Vortex dissipation and level dynamics for layered superconductors with impurities

Ayumi Fujita

doi:10.1103/PhysRevB.64.064504

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Vortex dissipation and level dynamics for layered superconductors with impurities

Ayumi Fujita

DOI 10.1103/PhysRevB.64.064504 · Physical Review B

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Abstract

We study parametric level statistics of the discretized excitation spectra inside a moving vortex core in layered superconductors with impurities. The universal conductivity is evaluated numerically for the various values of rescaled vortex velocities κ from the clean case to the dirty limit case. The random matrix theoretical prediction is verified numerically in the large κ regime. On the contrary, in the low velocity regime, we observe σxx∝κ2/3 which is consistent with the theoretical result for the superclean case, where the energy dissipation is due to the Landau-Zener transition which takes place at the points called “avoided crossing.”