Persistent Current in the Ferromagnetic Kondo Lattice Model

TL;DR

This paper investigates zero temperature persistent currents in a ferromagnetic Kondo lattice model, revealing how spontaneous spin textures and geometric flux induce anomalous persistent currents depending on magnetic flux and electron count.

Contribution

It introduces the concept of geometric flux from spin textures as a new mechanism for persistent currents in the Kondo lattice model.

Findings

Spontaneous spin textures contribute a geometric flux.

Anomalous persistent currents occur near specific magnetic flux values.

Persistent currents depend on electron number parity.

Abstract

In this paper, we study the zero temperature persistent current in a ferromagnetic Kondo lattice model in the strong coupling limit. In this model, there are spontaneous spin textures at some values of the external magnetic flux. These spin textures contribute a geometric flux, which can induce an additional spontaneous persistent current. Since this spin texture changes with the external magnetic flux, we find that there is an anomalous persistent current in some region of magnetic flux: near Phi/Phi_0=0 for an even number of electrons and Phi/Phi_0=1/2 for an odd number of electrons.