Quench dynamics of a confined ultracold Fermi gas: Direct visibility of the Goldstone mode in the single-particle excitations
arXiv:1511.04239 · doi:10.1103/PhysRevA.96.033618
Abstract
We present a numerical study of a confined ultracold Fermi gas showing that the Goldstone mode of the BCS gap is directly visible in the dynamics of the single-particle excitations. To this end, we investigate the low-energy dynamic response of a confined Fermi gas to a rapid change of the scattering length (i.e., an interaction quench). Based on a fully microscopic time-dependent density-matrix approach within the Bogoliubov-de Gennes formalism that includes a 3D harmonic confinement we simulate and identify the emergence of the Goldstone mode in a cigar-shaped Li gas. We show that the quench leads to a low-frequency in-phase oscillation of the single-particle occupations. Complete inversion is achieved for occupations corresponding to the lowest-lying single-particle states.
This article has become part of the publication arXiv:1708.07709 [cond-mat.quant-gas] which includes a more detailed analysis of the visibility of the interaction quench-induced Goldstone mode in RF spectroscopy
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- Persistent oscillations of the order parameter and interaction quench phase diagram for a confined Bardeen-Cooper-Schrieffer Fermi gas
- Quantum annealing and thermalization: insights from integrability
- Decay and revival of a transient trapped Fermi condensate
- Dynamical instability towards finite-momentum pairing in quenched BCS superconducting phases
- Dynamic structure factor of two-dimensional Fermi superfluid with Rashba spin-orbit coupling