--- _id: '5983' abstract: - lang: eng text: We study a quantum impurity possessing both translational and internal rotational degrees of freedom interacting with a bosonic bath. Such a system corresponds to a “rotating polaron,” which can be used to model, e.g., a rotating molecule immersed in an ultracold Bose gas or superfluid helium. We derive the Hamiltonian of the rotating polaron and study its spectrum in the weak- and strong-coupling regimes using a combination of variational, diagrammatic, and mean-field approaches. We reveal how the coupling between linear and angular momenta affects stable quasiparticle states, and demonstrate that internal rotation leads to an enhanced self-localization in the translational degrees of freedom. article_number: '224506' article_processing_charge: No author: - first_name: Enderalp full_name: Yakaboylu, Enderalp id: 38CB71F6-F248-11E8-B48F-1D18A9856A87 last_name: Yakaboylu orcid: 0000-0001-5973-0874 - first_name: Bikashkali full_name: Midya, Bikashkali id: 456187FC-F248-11E8-B48F-1D18A9856A87 last_name: Midya - first_name: Andreas full_name: Deuchert, Andreas id: 4DA65CD0-F248-11E8-B48F-1D18A9856A87 last_name: Deuchert orcid: 0000-0003-3146-6746 - first_name: Nikolai K full_name: Leopold, Nikolai K id: 4BC40BEC-F248-11E8-B48F-1D18A9856A87 last_name: Leopold orcid: 0000-0002-0495-6822 - first_name: Mikhail full_name: Lemeshko, Mikhail id: 37CB05FA-F248-11E8-B48F-1D18A9856A87 last_name: Lemeshko orcid: 0000-0002-6990-7802 citation: ama: 'Yakaboylu E, Midya B, Deuchert A, Leopold NK, Lemeshko M. Theory of the rotating polaron: Spectrum and self-localization. Physical Review B. 2018;98(22). doi:10.1103/physrevb.98.224506' apa: 'Yakaboylu, E., Midya, B., Deuchert, A., Leopold, N. K., & Lemeshko, M. (2018). Theory of the rotating polaron: Spectrum and self-localization. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.98.224506' chicago: 'Yakaboylu, Enderalp, Bikashkali Midya, Andreas Deuchert, Nikolai K Leopold, and Mikhail Lemeshko. “Theory of the Rotating Polaron: Spectrum and Self-Localization.” Physical Review B. American Physical Society, 2018. https://doi.org/10.1103/physrevb.98.224506.' ieee: 'E. Yakaboylu, B. Midya, A. Deuchert, N. K. Leopold, and M. Lemeshko, “Theory of the rotating polaron: Spectrum and self-localization,” Physical Review B, vol. 98, no. 22. American Physical Society, 2018.' ista: 'Yakaboylu E, Midya B, Deuchert A, Leopold NK, Lemeshko M. 2018. Theory of the rotating polaron: Spectrum and self-localization. Physical Review B. 98(22), 224506.' mla: 'Yakaboylu, Enderalp, et al. “Theory of the Rotating Polaron: Spectrum and Self-Localization.” Physical Review B, vol. 98, no. 22, 224506, American Physical Society, 2018, doi:10.1103/physrevb.98.224506.' short: E. Yakaboylu, B. Midya, A. Deuchert, N.K. Leopold, M. Lemeshko, Physical Review B 98 (2018). date_created: 2019-02-14T10:37:09Z date_published: 2018-12-12T00:00:00Z date_updated: 2023-09-19T14:29:03Z day: '12' department: - _id: MiLe - _id: RoSe doi: 10.1103/physrevb.98.224506 ec_funded: 1 external_id: arxiv: - '1809.01204' isi: - '000452992700008' intvolume: ' 98' isi: 1 issue: '22' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1809.01204 month: '12' oa: 1 oa_version: Preprint project: - _id: 25681D80-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '291734' name: International IST Postdoc Fellowship Programme - _id: 25C6DC12-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '694227' name: Analysis of quantum many-body systems publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: 'Theory of the rotating polaron: Spectrum and self-localization' type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 98 year: '2018' ... --- _id: '435' abstract: - lang: eng text: It is shown that two fundamentally different phenomena, the bound states in continuum and the spectral singularity (or time-reversed spectral singularity), can occur simultaneously. This can be achieved in a rectangular core dielectric waveguide with an embedded active (or absorbing) layer. In such a system a two-dimensional bound state in a continuum is created in the plane of a waveguide cross section, and it is emitted or absorbed along the waveguide core. The idea can be used for experimental implementation of a laser or a coherent-perfect-absorber for a photonic bound state that resides in a continuous spectrum. acknowledgement: 'Seventh Framework Programme (FP7) People: Marie-Curie Actions (PEOPLE) (291734). B. M. acknowledges the financial support by the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme (FP7/ 2007-2013) under REA.' article_processing_charge: No author: - first_name: Bikashkali full_name: Midya, Bikashkali id: 456187FC-F248-11E8-B48F-1D18A9856A87 last_name: Midya - first_name: Vladimir full_name: Konotop, Vladimir last_name: Konotop citation: ama: Midya B, Konotop V. Coherent-perfect-absorber and laser for bound states in a continuum. Optics Letters. 