Effect of the coupling to a superconductor on the level statistics of a metal grain in a magnetic field

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dc.creatorFrahm, K. M.
dc.creatorBrouwer, P. W.
dc.creatorMelsen, J. A.
dc.creatorBeenakker, C. W. J.
dc.date1996-03-22
dc.date.accessioned2026-07-07T03:08:26Z
dc.date.available2026-07-07T03:08:26Z
dc.descriptionA theory is presented for the statistics of the excitation spectrum of a disordered metal grain in contact with a superconductor. A magnetic field is applied to fully break time-reversal symmetry in the grain. Still, an excitation gap of the order of $δ$ opens up provided $NΓ^2\gtrsim 1$. Here $δ$ is the mean level spacing in the grain, $Γ$ the tunnel probability through the contact with the superconductor, and $N$ the number of transverse modes in the contact region. This provides a microscopic justification for the new random-matrix ensemble of Altland and Zirnbauer.
dc.description4 pages, 2 figures, to appear in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/cond-mat/9603146
dc.identifierhttp://arxiv.org/abs/cond-mat/9603146
dc.identifierPhys. Rev. Lett. 76, 2981 (1996)
dc.identifierdoi:10.1103/PhysRevLett.76.2981
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/27500
dc.subjectCondensed Matter
dc.titleEffect of the coupling to a superconductor on the level statistics of a metal grain in a magnetic field
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