[{"date_published":"2021-06-01T00:00:00Z","main_file_link":[{"url":"https://arxiv.org/abs/2009.06491","open_access":"1"}],"oa":1,"publication_status":"published","intvolume":"       103","citation":{"apa":"Tononi, A., Cappellaro, A., Bighin, G., &#38; Salasnich, L. (2021). Propagation of first and second sound in a two-dimensional Fermi superfluid. <i>Physical Review A</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevA.103.L061303\">https://doi.org/10.1103/PhysRevA.103.L061303</a>","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.","mla":"Tononi, A., et al. “Propagation of First and Second Sound in a Two-Dimensional Fermi Superfluid.” <i>Physical Review A</i>, vol. 103, no. 6, L061303, American Physical Society, 2021, doi:<a href=\"https://doi.org/10.1103/PhysRevA.103.L061303\">10.1103/PhysRevA.103.L061303</a>.","ama":"Tononi A, Cappellaro A, Bighin G, Salasnich L. Propagation of first and second sound in a two-dimensional Fermi superfluid. <i>Physical Review A</i>. 2021;103(6). doi:<a href=\"https://doi.org/10.1103/PhysRevA.103.L061303\">10.1103/PhysRevA.103.L061303</a>","short":"A. Tononi, A. Cappellaro, G. Bighin, L. Salasnich, Physical Review A 103 (2021).","chicago":"Tononi, A., Alberto Cappellaro, Giacomo Bighin, and L. Salasnich. “Propagation of First and Second Sound in a Two-Dimensional Fermi Superfluid.” <i>Physical Review A</i>. American Physical Society, 2021. <a href=\"https://doi.org/10.1103/PhysRevA.103.L061303\">https://doi.org/10.1103/PhysRevA.103.L061303</a>.","ieee":"A. Tononi, A. Cappellaro, G. Bighin, and L. Salasnich, “Propagation of first and second sound in a two-dimensional Fermi superfluid,” <i>Physical Review A</i>, vol. 103, no. 6. American Physical Society, 2021."},"external_id":{"isi":["000662296700014"],"arxiv":["2009.06491"]},"status":"public","volume":103,"date_created":"2021-06-27T22:01:49Z","month":"06","type":"journal_article","oa_version":"Preprint","abstract":[{"lang":"eng","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."}],"date_updated":"2023-08-10T13:37:25Z","_id":"9606","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.","year":"2021","doi":"10.1103/PhysRevA.103.L061303","quality_controlled":"1","publication_identifier":{"eissn":["24699934"],"issn":["24699926"]},"isi":1,"issue":"6","language":[{"iso":"eng"}],"article_number":"L061303","title":"Propagation of first and second sound in a two-dimensional Fermi superfluid","arxiv":1,"author":[{"first_name":"A.","last_name":"Tononi","full_name":"Tononi, A."},{"id":"9d13b3cb-30a2-11eb-80dc-f772505e8660","orcid":"0000-0001-6110-2359","full_name":"Cappellaro, Alberto","last_name":"Cappellaro","first_name":"Alberto"},{"last_name":"Bighin","first_name":"Giacomo","full_name":"Bighin, Giacomo","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-8823-9777"},{"full_name":"Salasnich, L.","last_name":"Salasnich","first_name":"L."}],"day":"01","publication":"Physical Review A","article_type":"letter_note","article_processing_charge":"No","scopus_import":"1","publisher":"American Physical Society","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","department":[{"_id":"MiLe"}]},{"publication_identifier":{"eissn":["24699934"],"issn":["24699926"]},"doi":"10.1103/PhysRevA.102.012224","quality_controlled":"1","isi":1,"language":[{"iso":"eng"}],"issue":"1","author":[{"full_name":"Wu, Yunfan","first_name":"Yunfan","last_name":"Wu"},{"full_name":"Krishnakumar, Rajiv","last_name":"Krishnakumar","first_name":"Rajiv"},{"full_name":"Martínez-Rincón, Julián","last_name":"Martínez-Rincón","first_name":"Julián"},{"last_name":"Malia","first_name":"Benjamin K.","full_name":"Malia, Benjamin K."},{"last_name":"Hosten","first_name":"Onur","full_name":"Hosten, Onur","orcid":"0000-0002-2031-204X","id":"4C02D85E-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Mark A.","last_name":"Kasevich","full_name":"Kasevich, Mark A."