Dynamics of emergent Cooper pairing at finite temperatures

27 Dec 2007  ·  Emil A. Yuzbashyan, Oleksandr Tsyplyatyev ·

We study the time evolution of a system of fermions with pairing interactions at a finite temperature. The dynamics is triggered by an abrupt increase of the BCS coupling constant... We show that if initially the fermions are in a normal phase, the amplitude of the BCS order parameter averaged over the Boltzman distribution of initial states exhibits damped oscillations with a relatively short decay time. The latter is determined by the temperature, the single-particle level spacing, and the ground state value of the BCS gap for the new coupling. In contrast, the decay is essentially absent when the system was in a superfluid phase before the coupling increase. read more

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Superconductivity Mesoscale and Nanoscale Physics