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VOLUME 83 (2006) | ISSUE 12 | PAGE 675
Intervortex quasiparticle tunneling and electronic structure of multi-vortex configurations in type-II superconductors
PACS: 74.25.-q, 74.78.Na
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<ac, where the critical distance ac 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.