}],"day":"30","title":"Retrieval of cavity-generated atomic spin squeezing after free-space release","arxiv":1,"article_number":"012224","publisher":"American Physical Society","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","department":[{"_id":"OnHo"}],"publication":"Physical Review A","scopus_import":"1","article_processing_charge":"No","article_type":"original","publication_status":"published","oa":1,"date_published":"2020-07-30T00:00:00Z","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1912.08334"}],"external_id":{"isi":["000555104200011"],"arxiv":["1912.08334"]},"status":"public","intvolume":"       102","citation":{"ama":"Wu Y, Krishnakumar R, Martínez-Rincón J, Malia BK, Hosten O, Kasevich MA. Retrieval of cavity-generated atomic spin squeezing after free-space release. <i>Physical Review A</i>. 2020;102(1). doi:<a href=\"https://doi.org/10.1103/PhysRevA.102.012224\">10.1103/PhysRevA.102.012224</a>","apa":"Wu, Y., Krishnakumar, R., Martínez-Rincón, J., Malia, B. K., Hosten, O., &#38; Kasevich, M. A. (2020). Retrieval of cavity-generated atomic spin squeezing after free-space release. <i>Physical Review A</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevA.102.012224\">https://doi.org/10.1103/PhysRevA.102.012224</a>","mla":"Wu, Yunfan, et al. “Retrieval of Cavity-Generated Atomic Spin Squeezing after Free-Space Release.” <i>Physical Review A</i>, vol. 102, no. 1, 012224, American Physical Society, 2020, doi:<a href=\"https://doi.org/10.1103/PhysRevA.102.012224\">10.1103/PhysRevA.102.012224</a>.","ista":"Wu Y, Krishnakumar R, Martínez-Rincón J, Malia BK, Hosten O, Kasevich MA. 2020. Retrieval of cavity-generated atomic spin squeezing after free-space release. Physical Review A. 102(1), 012224.","chicago":"Wu, Yunfan, Rajiv Krishnakumar, Julián Martínez-Rincón, Benjamin K. Malia, Onur Hosten, and Mark A. Kasevich. “Retrieval of Cavity-Generated Atomic Spin Squeezing after Free-Space Release.” <i>Physical Review A</i>. American Physical Society, 2020. <a href=\"https://doi.org/10.1103/PhysRevA.102.012224\">https://doi.org/10.1103/PhysRevA.102.012224</a>.","ieee":"Y. Wu, R. Krishnakumar, J. Martínez-Rincón, B. K. Malia, O. Hosten, and M. A. Kasevich, “Retrieval of cavity-generated atomic spin squeezing after free-space release,” <i>Physical Review A</i>, vol. 102, no. 1. American Physical Society, 2020.","short":"Y. Wu, R. Krishnakumar, J. Martínez-Rincón, B.K. Malia, O. Hosten, M.A. Kasevich, Physical Review A 102 (2020)."},"date_updated":"2024-02-28T13:11:28Z","abstract":[{"text":"We demonstrate that releasing atoms into free space from an optical lattice does not deteriorate cavity-generated spin squeezing for metrological purposes. In this work, an ensemble of 500000 spin-squeezed atoms in a high-finesse optical cavity with near-uniform atom-cavity coupling is prepared, released into free space, recaptured in the cavity, and probed. Up to ∼10 dB of metrologically relevant squeezing is retrieved for 700μs free-fall times, and decaying levels of squeezing are realized for up to 3 ms free-fall times. The degradation of squeezing results from loss of atom-cavity coupling homogeneity between the initial squeezed state generation and final collective state readout. A theoretical model is developed to quantify this degradation and this model is experimentally validated.","lang":"eng"}],"type":"journal_article","oa_version":"Preprint","month":"07","volume":102,"date_created":"2020-08-30T22:01:10Z","acknowledgement":"We thank N. Engelsen for comments on the manuscript. This work was supported by the Office of Naval Research, Vannevar Bush Faculty Fellowship, Department of Energy, and Defense Threat Reduction Agency. R.K. was partly supported by the AQT/INQNET program at Caltech.","year":"2020","_id":"8319"},{"arxiv":1,"title":"Coupled superfluidity of binary Bose mixtures in two dimensions","article_number":"063627","author":[{"full_name":"Karle, Volker","first_name":"Volker","last_name":"Karle"},{"last_name":"Defenu","first_name":"Nicolò","full_name":"Defenu, Nicolò"},{"full_name":"Enss, Tilman","last_name":"Enss","first_name":"Tilman"}],"day":"28","publication":"Physical Review A","article_processing_charge":"No","scopus_import":"1","publisher":"American Physical