Volume 87, Number 5, September 2009
|Number of page(s)||6|
|Published online||18 September 2009|
Delayed response of a fermion pair condensate to a modulation of the interaction strength
Departamento de Física Fundamental II, Universidad de La Laguna - La Laguna E-38204, Tenerife, Spain, EU
Corresponding author: firstname.lastname@example.org
Accepted: 19 August 2009
The effect of a sinusoidal modulation of the interaction strength on a fermion pair condensate is analytically studied. The system is described by a generalization of the coupled fermion-boson model that incorporates a time-dependent intermode coupling induced via a magnetic Feshbach resonance. Nontrivial effects are shown to emerge depending on the relative magnitude of the modulation period and the relaxation time of the condensate. Specifically, a nonadiabatic modulation drives the system out of thermal equilibrium: the external field induces a variation of the quasiparticle energies, and, in turn, a disequilibrium of the associated populations. The subsequent relaxation process is studied and an analytical description of the gap dynamics is obtained. Recent experimental findings are explained: the delay observed in the response to the applied field is understood as a temperature effect linked to the condensate relaxation time.
PACS: 05.30.Fk – Fermion systems and electron gas / 03.75.Ss – Degenerate Fermi gases
© EPLA, 2009
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