2018;43(3):607-610. doi:10.1364/OL.43.000607 apa: Midya, B., & Konotop, V. (2018). Coherent-perfect-absorber and laser for bound states in a continuum. Optics Letters. Optica  Publishing Group. https://doi.org/10.1364/OL.43.000607 chicago: Midya, Bikashkali, and Vladimir Konotop. “Coherent-Perfect-Absorber and Laser for Bound States in a Continuum.” Optics Letters. Optica  Publishing Group, 2018. https://doi.org/10.1364/OL.43.000607. ieee: B. Midya and V. Konotop, “Coherent-perfect-absorber and laser for bound states in a continuum,” Optics Letters, vol. 43, no. 3. Optica  Publishing Group, pp. 607–610, 2018. ista: Midya B, Konotop V. 2018. Coherent-perfect-absorber and laser for bound states in a continuum. Optics Letters. 43(3), 607–610. mla: Midya, Bikashkali, and Vladimir Konotop. “Coherent-Perfect-Absorber and Laser for Bound States in a Continuum.” Optics Letters, vol. 43, no. 3, Optica  Publishing Group, 2018, pp. 607–10, doi:10.1364/OL.43.000607. short: B. Midya, V. Konotop, Optics Letters 43 (2018) 607–610. date_created: 2018-12-11T11:46:27Z date_published: 2018-02-01T00:00:00Z date_updated: 2023-10-17T12:15:06Z day: '01' department: - _id: MiLe doi: 10.1364/OL.43.000607 ec_funded: 1 external_id: arxiv: - '1711.01986' isi: - '000423776600066' intvolume: ' 43' isi: 1 issue: '3' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1711.01986 month: '02' oa: 1 oa_version: Preprint page: 607 - 610 project: - _id: 25681D80-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '291734' name: International IST Postdoc Fellowship Programme publication: Optics Letters publication_status: published publisher: Optica Publishing Group publist_id: '7388' quality_controlled: '1' scopus_import: '1' status: public title: Coherent-perfect-absorber and laser for bound states in a continuum type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 43 year: '2018' ... --- _id: '939' abstract: - lang: eng text: We reveal the existence of continuous families of guided single-mode solitons in planar waveguides with weakly nonlinear active core and absorbing boundaries. Stable propagation of TE and TM-polarized solitons is accompanied by attenuation of all other modes, i.e., the waveguide features properties of conservative and dissipative systems. If the linear spectrum of the waveguide possesses exceptional points, which occurs in the case of TM polarization, an originally focusing (defocusing) material nonlinearity may become effectively defocusing (focusing). This occurs due to the geometric phase of the carried eigenmode when the surface impedance encircles the exceptional point. In its turn, the change of the effective nonlinearity ensures the existence of dark (bright) solitons in spite of focusing (defocusing) Kerr nonlinearity of the core. The existence of an exceptional point can also result in anomalous enhancement of the effective nonlinearity. In terms of practical applications, the nonlinearity of the reported waveguide can be manipulated by controlling the properties of the absorbing cladding. article_number: '033905' article_processing_charge: No author: - first_name: Bikashkali full_name: Midya, Bikashkali id: 456187FC-F248-11E8-B48F-1D18A9856A87 last_name: Midya - first_name: Vladimir full_name: Konotop, Vladimir last_name: Konotop citation: ama: 'Midya B, Konotop V. Waveguides with absorbing boundaries: Nonlinearity controlled by an exceptional point and solitons. Physical Review Letters. 2017;119(3). doi:10.1103/PhysRevLett.119.033905' apa: 'Midya, B., & Konotop, V. (2017). Waveguides with absorbing boundaries: Nonlinearity controlled by an exceptional point and solitons. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.119.033905' chicago: 'Midya, Bikashkali, and Vladimir Konotop. “Waveguides with Absorbing Boundaries: Nonlinearity Controlled by an Exceptional Point and Solitons.” Physical Review Letters. American Physical Society, 2017. https://doi.org/10.1103/PhysRevLett.119.033905.' ieee: 'B. Midya and V. Konotop, “Waveguides with absorbing boundaries: Nonlinearity controlled by an exceptional point and solitons,” Physical Review Letters, vol. 119, no. 3. American Physical Society, 2017.' ista: 'Midya B, Konotop V. 2017. Waveguides with absorbing boundaries: Nonlinearity controlled by an exceptional point and solitons. Physical Review Letters. 