Edge Tunneling of Vortices in Superconducting Thin Films

Details Edge Tunneling of Vortices in Superconducting Thin Films Edge Tunneling of Vortices in Superconducting Thin Films

1996-08-13

arxiv.org/abs/cond-mat/9608059v1

Physics

Condensed Matter

REVTeX file, 15 pages, 1 Postscript figure; to appear in Phys.Rev.B

Scientific paper

10.1103/PhysRevB.54.13207

We investigate the phenomenon of the decay of a supercurrent due to the zero-temperature quantum tunneling of vortices from the edge in a thin superconducting film in the absence of an external magnetic field. An explicit formula is derived for the tunneling rate of vortices, which are subject to the Magnus force induced by the supercurrent, through the Coulomb-like potential barrier binding them to the film's edge. Our approach ensues from the non-relativistic version of a Schwinger-type calculation for the decay of the 2D vacuum previously employed for describing vortex-antivortex pair-nucleation in the bulk of the sample. In the dissipation-dominated limit, our explicit edge-tunneling formula yields numerical estimates which are compared with those obtained for bulk-nucleation to show that both mechanisms are possible for the decay of a supercurrent.

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