Multi-condensate states in BCS superconductors

Abstract

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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References in corpus (1)

• Dissipationless BCS Dynamics with Large Branch Imbalance

Cited by in corpus (3)

• Exact expectation values within Richardson's approach for the pairing Hamiltonian in a macroscopic system
• Coherence Factors Beyond the BCS Expressions -- A Derivation
• Coherence Factors Beyond the BCS Result