Dynamical spin polarization of excess quasi-particles in superconductors

Abstract

We show that the annihilation dynamics of excess quasi-particles in superconductors may result in the spontaneous formation of large spin-polarized clusters. This presents a novel scenario for spontaneous spin polarization. We estimate the relevant scales for aluminum, finding the feasibility of clusters with total spin $S\simeq 10^4\hslash$ that could be spread over microns. The fluctuation dynamics of such large spins may be detected by measuring the flux noise in a loop hosting a cluster.

5+3 pages, 2+1 figures

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Cited by in corpus (2)

• Ultralong-distance quantum correlations in three-terminal Josephson junctions
• Strong Reduction of Quasiparticle Fluctuations in a Superconductor due to Decoupling of the Quasiparticle Number and Lifetime