Spectroscopic signatures of nonequilibrium pairing in atomic Fermi gases

Details Spectroscopic signatures of nonequilibrium pairing in atomic Fermi gases Spectroscopic signatures of nonequilibrium pairing in atomic Fermi gases

2007-05-15

arxiv.org/abs/0705.2069v2

Phys. Rev. Lett. 99, 160402 (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.99.160402

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.

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