Sound propagation in a uniform superfluid two-dimensional Bose gas
Quantum Gases
2018-10-10 v1
Abstract
In superfluid systems several sound modes can be excited, as for example first and second sound in liquid helium. Here, we excite propagating and standing waves in a uniform two-dimensional Bose gas and we characterize the propagation of sound in both the superfluid and normal regime. In the superfluid phase, the measured speed of sound is well described by a two-fluid hydrodynamic model, and the weak damping rate is well explained by the scattering with thermal excitations. In the normal phase the sound becomes strongly damped due to a departure from hydrodynamic behavior.
Keywords
Cite
@article{arxiv.1804.04037,
title = {Sound propagation in a uniform superfluid two-dimensional Bose gas},
author = {J. L. Ville and R. Saint-Jalm and É. Le Cerf and M. Aidelsburger and S. Nascimbène and J. Dalibard and J. Beugnon},
journal= {arXiv preprint arXiv:1804.04037},
year = {2018}
}
Comments
Supplementary Material available as ancillary files