Spin oscillations of the normal polarized Fermi gas at Unitarity

Abstract

Using density functional theory in a time dependent approach we determine the frequencies of the compressional modes of the normal phase of a Fermi gas at unitarity as a function of its polarization. Our energy functional accounts for the typical elastic deformations exhibited by Landau theory of Fermi liquids. The comparison with the available experiments is biased by important collisional effects affecting both the {\it in phase} and the {\it out of phase} oscillations even at the lowest temperatures. New experiments in the collisionless regime would provide a crucial test of the applicability of Landau theory to the dynamics of these strongly interacting normal Fermi gases.

5 pages, 1 figure

References in corpus (11)

• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Exploring the Thermodynamics of a Universal Fermi Gas
• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
• The Equation of State of a Low-Temperature Fermi Gas with Tunable Interactions
• Collective Oscillations of an Imbalanced Fermi Gas: Axial Compression Modes and Polaron Effective Mass
• Fermi-Polaron: Diagrammatic Monte Carlo for Divergent Sign-Alternating Series
• Normal state of a polarized Fermi gas at unitarity
• Normal state of highly polarized Fermi gases: Full many-body treatment
• Collisional Properties of a Polarized Fermi Gas with Resonant Interactions
• The normal phase of an imbalanced Fermi gas
• The role of interactions in spin-polarised atomic Fermi gases at unitarity

Cited by in corpus (5)

• High-temperature expansion of the viscosity in interacting quantum gases
• Polar molecules in bilayers with high population imbalance
• Density and spin modes in imbalanced normal Fermi gases from collisionless to hydrodynamic regime
• Collective modes of an imbalanced unitary Fermi gas
• Dispersion of first sound in a weakly interacting ultracold Fermi liquid