Zero sound in a two-dimensional dipolar Fermi gas

Abstract

We study zero sound in a weakly interacting 2D gas of single-component fermionic dipoles (polar molecules or atoms with a large magnetic moment) tilted with respect to the plane of their translational motion. It is shown that the propagation of zero sound is provided by both mean field and many-body (beyond mean field) effects, and the anisotropy of the sound velocity is the same as the one of the Fermi velocity. The damping of zero sound modes can be much slower than that of quasiparticle excitations of the same energy. One thus has wide possibilities for the observation of zero sound modes in experiments with 2D fermionic dipoles, although the zero sound peak in the structure function is very close to the particle-hole continuum.

15 pages, 2 figures

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Cited by in corpus (10)

• Observation of Fermi surface deformation in a dipolar quantum gas
• Observing Properties of an Interacting Homogeneous Bose--Einstein Condensate: Heisenberg-Limited Momentum Spread, Interaction Energy and Free-Expansion Dynamics
• Two-dimensional Bose gas of tilted dipoles: roton instability and condensate depletion
• Dynamics of ultracold dipolar particles in a confined geometry and tilted fields
• Fulde-Ferrell-Larkin-Ovchinnikov state in bilayer dipolar systems
• Second-order interaction corrections to the Fermi surface and the quasiparticle properties of dipolar fermions in three dimensions
• Composite quasiparticles in strongly-correlated dipolar Fermi liquids
• Quantum Degenerate Majorana Surface Zero Modes in Two-Dimensional Space
• Zero sound in a quantum gas of spin-3/2 atoms with multipole exchange interaction
• Density Modulations of Zero Sound