Scale invariance and viscosity of a two-dimensional Fermi gas

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.

References in corpus (9)

• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• Nonrelativistic conformal field theories
• Universal Quantum Viscosity in a Unitary Fermi Gas
• Observation of scale invariance and universality in two-dimensional Bose gases
• Observation of a pairing pseudogap in a two-dimensional Fermi gas
• Radiofrequency spectroscopy of a strongly interacting two-dimensional Fermi gas
• Viscosity and scale invariance in the unitary Fermi gas
• Shear viscosity and damping for a Fermi gas in the unitarity limit
• Dynamics of a strongly interacting Fermi gas: the radial quadrupole mode

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