Spectroscopic signatures of nonequilibrium pairing in atomic fermi gases.
Phys Rev Lett
; 99(16): 160402, 2007 Oct 19.
Article
em En
| MEDLINE
| ID: mdl-17995224
ABSTRACT
We determine the radio-frequency (rf) spectra for nonstationary 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 with 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, the rf-absorption spectrum contains two sequences of peaks spaced by the frequency of oscillations. Satellite peaks appear due to a process where a rf photon in addition to breaking a pair emits or absorbs oscillation quanta.
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Estados Unidos