Collective modes and superfluidity of a two-dimensional ultracold Bose gas
arXiv:2010.00013 · doi:10.1103/PhysRevResearch.3.023112
Abstract
The collective modes of a quantum liquid shape and impact its properties profoundly, including its emergent phenomena such as superfluidity. Here we present how a two-dimensional Bose gas responds to a moving lattice potential. In particular we discuss how the induced heating rate depends on the interaction strength and the temperature. This study is motivated by the recent measurements of Sobirey {\it et al.} arXiv:2005.07607 (2020), for which we provide a quantitative understanding. Going beyond the existing measurements, we demonstrate that this probing method allows to identify first and second sound in quantum liquids. We show that the two sound modes undergo hybridization as a function of interaction strength, which we propose to detect experimentally. This gives a novel insight into the two regimes of Bose gases, defined via the hierarchy of sounds modes.
arXiv commentMain text: 7 pages + 6 figures and Supplementary text: 5 pages + 4 figures
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Cited by in corpus (10)
- Observation of superfluidity in a strongly correlated two-dimensional Fermi gas
- Observation of the BKT Transition in a 2D Bose Gas via Matter-Wave Interferometry
- Superfluidity of a laser-stirred Bose-Einstein condensate
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- Josephson Dynamics in 2D Ring-shaped Condensates