Surface and vortex structures in noncentrosymmetric superconductors under applied magnetic fields

TL;DR

This paper explores how noncentrosymmetric superconductors exhibit unique vortex and surface structures due to broken inversion symmetry, revealing spontaneous flux flow induced by paramagnetic supercurrents.

Contribution

It introduces a microscopic Ginzburg-Landau model incorporating Pauli and Rashba effects to explain macroscopic symmetry breaking and spontaneous flux flow in these materials.

Findings

Broken centrosymmetric structures of internal fields and currents

Spontaneous flux flow without external currents

Macroscopic manifestation of broken inversion symmetry

Abstract

We investigate how the macroscopic spatial structure of broken inversion symmetry manifests in noncentrosymmetric superconductors, by the microscopic broken inversion symmetry of the crystal structure. Based on the time-dependent Ginzburg-Landau theory including the Pauli paramagnetic effect and the Rashba interaction, we demonstrate that the centrosymmetric structures of the internal field and the screening current are broken macroscopically. The flow structure of paramagnetic supercurrent spontaneously induce the flux flow without applying external currents.