Topological Structure of a Vortex in Fulde-Ferrell-Larkin-Ovchinnikov State

TL;DR

This paper reveals the unique topological structure of vortices in the FFLO state, showing how vortex-nodal plane intersections affect spin distribution and magnetization, based on microscopic calculations.

Contribution

It provides a theoretical analysis of the vortex core topology in the FFLO state, highlighting differences from conventional vortices through a topological perspective.

Findings

Vortex cores in FFLO states differ topologically from ordinary vortices.

Intersection points of vortices and nodal planes empty excess spins.

Observable effects on spatial magnetization structure.

Abstract

We find theoretically that the vortex core in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is quite different from the ordinary core by a simple topological reason. The intersection point of a vortex and nodal plane of the FFLO state empties the excess spins. This leads to observable consequences in the spatial structure of the spontaneous magnetization. We analyze this topological structure based on the low lying excitation spectrum by solving microscopic Bogoliubov-de Gennes equation to clarify its physical origin.