Collisionless Sound in a Uniform Two-Dimensional Bose Gas
Using linear response theory within the random phase approximation, we investigate the propagation of sound in a uniform two dimensional (2D) Bose gas in the collisionless regime. We show that the sudden removal of a static density perturbation produces a damped oscillatory behavior revealing that s...
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| Veröffentlicht in: | Physical review letters 2018-10, Vol.121 (14), p.145302-145302, Article 145302 |
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| container_end_page | 145302 |
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| container_issue | 14 |
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| container_title | Physical review letters |
| container_volume | 121 |
| creator | Ota, Miki Larcher, Fabrizio Dalfovo, Franco Pitaevskii, Lev Proukakis, Nick P Stringari, Sandro |
| description | Using linear response theory within the random phase approximation, we investigate the propagation of sound in a uniform two dimensional (2D) Bose gas in the collisionless regime. We show that the sudden removal of a static density perturbation produces a damped oscillatory behavior revealing that sound can propagate also in the absence of collisions, due to mean-field interaction effects. We provide explicit results for the sound velocity and damping as a function of temperature, pointing out the crucial role played by Landau damping. We support our predictions by performing numerical simulations with the stochastic (projected) Gross-Pitaevskii equation. The results are consistent with the recent experimental observation of sound in a weakly interacting 2D Bose gas both below and above the superfluid Berezinskii-Kosterlitz-Thouless transition. |
| doi_str_mv | 10.1103/physrevlett.121.145302 |
| format | Article |
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| source | American Physical Society Journals; EZB-FREE-00999 freely available EZB journals |
| subjects | Acoustic velocity Computer simulation Fluids Landau damping Sound propagation Superfluidity |
| title | Collisionless Sound in a Uniform Two-Dimensional Bose Gas |
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