Intervortex quasiparticle tunneling and electronic structure of multi-vortex configurations in type-II superconductors

A. S. Mel'nikov; M. A. Silaev

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arXiv · cond-mat/0605518

Intervortex quasiparticle tunneling and electronic structure of multi-vortex configurations in type-II superconductors

A. S. Mel'nikov·M. A. Silaev

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Abstract

The electronic spectrum of multi-vortex configurations in type-II superconductors is studied taking account of the effect of quasiparticle tunneling between the vortex cores. The tunneling is responsible for the formation of strongly coupled quasiparticle states for intervortex distances $a<a_c$, where the critical distance $a_c$ is of the order of several coherence lengths $ξ$. Analyzing the resulting spectra of vortex clusters bonded by the quasiparticle tunneling we find a transition from a set of degenerate Caroli - de Gennes - Matricon branches to anomalous branches similar to the ones in multi-quanta giant vortices. This spectrum transformation results in the oscillatory behavior of the density of states at the Fermi level as a function of $a$ and could be observed in mesoscopic superconductors and disordered flux line arrays in the bulk systems.

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A. S. Mel'nikov, M. A. Silaev. 2006-05-22. Intervortex quasiparticle tunneling and electronic structure of multi-vortex configurations in type-II superconductors. https://arxiv.org/abs/cond-mat/0605518

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