Spectroscopic signatures of nonequilibrium pairing in atomic Fermi gases

Abstract

We determine the radio-frequency (RF) spectra for non-stationary states of a fermionic condensate produced by a rapid switch of the scattering length. The RF spectrum of the nonequilibrium state with constant BCS order parameter has two features in contrast to equilibrium where there is a single peak. The additional feature reflects the presence of excited pairs in the steady state. In the state characterized by periodically oscillating order parameter RF-absorption spectrum contains two sequences of peaks spaced by the frequency of oscillations. Satellite peaks appear due to a process where an RF photon in addition to breaking a pair emits/absorbs oscillation quanta.

4 pages, 5 figures

References in corpus (6)

• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Synchronization in the BCS Pairing Dynamics as a Critical Phenomenon
• Dynamical vanishing of the order parameter in a fermionic condensate
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture

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• Nonequilibrium pairing instability in ultracold Fermi gases with population imbalance
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• Slow interaction quench in BCS superconductors: emergence of pre-formed pairs
• Dynamics of a quantum quench in an ultra-cold atomic BCS superfluid
• Nonlocality as the source of purely quantum dynamics of BCS superconductors