119(3), 033905.' mla: 'Midya, Bikashkali, and Vladimir Konotop. “Waveguides with Absorbing Boundaries: Nonlinearity Controlled by an Exceptional Point and Solitons.” Physical Review Letters, vol. 119, no. 3, 033905, American Physical Society, 2017, doi:10.1103/PhysRevLett.119.033905.' short: B. Midya, V. Konotop, Physical Review Letters 119 (2017). date_created: 2018-12-11T11:49:18Z date_published: 2017-07-18T00:00:00Z date_updated: 2023-09-26T15:39:46Z day: '18' department: - _id: MiLe doi: 10.1103/PhysRevLett.119.033905 ec_funded: 1 external_id: isi: - '000405718200012' intvolume: ' 119' isi: 1 issue: '3' language: - iso: eng main_file_link: - open_access: '1' url: 'https://arxiv.org/abs/1706.04085 ' month: '07' oa: 1 oa_version: Submitted Version project: - _id: 25681D80-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '291734' name: International IST Postdoc Fellowship Programme publication: Physical Review Letters publication_identifier: issn: - '00319007' publication_status: published publisher: American Physical Society publist_id: '6481' quality_controlled: '1' scopus_import: '1' status: public title: 'Waveguides with absorbing boundaries: Nonlinearity controlled by an exceptional point and solitons' type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 119 year: '2017' ... --- _id: '1286' abstract: - lang: eng text: We use recently developed angulon theory [R. Schmidt and M. Lemeshko, Phys. Rev. Lett. 114, 203001 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.203001] to study the rotational spectrum of a cyanide molecular anion immersed into Bose-Einstein condensates of rubidium and strontium. Based on ab initio potential energy surfaces, we provide a detailed study of the rotational Lamb shift and many-body-induced fine structure which arise due to dressing of molecular rotation by a field of phonon excitations. We demonstrate that the magnitude of these effects is large enough in order to be observed in modern experiments on cold molecular ions. Furthermore, we introduce a novel method to construct pseudopotentials starting from the ab initio potential energy surfaces, which provides a means to obtain effective coupling constants for low-energy polaron models. acknowledgement: The work was supported by the NSF through a grant for the Institute for Theoretical Atomic, Molecular, and Optical Physics at Harvard University and the Smithsonian Astrophysical Observatory. B.M. acknowledges financial support received from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under REA grant agreement No. 291734. M.T. acknowledges support from the EU Marie Curie COFUND action (ICFOnest), the EU Grants ERC AdG OSYRIS, FP7 SIQS and EQuaM, FETPROACT QUIC, the Spanish Ministry Grants FOQUS (FIS2013-46768-P) and Severo Ochoa (SEV-2015-0522), Generalitat de Catalunya (SGR 874), Fundacio Cellex, the National Science Centre (2015/19/D/ST4/02173), and the PL-Grid Infrastructure. article_number: '041601' author: - first_name: Bikashkali full_name: Midya, Bikashkali id: 456187FC-F248-11E8-B48F-1D18A9856A87 last_name: Midya - first_name: Michał full_name: Tomza, Michał last_name: Tomza - first_name: Richard full_name: Schmidt, Richard last_name: Schmidt - first_name: Mikhail full_name: Lemeshko, Mikhail id: 37CB05FA-F248-11E8-B48F-1D18A9856A87 last_name: Lemeshko orcid: 0000-0002-6990-7802 citation: ama: Midya B, Tomza M, Schmidt R, Lemeshko M. Rotation of cold molecular ions inside a Bose-Einstein condensate. Physical Review A - Atomic, Molecular, and Optical Physics. 2016;94(4). doi:10.1103/PhysRevA.94.041601 apa: Midya, B., Tomza, M., Schmidt, R., & Lemeshko, M. (2016). Rotation of cold molecular ions inside a Bose-Einstein condensate. Physical Review A - Atomic, Molecular, and Optical Physics. American Physical Society. https://doi.org/10.1103/PhysRevA.94.041601 chicago: Midya, Bikashkali, Michał Tomza, Richard Schmidt, and Mikhail Lemeshko. “Rotation of Cold Molecular Ions inside a Bose-Einstein Condensate.” Physical Review A - Atomic, Molecular, and Optical Physics. American Physical Society, 2016. https://doi.org/10.1103/PhysRevA.94.041601. ieee: B. Midya, M. Tomza, R. Schmidt, and M. Lemeshko, “Rotation of cold molecular ions inside a Bose-Einstein condensate,” Physical Review A - Atomic, Molecular, and Optical Physics, vol. 94, no. 4. American Physical Society, 2016. ista: Midya B, Tomza M, Schmidt R, Lemeshko M. 2016. Rotation of cold molecular ions inside a Bose-Einstein condensate. Physical Review A - Atomic, Molecular, and Optical Physics. 