark for forthcoming investigations.","lang":"eng"}],"oa_version":"Published Version","scopus_import":"1","month":"04","intvolume":" 7","publication_identifier":{"issn":["20452322"]},"publication_status":"published","file":[{"file_id":"4950","content_type":"application/pdf","relation":"main_file","access_level":"open_access","file_name":"IST-2017-809-v1+1_srep45702.pdf","date_created":"2018-12-12T10:12:32Z","file_size":478289,"date_updated":"2018-12-12T10:12:32Z","creator":"system"}],"language":[{"iso":"eng"}],"volume":7,"article_number":"45702","citation":{"mla":"Bighin, Giacomo, and Luca Salasnich. “Vortices and Antivortices in Two-Dimensional Ultracold Fermi Gases.” Scientific Reports, vol. 7, 45702, Nature Publishing Group, 2017, doi:10.1038/srep45702.","apa":"Bighin, G., & Salasnich, L. (2017). Vortices and antivortices in two-dimensional ultracold Fermi gases. Scientific Reports. Nature Publishing Group. https://doi.org/10.1038/srep45702","ama":"Bighin G, Salasnich L. Vortices and antivortices in two-dimensional ultracold Fermi gases. Scientific Reports. 2017;7. doi:10.1038/srep45702","ieee":"G. Bighin and L. Salasnich, “Vortices and antivortices in two-dimensional ultracold Fermi gases,” Scientific Reports, vol. 7. Nature Publishing Group, 2017.","short":"G. Bighin, L. Salasnich, Scientific Reports 7 (2017).","chicago":"Bighin, Giacomo, and Luca Salasnich. “Vortices and Antivortices in Two-Dimensional Ultracold Fermi Gases.” Scientific Reports. Nature Publishing Group, 2017. https://doi.org/10.1038/srep45702.","ista":"Bighin G, Salasnich L. 2017. Vortices and antivortices in two-dimensional ultracold Fermi gases. Scientific Reports. 7, 45702."},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","author":[{"full_name":"Bighin, Giacomo","orcid":"0000-0001-8823-9777","last_name":"Bighin","first_name":"Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Salasnich","full_name":"Salasnich, Luca","first_name":"Luca"}],"publist_id":"6380","external_id":{"isi":["000398148100001"]},"article_processing_charge":"No","title":"Vortices and antivortices in two-dimensional ultracold Fermi gases","publisher":"Nature Publishing Group","quality_controlled":"1","oa":1,"isi":1,"has_accepted_license":"1","year":"2017","day":"04","publication":"Scientific Reports","doi":"10.1038/srep45702","date_published":"2017-04-04T00:00:00Z","date_created":"2018-12-11T11:49:42Z"},{"publication":"Physical Review B - Condensed Matter and Materials Physics","day":"07","year":"2017","isi":1,"date_created":"2018-12-11T11:49:36Z","doi":"10.1103/PhysRevB.96.085410","date_published":"2017-08-07T00:00:00Z","oa":1,"publisher":"American Physical Society","quality_controlled":"1","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"ista":"Bighin G, Lemeshko M. 2017. Diagrammatic approach to orbital quantum impurities interacting with a many-particle environment. Physical Review B - Condensed Matter and Materials Physics. 96(8), 085410.","chicago":"Bighin, Giacomo, and Mikhail Lemeshko. “Diagrammatic Approach to Orbital Quantum Impurities Interacting with a Many-Particle Environment.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2017. https://doi.org/10.1103/PhysRevB.96.085410.","apa":"Bighin, G., & Lemeshko, M. (2017). Diagrammatic approach to orbital quantum impurities interacting with a many-particle environment. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.96.085410","ama":"Bighin G, Lemeshko M. Diagrammatic approach to orbital quantum impurities interacting with a many-particle environment. Physical Review B - Condensed Matter and Materials Physics. 2017;96(8). doi:10.1103/PhysRevB.96.085410","short":"G. Bighin, M. Lemeshko, Physical Review B - Condensed Matter and Materials Physics 96 (2017).","ieee":"G. Bighin and M. Lemeshko, “Diagrammatic approach to orbital quantum impurities interacting with a many-particle environment,” Physical Review B - Condensed Matter and Materials Physics, vol. 96, no. 8. American Physical Society, 2017.","mla":"Bighin, Giacomo, and Mikhail Lemeshko. “Diagrammatic Approach to Orbital Quantum Impurities Interacting with a Many-Particle Environment.” Physical Review B - Condensed Matter and Materials Physics, vol. 96, no. 8, 085410, American Physical Society, 2017, doi:10.1103/PhysRevB.96.085410."},"title":"Diagrammatic approach to orbital quantum impurities interacting with a many-particle environment","external_id":{"isi":["000407017100009"]},"article_processing_charge":"No","author":[{"orcid":"0000-0001-8823-9777","full_name":"Bighin, Giacomo","last_name":"Bighin","first_name":"Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Lemeshko, Mikhail","orcid":"0000-0002-6990-7802","last_name":"Lemeshko","first_name":"Mikhail","id":"37CB05FA-F248-11E8-B48F-1D18A9856A87"}],"publist_id":"6404","article_number":"085410","project":[{"call_identifier":"FWF","_id":"26031614-B435-11E9-9278-68D0E5697425","grant_number":"P29902","name":"Quantum rotations in the presence of a many-body environment"}],"language":[{"iso":"eng"}],"publication_status":"published","publication_identifier":{"issn":["24699950"]},"issue":"8","volume":96,"oa_version":"Submitted Version","abstract":[{"text":"Recently it was shown that an impurity exchanging orbital angular momentum with a surrounding bath can be described in terms of the angulon quasiparticle [Phys. Rev. Lett. 118, 095301 (2017)]. The angulon consists of a quantum rotor dressed by a many-particle field of boson excitations, and can be formed out of, for example, a molecule or a nonspherical atom in superfluid helium, or out of an electron coupled to lattice phonons or a Bose condensate. Here we develop an approach to the angulon based on the path-integral formalism, which sets the ground for a systematic, perturbative treatment of the angulon problem. The resulting perturbation series can be interpreted in terms of Feynman diagrams, from which, in turn, one can derive a set of diagrammatic rules. These rules extend the machinery of the graphical theory of angular momentum - well known from theoretical atomic spectroscopy - to the case where an environment with an infinite number of degrees of freedom is present. In particular, we show that each diagram can be interpreted as a 'skeleton', which enforces angular momentum conservation, dressed by an additional many-body contribution. This connection between the angulon theory and the graphical theory of angular momentum is particularly important as it allows to systematically and substantially simplify the analytical representation of each diagram. In order to exemplify the technique, we calculate the 1- and 2-loop contributions to the angulon self-energy, the spectral function, and the quasiparticle weight. The diagrammatic theory we develop paves the way to investigate next-to-leading order quantities in a more compact way compared to the variational approaches.","lang":"eng"}],"intvolume":" 96","month":"08","main_file_link":[{"url":"https://arxiv.org/abs/1704.02616","open_access":"1"}],"scopus_import":"1","date_updated":"2023-09-22T09:53:17Z","department":[{"_id":"MiLe"}],"_id":"995","status":"public","type":"journal_article"}]