Scale invariance and viscosity of a two-dimensional Fermi gas
Quantum Gases
2012-02-21 v2
Abstract
We investigate the collective excitations of a harmonically trapped two-dimensional Fermi gas from the collisionless (zero sound) to the hydrodynamic (first sound) regime. The breathing mode, which is sensitive to the equation of state, is observed at a frequency two times the dipole mode frequency for a large range of interaction strengths and temperatures, and the amplitude of the breathing mode is undamped. This provides evidence for a dynamical SO(2,1) scaling symmetry of the two-dimensional Fermi gas. Moreover, we investigate the quadrupole mode to measure the shear viscosity of the two-dimensional gas and study its temperature dependence.
Keywords
Cite
@article{arxiv.1111.1173,
title = {Scale invariance and viscosity of a two-dimensional Fermi gas},
author = {Enrico Vogt and Michael Feld and Bernd Fröhlich and Daniel Pertot and Marco Koschorreck and Michael Köhl},
journal= {arXiv preprint arXiv:1111.1173},
year = {2012}
}