Zero Sound in Dipolar Fermi Gases

Abstract

We study the propagation of sound in a homogeneous dipolar gas at zero temperature, known as zero sound. We find that undamped sound propagation is possible only in a range of solid angles around the direction of polarization of the dipoles. Above a critical dipole moment, we find an unstable mode, by which the gas collapses locally perpendicular to the dipoles' direction.

Significant changes due to newly found instability

References in corpus (13)

• Theory of ultracold Fermi gases
• A High Phase-Space-Density Gas of Polar Molecules
• The physics of dipolar bosonic quantum gases
• Strong dipolar effects in a quantum ferrofluid
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• Ultracold dense gas of deeply bound heteronuclear molecules
• Exact hydrodynamics of a trapped dipolar Bose-Einstein condensate
• Phase space deformation of a trapped dipolar Fermi gas
• Biaxial nematic phases in ultracold dipolar Fermi gases
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Cited by in corpus (41)

• Condensed Matter Theory of Dipolar Quantum Gases
• Manipulation of Molecules with Electromagnetic Fields
• Beyond Mean-Field Low-Lying Excitations of Dipolar Bose Gases
• Tuning of dipolar interactions and evaporative cooling in a three-dimensional molecular quantum gas
• Observation of Fermi surface deformation in a dipolar quantum gas
• Dysprosium magneto-optical traps
• Density wave instability in a 2D dipolar Fermi gas
• Collective modes, stability and superfluid transition of a quasi-two-dimensional dipolar Fermi gas
• Singlet and triplet BCS pairs in a gas of two-species fermionic polar molecules
• Supersolid Phase of Cold Fermionic Polar Molecules in 2D Optical Lattices
• Dipolar Fermi gases in anisotropic traps
• The J-triplet Cooper pairing with magnetic dipolar interactions
• Compressibility, zero sound, and effective mass of a fermionic dipolar gas at finite temperature
• Thermodynamics and coherence of a trapped dipolar Fermi gas
• Collective modes of monolayer, bilayer, and multilayer fermionic dipolar liquid
• Spin-orbit coupled Fermi liquid theory of ultra-cold magnetic dipolar fermions
• Unconventional magnetism in imbalanced Fermi systems with magnetic dipolar interactions
• Ultra-cold Fermi gases with resonant dipole-dipole interaction
• Anisotropic sub-Doppler laser cooling in dysprosium magneto-optical traps
• Collective phenomena in quasi-two-dimensional fermionic polar molecules: band renormalization and excitons
• Correlation energy of a homogeneous dipolar Fermi gas
• Quantum phases of a one-dimensional dipolar Fermi gas
• The ground state of polaron in an ultracold dipolar Fermi gas
• Dipolar Drag in Bilayer Harmonically Trapped Gases
• Dynamical properties of a trapped dipolar Fermi gas at finite temperature
• Unconventional symmetries of Fermi liquid and Cooper pairing properties with electric and magnetic dipolar fermions
• Reentrant Superfluidity and Pair Density Wave in Single Component Dipolar Fermi Gases
• Thermoviscous Hydrodynamics in Non-Degenerate Dipolar Bose Gases
• Ground state of an ultracold Fermi gas of tilted dipoles in elongated traps
• Second-order interaction corrections to the Fermi surface and the quasiparticle properties of dipolar fermions in three dimensions
• A local exchange theory for trapped dipolar gases
• Density and spin modes in imbalanced normal Fermi gases from collisionless to hydrodynamic regime
• Stability of trapped degenerate dipolar Bose and Fermi gases
• Superfluid pairing in a mixture of a spin-polarized Fermi gas and a dipolar condensate
• Stability of quantum degenerate Fermi gases of tilted polar molecules
• Multipolar Fermi-surface deformation in a Rydberg-dressed Fermi gas with long-range anisotropic interactions
• Interplay between shell structure and trap deformation in dipolar fermi gases
• Itinerant ferromagnetism of a dipolar Fermi gas with Raman-induced spin-orbit coupling
• Thermal-assisted Anisotropy and Thermal-driven Instability in the Superfluidity state of Two-Species Polar Fermi Gas
• Zero sound in a quantum gas of spin-3/2 atoms with multipole exchange interaction
• General collisionless kinetic approach to studying excitations in arbitrary-spin quantum atomic gases