Society","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","department":[{"_id":"MiLe"}],"doi":"10.1103/PhysRevA.99.063627","quality_controlled":"1","publication_identifier":{"eissn":["24699934"],"issn":["24699926"]},"isi":1,"language":[{"iso":"eng"}],"issue":"6","volume":99,"date_created":"2019-07-14T21:59:17Z","date_updated":"2024-02-28T13:12:34Z","abstract":[{"lang":"eng","text":"We consider a two-component Bose gas in two dimensions at a low temperature with short-range repulsive interaction. In the coexistence phase where both components are superfluid, interspecies interactions induce a nondissipative drag between the two superfluid flows (Andreev-Bashkin effect). We show that this behavior leads to a modification of the usual Berezinskii-Kosterlitz-Thouless (BKT) transition in two dimensions. We extend the renormalization of the superfluid densities at finite temperature using the renormalization-group approach and find that the vortices of one component have a large influence on the superfluid properties of the other, mediated  by  the  nondissipative  drag.  The  extended  BKT  flow  equations  indicate  that  the  occurrence  of  the vortex unbinding transition in one of the components can induce the breakdown of superfluidity also in the other, leading to a locking phenomenon for the critical temperatures of the two gases."}],"type":"journal_article","oa_version":"Preprint","month":"06","_id":"6632","year":"2019","date_published":"2019-06-28T00:00:00Z","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1903.06759"}],"publication_status":"published","oa":1,"intvolume":"        99","citation":{"ieee":"V. Karle, N. Defenu, and T. Enss, “Coupled superfluidity of binary Bose mixtures in two dimensions,” <i>Physical Review A</i>, vol. 99, no. 6. American Physical Society, 2019.","chicago":"Karle, Volker, Nicolò Defenu, and Tilman Enss. “Coupled Superfluidity of Binary Bose Mixtures in Two Dimensions.” <i>Physical Review A</i>. American Physical Society, 2019. <a href=\"https://doi.org/10.1103/PhysRevA.99.063627\">https://doi.org/10.1103/PhysRevA.99.063627</a>.","short":"V. Karle, N. Defenu, T. Enss, Physical Review A 99 (2019).","ama":"Karle V, Defenu N, Enss T. Coupled superfluidity of binary Bose mixtures in two dimensions. <i>Physical Review A</i>. 2019;99(6). doi:<a href=\"https://doi.org/10.1103/PhysRevA.99.063627\">10.1103/PhysRevA.99.063627</a>","mla":"Karle, Volker, et al. “Coupled Superfluidity of Binary Bose Mixtures in Two Dimensions.” <i>Physical Review A</i>, vol. 99, no. 6, 063627, American Physical Society, 2019, doi:<a href=\"https://doi.org/10.1103/PhysRevA.99.063627\">10.1103/PhysRevA.99.063627</a>.","ista":"Karle V, Defenu N, Enss T. 2019. Coupled superfluidity of binary Bose mixtures in two dimensions. Physical Review A. 99(6), 063627.","apa":"Karle, V., Defenu, N., &#38; Enss, T. (2019). Coupled superfluidity of binary Bose mixtures in two dimensions. <i>Physical Review A</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevA.99.063627\">https://doi.org/10.1103/PhysRevA.99.063627</a>"},"status":"public","external_id":{"arxiv":["1903.06759"],"isi":["000473133600007"]}},{"day":"01","author":[{"last_name":"Klaiber","first_name":"Michael","full_name":"Klaiber, Michael"},{"full_name":"Daněk, Jiří","first_name":"Jiří","last_name":"Daněk"},{"last_name":"Yakaboylu","first_name":"Enderalp","orcid":"0000-0001-5973-0874","id":"38CB71F6-F248-11E8-B48F-1D18A9856A87","full_name":"Yakaboylu, Enderalp"},{"first_name":"Karen","last_name":"Hatsagortsyan","full_name":"Hatsagortsyan, Karen"},{"full_name":"Keitel, Christoph","last_name":"Keitel","first_name":"Christoph"}],"publist_id":"6305","title":"Strong-field ionization via a high-order Coulomb-corrected strong-field approximation","article_number":"023403","department":[{"_id":"MiLe"}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","publisher":"American Physical Society","ec_funded":1,"scopus_import":"1","article_processing_charge":"No","publication":" Physical Review A - Atomic, Molecular, and Optical Physics","publication_identifier":{"issn":["24699926"]},"quality_controlled":"1","doi":"10.1103/PhysRevA.95.023403","project":[{"grant_number":"291734","_id":"25681D80-B435-11E9-9278-68D0E5697425","call_identifier":"FP7","name":"International IST Postdoc