Electronic structure and heat transport in multivortex configurations in mesoscopic superconductors - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: On the basis of the Bogoliubov-de Gennes theory we study the transformationof the quasiparticle spectrum in the mixed state of a mesoscopicsuperconductor, governed by an external magnetic field. We analyze the lowenergy part of the excitation spectrum and investigate the field-dependentbehavior of anomalous spectral branches crossing the Fermi level. Generalizingthe Caroli-de Gennes-Matricon approach we present an analytical solutiondescribing the anomalous branches in a vortex with an arbitrary winding number.We also study the spectrum transformation caused by the splitting of amultiquantum vortex into a set of well separated vortices focusing mainly on ageneric example of a two-vortex system. For vortices positioned rather closeto the sample surface we investigate the effect of the quasiparticle reflectionat the boundary on the spectrum and the density of states at the Fermi level.Considering an arbitrary surface curvature we study the disappearance of ananomalous spectral branch for a vortex leaving the sample. The changes in thevortex configuration and resulting transformation of the anomalous branches areshown to affect strongly the density of states and the heat conductance alongthe magnetic field direction.



Autor: A. S. Mel'nikov, D. A. Ryzhov, M. A. Silaev

Fuente: https://arxiv.org/







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