{"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).","status":"public","file":[{"content_type":"application/pdf","file_id":"12361","file_size":843723,"file_name":"2022_Symmetry_Salsnich.pdf","date_created":"2023-01-24T10:56:12Z","checksum":"9b6bd0e484834dd76d7b26e3c5fba8bd","creator":"dernst","relation":"main_file","date_updated":"2023-01-24T10:56:12Z","access_level":"open_access","success":1}],"quality_controlled":"1","date_updated":"2023-08-09T10:13:17Z","language":[{"iso":"eng"}],"month":"10","intvolume":"        14","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","external_id":{"isi":["000875039200001"]},"oa":1,"date_published":"2022-10-17T00:00:00Z","author":[{"full_name":"Salasnich, Luca","last_name":"Salasnich","first_name":"Luca"},{"last_name":"Cappellaro","full_name":"Cappellaro, Alberto","first_name":"Alberto","orcid":"0000-0001-6110-2359","id":"9d13b3cb-30a2-11eb-80dc-f772505e8660"},{"first_name":"Koichiro","full_name":"Furutani, Koichiro","last_name":"Furutani"},{"last_name":"Tononi","full_name":"Tononi, Andrea","first_name":"Andrea"},{"full_name":"Bighin, Giacomo","last_name":"Bighin","first_name":"Giacomo","orcid":"0000-0001-8823-9777","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87"}],"ddc":["530"],"title":"First and second sound in two-dimensional bosonic and fermionic superfluids","has_accepted_license":"1","_id":"12154","citation":{"ieee":"L. Salasnich, A. Cappellaro, K. Furutani, A. Tononi, and G. Bighin, “First and second sound in two-dimensional bosonic and fermionic superfluids,” <i>Symmetry</i>, vol. 14, no. 10. MDPI, 2022.","ama":"Salasnich L, Cappellaro A, Furutani K, Tononi A, Bighin G. First and second sound in two-dimensional bosonic and fermionic superfluids. <i>Symmetry</i>. 2022;14(10). doi:<a href=\"https://doi.org/10.3390/sym14102182\">10.3390/sym14102182</a>","apa":"Salasnich, L., Cappellaro, A., Furutani, K., Tononi, A., &#38; Bighin, G. (2022). First and second sound in two-dimensional bosonic and fermionic superfluids. <i>Symmetry</i>. MDPI. <a href=\"https://doi.org/10.3390/sym14102182\">https://doi.org/10.3390/sym14102182</a>","chicago":"Salasnich, Luca, Alberto Cappellaro, Koichiro Furutani, Andrea Tononi, and Giacomo Bighin. “First and Second Sound in Two-Dimensional Bosonic and Fermionic Superfluids.” <i>Symmetry</i>. MDPI, 2022. <a href=\"https://doi.org/10.3390/sym14102182\">https://doi.org/10.3390/sym14102182</a>.","mla":"Salasnich, Luca, et al. “First and Second Sound in Two-Dimensional Bosonic and Fermionic Superfluids.” <i>Symmetry</i>, vol. 14, no. 10, 2182, MDPI, 2022, doi:<a href=\"https://doi.org/10.3390/sym14102182\">10.3390/sym14102182</a>.","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.","short":"L. Salasnich, A. Cappellaro, K. Furutani, A. Tononi, G. Bighin, Symmetry 14 (2022)."},"date_created":"2023-01-12T12:08:31Z","year":"2022","department":[{"_id":"MiLe"}],"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"}],"doi":"10.3390/sym14102182","keyword":["Physics and Astronomy (miscellaneous)","General Mathematics","Chemistry (miscellaneous)","Computer Science (miscellaneous)"],"publication":"Symmetry","article_number":"2182","file_date_updated":"2023-01-24T10:56:12Z","isi":1,"article_processing_charge":"Yes","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png"},"day":"17","type":"journal_article","oa_version":"Published Version","scopus_import":"1","publication_status":"published","article_type":"original","issue":"10","volume":14,"publisher":"MDPI","publication_identifier":{"issn":["2073-8994"]}}