Fellowship Programme"}],"language":[{"iso":"eng"}],"issue":"2","isi":1,"abstract":[{"lang":"eng","text":"Signatures of the Coulomb corrections in the photoelectron momentum distribution during laser-induced ionization of atoms or ions in tunneling and multiphoton regimes are investigated analytically in the case of a one-dimensional problem. A high-order Coulomb-corrected strong-field approximation is applied, where the exact continuum state in the S matrix is approximated by the eikonal Coulomb-Volkov state including the second-order corrections to the eikonal. Although without high-order corrections our theory coincides with the known analytical R-matrix (ARM) theory, we propose a simplified procedure for the matrix element derivation. Rather than matching the eikonal Coulomb-Volkov wave function with the bound state as in the ARM theory to remove the Coulomb singularity, we calculate the matrix element via the saddle-point integration method by time as well as by coordinate, and in this way avoiding the Coulomb singularity. The momentum shift in the photoelectron momentum distribution with respect to the ARM theory due to high-order corrections is analyzed for tunneling and multiphoton regimes. The relation of the quantum corrections to the tunneling delay time is discussed."}],"date_updated":"2023-09-20T11:57:23Z","oa_version":"Submitted Version","type":"journal_article","month":"02","date_created":"2018-12-11T11:50:01Z","volume":95,"year":"2017","_id":"1076","publication_status":"published","oa":1,"main_file_link":[{"url":"https://arxiv.org/abs/1609.07018","open_access":"1"}],"date_published":"2017-02-01T00:00:00Z","status":"public","external_id":{"isi":["000400571700011"]},"citation":{"apa":"Klaiber, M., Daněk, J., Yakaboylu, E., Hatsagortsyan, K., &#38; Keitel, C. (2017). Strong-field ionization via a high-order Coulomb-corrected strong-field approximation. <i> Physical Review A - Atomic, Molecular, and Optical Physics</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevA.95.023403\">https://doi.org/10.1103/PhysRevA.95.023403</a>","ista":"Klaiber M, Daněk J, Yakaboylu E, Hatsagortsyan K, Keitel C. 2017. Strong-field ionization via a high-order Coulomb-corrected strong-field approximation.  Physical Review A - Atomic, Molecular, and Optical Physics. 95(2), 023403.","mla":"Klaiber, Michael, et al. “Strong-Field Ionization via a High-Order Coulomb-Corrected Strong-Field Approximation.” <i> Physical Review A - Atomic, Molecular, and Optical Physics</i>, vol. 95, no. 2, 023403, American Physical Society, 2017, doi:<a href=\"https://doi.org/10.1103/PhysRevA.95.023403\">10.1103/PhysRevA.95.023403</a>.","ama":"Klaiber M, Daněk J, Yakaboylu E, Hatsagortsyan K, Keitel C. Strong-field ionization via a high-order Coulomb-corrected strong-field approximation. <i> Physical Review A - Atomic, Molecular, and Optical Physics</i>. 2017;95(2). doi:<a href=\"https://doi.org/10.1103/PhysRevA.95.023403\">10.1103/PhysRevA.95.023403</a>","short":"M. Klaiber, J. Daněk, E. Yakaboylu, K. Hatsagortsyan, C. Keitel,  Physical Review A - Atomic, Molecular, and Optical Physics 95 (2017).","chicago":"Klaiber, Michael, Jiří Daněk, Enderalp Yakaboylu, Karen Hatsagortsyan, and Christoph Keitel. “Strong-Field Ionization via a High-Order Coulomb-Corrected Strong-Field Approximation.” <i> Physical Review A - Atomic, Molecular, and Optical Physics</i>. American Physical Society, 2017. <a href=\"https://doi.org/10.1103/PhysRevA.95.023403\">https://doi.org/10.1103/PhysRevA.95.023403</a>.","ieee":"M. Klaiber, J. Daněk, E. Yakaboylu, K. Hatsagortsyan, and C. Keitel, “Strong-field ionization via a high-order Coulomb-corrected strong-field approximation,” <i> Physical Review A - Atomic, Molecular, and Optical Physics</i>, vol. 95, no. 2. American Physical Society, 2017."