How many quasiparticles can be in a superconductor?
classification
❄️ cond-mat.supr-con
cond-mat.mes-hall
keywords
quasiparticlesconcentrationsuperconductoragentalwaysboundcompetitiondynamics
read the original abstract
Experimentally and mysteriously, the concentration of quasiparticles in a gapped superconductor at low temperatures always by far exceeds its equilibrium value. We study the dynamics of localized quasiparticles in superconductors with a spatially fluctuating gap edge. The competition between phonon-induced quasiparticle recombination and generation by a weak non-equilibrium agent results in an upper bound for the concentration that explains the mystery.
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