Dynamical Response of Fermi Condensate to Varying Magnetic Fields

Abstract

We investigate the dynamical response of strongly interacting ultra-cold fermionic atoms near Feshbach resonance to varying magnetic fields. Following the experimental practices, we calculate the response of the atoms to oscillating and to linearly ramped magnetic fields respectively. For oscillating magnetic fields, depending on the frequencies and the amplitudes of the oscillations, the response of the pair excitation gap shows either linear or rich non-linear behaviour. In addition, both the spectral studies through the linear response theory and the time-domain simulations suggest the existence of a resonant frequency corresponding to the pair dissociation threshold. For linearly ramped magnetic fields, the response of the excitation gap shows damped oscillations. The final value of the excitation gap depends on the rate of the field sweep.

6 pages, 6 figures

References in corpus (5)

• Observation of Bose-Einstein Condensation of Molecules
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Molecular Probe of Pairing in the BEC-BCS Crossover
• Nonequilibrium dynamics and thermodynamics of a degenerate Fermi gas across a Feshbach resonance

Cited by in corpus (5)

• Large Amplitude Dynamics of the Pairing Correlations in a Unitary Fermi Gas
• Topological phase transition in the quench dynamics of a one-dimensional Fermi gas
• Generation and decay of Higgs mode in a strongly interacting Fermi gas
• Exciting the long-lived Higgs mode in superfluid Fermi gases with particle removal
• Dynamics of a quantum quench in an ultra-cold atomic BCS superfluid