},"intvolume":"        95"},{"publication_identifier":{"issn":["24699926"]},"quality_controlled":"1","doi":"10.1103/PhysRevA.95.033608","project":[{"grant_number":"694227","_id":"25C6DC12-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Analysis of quantum many-body systems"},{"name":"Structure of the Excitation Spectrum for Many-Body Quantum Systems","call_identifier":"FWF","_id":"25C878CE-B435-11E9-9278-68D0E5697425","grant_number":"P27533_N27"},{"grant_number":"P29902","name":"Quantum rotations in the presence of a many-body environment","call_identifier":"FWF","_id":"26031614-B435-11E9-9278-68D0E5697425"}],"issue":"3","language":[{"iso":"eng"}],"isi":1,"day":"06","author":[{"full_name":"Li, Xiang","id":"4B7E523C-F248-11E8-B48F-1D18A9856A87","first_name":"Xiang","last_name":"Li"},{"first_name":"Robert","last_name":"Seiringer","full_name":"Seiringer, Robert","id":"4AFD0470-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-6781-0521"},{"orcid":"0000-0002-6990-7802","id":"37CB05FA-F248-11E8-B48F-1D18A9856A87","full_name":"Lemeshko, Mikhail","last_name":"Lemeshko","first_name":"Mikhail"}],"publist_id":"6242","article_number":"033608","title":"Angular self-localization of impurities rotating in a bosonic bath","department":[{"_id":"MiLe"},{"_id":"RoSe"}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","publisher":"American Physical Society","ec_funded":1,"article_processing_charge":"No","scopus_import":"1","publication":"Physical Review A","oa":1,"publication_status":"published","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1610.04908"}],"date_published":"2017-03-06T00:00:00Z","status":"public","external_id":{"isi":["000395981900009"]},"citation":{"ieee":"X. Li, R. Seiringer, and M. Lemeshko, “Angular self-localization of impurities rotating in a bosonic bath,” <i>Physical Review A</i>, vol. 95, no. 3. American Physical Society, 2017.","chicago":"Li, Xiang, Robert Seiringer, and Mikhail Lemeshko. “Angular Self-Localization of Impurities Rotating in a Bosonic Bath.” <i>Physical Review A</i>. American Physical Society, 2017. <a href=\"https://doi.org/10.1103/PhysRevA.95.033608\">https://doi.org/10.1103/PhysRevA.95.033608</a>.","short":"X. Li, R. Seiringer, M. Lemeshko, Physical Review A 95 (2017).","ama":"Li X, Seiringer R, Lemeshko M. Angular self-localization of impurities rotating in a bosonic bath. <i>Physical Review A</i>. 2017;95(3). doi:<a href=\"https://doi.org/10.1103/PhysRevA.95.033608\">10.1103/PhysRevA.95.033608</a>","mla":"Li, Xiang, et al. “Angular Self-Localization of Impurities Rotating in a Bosonic Bath.” <i>Physical Review A</i>, vol. 95, no. 3, 033608, American Physical Society, 2017, doi:<a href=\"https://doi.org/10.1103/PhysRevA.95.033608\">10.1103/PhysRevA.95.033608</a>.","ista":"Li X, Seiringer R, Lemeshko M. 2017. Angular self-localization of impurities rotating in a bosonic bath. Physical Review A. 95(3), 033608.","apa":"Li, X., Seiringer, R., &#38; Lemeshko, M. (2017). Angular self-localization of impurities rotating in a bosonic bath. <i>Physical Review A</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevA.95.033608\">https://doi.org/10.1103/PhysRevA.95.033608</a>"},"intvolume":"        95","related_material":{"record":[{"status":"public","id":"8958","relation":"dissertation_contains"}]},"type":"journal_article","month":"03","oa_version":"Published Version","abstract":[{"text":"The existence of a self-localization transition in the polaron problem has been under an active debate ever since Landau suggested it 83 years ago. Here we reveal the self-localization transition for the rotational analogue of the polaron -- the angulon quasiparticle. We show that, unlike for the polarons, self-localization of angulons occurs at finite impurity-bath coupling already at the mean-field level. The transition is accompanied by the spherical-symmetry breaking of the angulon ground state and a discontinuity in the first derivative of the ground-state energy. Moreover, the type of the symmetry breaking is dictated by the symmetry of the microscopic impurity-bath interaction, which leads to a number of distinct self-localized states. The predicted effects can potentially be addressed in experiments on cold molecules trapped in superfluid helium droplets and ultracold quantum gases, as well as on electronic excitations in solids and Bose-Einstein condensates. ","lang":"eng"}],"date_updated":"2023-09-20T11:30:58Z","date_created":"2018-12-11T11:50:15Z","volume":95,"year":"2017","_id":"1120"}]