Damping of the Anderson-Bogolyubov mode by spin and mass imbalance in Fermi mixtures
arXiv:1908.08559 · doi:10.1103/PhysRevA.100.053622
Abstract
We study the temporally nonlocal contributions to the gradient expansion of the pair fluctuation propagator for spin- and mass-imbalanced Fermi mixtures. These terms are related to damping processes of sound-like (Anderson-Bogolyubov) collective modes and are relevant for the structure of the complex pole of the pair fluctuation propagator. We derive conditions under which damping occurs even at zero temperature for large enough mismatch of the Fermi surfaces. We compare our analytical results with numerically computed damping rates of the Anderson-Bogolyubov mode.
arXiv comment9 pages, 6 figures
References in corpus (55)
- Many-Body Physics with Ultracold Gases
- Theory of ultracold Fermi gases
- Fermi-liquid instabilities at magnetic quantum phase transitions
- Pairing and Phase Separation in a Polarized Fermi Gas
- Fermionic Superfluidity with Imbalanced Spin Populations and the Quantum Phase Transition to the Normal State
- Collective excitations of a degenerate gas at the BEC-BCS crossover
- Interior Gap Superfluidity
- Exploring an ultracold Fermi-Fermi mixture: Interspecies Feshbach resonances and scattering properties of 6Li and 40K
- Quantum degenerate two-species Fermi-Fermi mixture coexisting with a Bose-Einstein condensate
- Homogeneous Atomic Fermi Gases
- Precision Measurements of Collective Oscillations in the BEC-BCS Crossover
- Imbalanced Feshbach-resonant Fermi gases
- Quantum Fluctuations in the Superfluid State of the BCS-BEC Crossover
- Collective mode of homogeneous superfluid Fermi gases in the BEC-BCS crossover
- Evolution from BCS Superconductivity to Bose Condensation: Analytic Results for the crossover in three dimensions
- Ultracold Heteronuclear Fermi-Fermi Molecules
- Superfluidity and collective modes in a uniform gas of Fermi atoms with a Feshbach resonance
- Two-Dimensional Homogeneous Fermi Gases
- Universal thermodynamics of strongly interacting Fermi gases
- BCS-BEC crossover at finite temperature in the broken-symmetry phase
- Fluctuations and phase transitions in Larkin-Ovchinnikov liquid crystal states of population-imbalanced resonant Fermi gas
- Goldstone mode and pair-breaking excitations in atomic Fermi superfluids
- Higgs mode in a strongly interacting fermionic superfluid
- Broad Feshbach resonance in the 6Li-40K mixture
- Spin-Imbalanced Quasi-Two-Dimensional Fermi Gases
- Polarized Fermi condensates with unequal masses: Tuning the tricritical point
- Phase Fluctuations and Kosterlitz-Thouless Transition in Two-Dimensional Fulde-Ferrell-Larkin-Ovchinnikov Superconductors
- Tuning the Tricritical Point with Spin-orbit Coupling in Polarized Fermionic Condensates
- Collective Modes in a Unitary Fermi Gas across the Superfluid Phase Transition
- Population and mass imbalance in atomic Fermi gases
- Topological phase transitions in ultra-cold Fermi superfluids: the evolution from BCS to BEC under artificial spin-orbit fields
- Mixtures of ultracold fermions with unequal masses
- Phase separation and pair condensation in a spin-imbalanced 2D Fermi gas
- Pair-Breaking Collective Branch in BCS Superconductors and Superfluid Fermi Gases
- BCS-BEC crossover of collective excitations in two-band superfluids
- Fulde-Ferrell states and Berezinskii-Kosterlitz-Thouless phase transition in two-dimensional imbalanced Fermi gases
- Concavity of the collective excitation branch of a Fermi gas in the BEC-BCS crossover
- Finite temperature effective field theory and two-band superfluidity in Fermi gases
- Quantum phases of atomic Fermi gases with anisotropic spin-orbit coupling
- Instability of Fulde-Ferrell-Larkin-Ovchinnikov states in three and two dimensions
- Collective modes of spin-orbit coupled Fermi gases in the repulsive regime
- Non-Fermi liquid at the FFLO quantum critical point
- Evolution of Higgs mode in a Fermion Superfluid with Tunable Interactions
- Renormalization theory for the Fulde-Ferrell-Larkin-Ovchinnikov states at
- FFLO strange metal and quantum criticality in two dimensions: theory and application to organic superconductors
- Low-momentum dynamic structure factor of a strongly interacting Fermi gas at finite temperature: The Goldstone phonon and its Landau damping
- Fluctuations of imbalanced fermionic superfluids in two dimensions induce continuous quantum phase transitions and non-Fermi liquid behavior
- Pair excitations and parameters of state of imbalanced Fermi gases at finite temperatures
- Finite temperature damping of collective modes of a BCS-BEC crossover superfluid
- Absorption and emission of a collective excitation by a fermionic quasiparticle in a Fermi superfluid
- Landau Damping in a Mixture of Bose and Fermi Superfluids
- Effective potential and quantum criticality for imbalanced Fermi mixtures
- Low-energy modes of spin-imbalanced Fermi gases in BCS phase
- Goldstone and Higgs Hydrodynamics in the BCS-BEC Crossover
- Anderson-Bogoliubov collective excitations in superfluid Fermi gases at nonzero temperatures
Cited by in corpus (3)
- Beyond-mean-field description of a trapped unitary Fermi gas with mass and population imbalance
- Quantum Lifshitz points and fluctuation-induced first-order phase transitions in imbalanced Fermi mixtures
- Stability of the Fulde-Ferrell-Larkin-Ovchinnikov states in anisotropic systems and critical behavior at thermal -axial Lifshitz points