Spectral Flow and Quantum Theory of Dissipation in the Vortex Core of BCS superconductors

TL;DR

This paper investigates the quantum mechanical origins of dissipation in 2D BCS superconductors by analyzing spectral flow of vortex core quasiparticles, including impurity effects, through numerical simulations.

Contribution

It introduces a quantum mechanical framework for understanding vortex core dissipation, emphasizing spectral flow and impurity effects in 2D BCS superconductors.

Findings

Spectral flow is key to understanding vortex dissipation.

Impurities significantly affect the spectral flow and dissipation.

Numerical simulations reveal the quantum origin of vortex core dissipation.

Abstract

The dissipation process in two dimensional BCS superconductor due to the quasiparticles in the core of moving vortex is studied from a quantum mechanical point of view, especially paying attention to the spectral flow of the bound state energies in the vortex core. In order to clarify the nature of the spectral flow, we performed a numerical study of a finite system and, by extending the analysis to include the effect of impurities, we discuss the quantum mechanical origin of the dissipation in the vortex core.