{"publication_identifier":{"isbn":["9788961058063"]},"_id":"8044","date_created":"2020-06-29T07:59:35Z","oa_version":"Published Version","intvolume":"         3","publication":"Proceeding of the International Congress of Mathematicans","month":"08","oa":1,"title":"Structure of the excitation spectrum for many-body quantum systems","quality_controlled":"1","day":"01","scopus_import":1,"citation":{"ama":"Seiringer R. Structure of the excitation spectrum for many-body quantum systems. In: <i>Proceeding of the International Congress of Mathematicans</i>. Vol 3. Kyung Moon SA; 2014:1175-1194.","ista":"Seiringer R. 2014. Structure of the excitation spectrum for many-body quantum systems. Proceeding of the International Congress of Mathematicans. ICM: International Congress of Mathematicans vol. 3, 1175–1194.","short":"R. Seiringer, in:, Proceeding of the International Congress of Mathematicans, Kyung Moon SA, 2014, pp. 1175–1194.","apa":"Seiringer, R. (2014). Structure of the excitation spectrum for many-body quantum systems. In <i>Proceeding of the International Congress of Mathematicans</i> (Vol. 3, pp. 1175–1194). Seoul, South Korea: Kyung Moon SA.","chicago":"Seiringer, Robert. “Structure of the Excitation Spectrum for Many-Body Quantum Systems.” In <i>Proceeding of the International Congress of Mathematicans</i>, 3:1175–94. Kyung Moon SA, 2014.","ieee":"R. Seiringer, “Structure of the excitation spectrum for many-body quantum systems,” in <i>Proceeding of the International Congress of Mathematicans</i>, Seoul, South Korea, 2014, vol. 3, pp. 1175–1194.","mla":"Seiringer, Robert. “Structure of the Excitation Spectrum for Many-Body Quantum Systems.” <i>Proceeding of the International Congress of Mathematicans</i>, vol. 3, Kyung Moon SA, 2014, pp. 1175–94."},"author":[{"first_name":"Robert","orcid":"0000-0002-6781-0521","id":"4AFD0470-F248-11E8-B48F-1D18A9856A87","full_name":"Seiringer, Robert","last_name":"Seiringer"}],"department":[{"_id":"RoSe"}],"conference":{"name":"ICM: International Congress of Mathematicans","location":"Seoul, South Korea","start_date":"2014-08-13","end_date":"2014-08-21"},"page":"1175-1194","abstract":[{"text":"Many questions concerning models in quantum mechanics require a detailed analysis of the spectrum of the corresponding Hamiltonian, a linear operator on a suitable Hilbert space. Of particular relevance for an understanding of the low-temperature properties of a system is the structure of the excitation spectrum, which is the part of the spectrum close to the spectral bottom. We present recent progress on this question for bosonic many-body quantum systems with weak two-body interactions. Such system are currently of great interest, due to their experimental realization in ultra-cold atomic gases. We investigate the accuracy of the Bogoliubov approximations, which predicts that the low-energy spectrum is made up of sums of elementary excitations, with linear dispersion law at low momentum. The latter property is crucial for the superfluid behavior the system.","lang":"eng"}],"type":"conference","language":[{"iso":"eng"}],"date_updated":"2021-01-12T08:16:43Z","volume":3,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Kyung Moon SA","article_processing_charge":"No","status":"public","main_file_link":[{"url":"http://www.icm2014.org/en/vod/proceedings.html","open_access":"1"}],"publication_status":"published","year":"2014","date_published":"2014-08-01T00:00:00Z"}