Electronic structure of multiquantum giant vortex states in mesoscopic superconducting disks

TL;DR

This paper presents self-consistent microscopic calculations revealing unique electronic structures of multiquantum giant vortex states in mesoscopic superconducting disks, highlighting quantum confinement effects observable via tunneling spectroscopy.

Contribution

It provides the first detailed theoretical analysis of the electronic structure of giant vortex states in mesoscopic superconductors, emphasizing quantum interference effects.

Findings

Multiple bound state branches in vortex cores

Tomasch oscillations in local density of states

Observable features via scanning tunneling spectroscopy

Abstract

We report self-consistent calculations of the microscopic electronic structure of the so-called giant vortex states. These novel multiquantum vortex states, detected by recent magnetization measurements on submicron disks, are qualitatively different from the Abrikosov vortices in the bulk. We find that, in addition to multiple branches of bound states in the core region, the local tunneling density of states exhibits Tomasch oscillations due to the single-particle interference arising from quantum confinement. These features should be directly observable by scanning tunneling spectroscopy.