Multi-condensate states in BCS superconductors

Details Multi-condensate states in BCS superconductors Multi-condensate states in BCS superconductors

2010-02-11

arxiv.org/abs/1002.2289v3

EPL, 90 (2010) 67002

Physics

Condensed Matter

Superconductivity

Text expanded, figures added, Journal Ref and DOI added

Scientific paper

10.1209/0295-5075/90/67002

A BCS (Bardeen-Cooper-Schrieffer) superconductor, which is placed out of equilibrium, can develop quantum instabilities, which manifest themselves in oscillations of the superconductor's order parameter (pairing amplitude $\Delta$). These instabilities are a manifestations of the Cooper instability. Inelastic collisions are essential in resolving those instabilities. Incorporating the quantum instabilities and collisions in a unified approach based on Richardson's exact solution of the pairing Hamiltonian, we find that a BCS superconductor may end up in a state in which the spectrum has more than one gap.

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