# Electronic structure of mesoscopic superconducting disk: Quasiparticle tunneling between the giant vortex core and disk edge

## TL;DR

This paper investigates how quasiparticle tunneling influences the electronic structure of giant vortex states in mesoscopic superconducting disks, revealing a temperature-dependent crossover affecting tunneling conductance and potential cooling applications.

## Contribution

It introduces a detailed analysis of quasiparticle tunneling effects in mesoscopic superconductors using the Usadel approach, highlighting a temperature-driven crossover in tunneling regimes.

## Key findings

- Quasiparticle tunneling significantly alters local density of states.
- A crossover from edge-dominated to core-dominated tunneling occurs with decreasing temperature.
- Magnetic field influences quasiparticle cooling efficiency in mesoscopic devices.

## Abstract

The electronic structure of the giant vortex states in a mesoscopic superconducting disk is studied in a dirty limit using the Usadel approach. The local density of states profiles are shown to be strongly affected by the effect of quasiparticle (QP) tunneling between the states localized in the vortex core and the ones bound to the sample edge. Decreasing temperature leads to a crossover between the edge-dominated and core-dominated regimes in the magnetic field dependence of the tunneling conductance. This crossover is discussed in the context of the efficiency of quasiparticle cooling by the magnetic field induced QP traps in various mesoscopic superconducting devices.