Sound Propagation in a Uniform Superfluid Two-Dimensional Bose Gas.

@article{Ville2018SoundPI,
  title={Sound Propagation in a Uniform Superfluid Two-Dimensional Bose Gas.},
  author={J. L. Ville and Raphael Saint-Jalm and {\'E} Le Cerf and Monika Aidelsburger and Sylvain Nascimb{\`e}ne and Jean Dalibard and J 'er ome Beugnon},
  journal={Physical review letters},
  year={2018},
  volume={121 14},
  pages={
          145301
        }
}
In superfluid systems several sound modes can be excited, such as, for example, first and second sound in liquid helium. Here, we excite running and standing waves in a uniform two-dimensional Bose gas and we characterize the propagation of sound in both the superfluid and normal regimes. In the superfluid phase, the measured speed of sound is in good agreement with the prediction of a two-fluid hydrodynamic model, and the weak damping is well explained by the scattering with thermal… CONTINUE READING

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