94(4), 041601. mla: Midya, Bikashkali, et al. “Rotation of Cold Molecular Ions inside a Bose-Einstein Condensate.” Physical Review A - Atomic, Molecular, and Optical Physics, vol. 94, no. 4, 041601, American Physical Society, 2016, doi:10.1103/PhysRevA.94.041601. short: B. Midya, M. Tomza, R. Schmidt, M. Lemeshko, Physical Review A - Atomic, Molecular, and Optical Physics 94 (2016). date_created: 2018-12-11T11:51:09Z date_published: 2016-10-13T00:00:00Z date_updated: 2021-01-12T06:49:37Z day: '13' department: - _id: MiLe doi: 10.1103/PhysRevA.94.041601 ec_funded: 1 intvolume: ' 94' issue: '4' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1607.06092 month: '10' oa: 1 oa_version: Preprint project: - _id: 25681D80-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '291734' name: International IST Postdoc Fellowship Programme publication: Physical Review A - Atomic, Molecular, and Optical Physics publication_status: published publisher: American Physical Society publist_id: '6030' quality_controlled: '1' scopus_import: 1 status: public title: Rotation of cold molecular ions inside a Bose-Einstein condensate type: journal_article user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87 volume: 94 year: '2016' ... --- _id: '1287' abstract: - lang: eng text: A planar waveguide with an impedance boundary, composed of nonperfect metallic plates, and with passive or active dielectric filling, is considered. We show the possibility of selective mode guiding and amplification when a homogeneous pump is added to the dielectric and analyze differences in TE and TM mode propagation. Such a non-conservative system is also shown to feature exceptional points for specific and experimentally tunable parameters, which are described for a particular case of transparent dielectric. acknowledgement: The research of B.M. is supported by the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme (FP7/2007-2013) under REA grant No. [291734]. article_processing_charge: No author: - first_name: Bikashkali full_name: Midya, Bikashkali id: 456187FC-F248-11E8-B48F-1D18A9856A87 last_name: Midya - first_name: Vladimir full_name: Konotop, Vladimir last_name: Konotop citation: ama: Midya B, Konotop V. Modes and exceptional points in waveguides with impedance boundary conditions. Optics Letters. 2016;41(20):4621-4624. doi:10.1364/OL.41.004621 apa: Midya, B., & Konotop, V. (2016). Modes and exceptional points in waveguides with impedance boundary conditions. Optics Letters. Optica Publishing Group. https://doi.org/10.1364/OL.41.004621 chicago: Midya, Bikashkali, and Vladimir Konotop. “Modes and Exceptional Points in Waveguides with Impedance Boundary Conditions.” Optics Letters. Optica Publishing Group, 2016. https://doi.org/10.1364/OL.41.004621. ieee: B. Midya and V. Konotop, “Modes and exceptional points in waveguides with impedance boundary conditions,” Optics Letters, vol. 41, no. 20. Optica Publishing Group, pp. 4621–4624, 2016. ista: Midya B, Konotop V. 2016. Modes and exceptional points in waveguides with impedance boundary conditions. Optics Letters. 41(20), 4621–4624. mla: Midya, Bikashkali, and Vladimir Konotop. “Modes and Exceptional Points in Waveguides with Impedance Boundary Conditions.” Optics Letters, vol. 41, no. 20, Optica Publishing Group, 2016, pp. 4621–24, doi:10.1364/OL.41.004621. short: B. Midya, V. Konotop, Optics Letters 41 (2016) 4621–4624. date_created: 2018-12-11T11:51:09Z date_published: 2016-10-15T00:00:00Z date_updated: 2023-10-17T12:16:24Z day: '15' department: - _id: MiLe doi: 10.1364/OL.41.004621 ec_funded: 1 intvolume: ' 41' issue: '20' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1609.02863 month: '10' oa: 1 oa_version: Preprint page: 4621 - 4624 project: - _id: 25681D80-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '291734' name: International IST Postdoc Fellowship Programme publication: Optics Letters publication_status: published publisher: Optica Publishing Group publist_id: '6029' quality_controlled: '1' scopus_import: '1' status: public title: Modes and exceptional points in waveguides with impedance boundary conditions type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 41 year: '2016' ...