Spin-twist driven persistent current in a strongly correlated two-dimensional electron system: a manifestation of the gauge field

TL;DR

This paper demonstrates a spin-twist driven persistent current in a strongly correlated 2D electron system, highlighting the role of gauge fields arising from spin configurations and electron-electron interactions.

Contribution

It reveals a novel persistent current mechanism linked to gauge fields in a strongly correlated 2D electron system with Nagaoka's ferromagnetic state.

Findings

Persistent current exists in 2D Nagaoka's ferromagnetic state.

Gauge field effects from spin configurations influence hole motion.

Electron-electron interactions significantly affect spin-related phenomena.

Abstract

A persistent current, coupled with the spin state, of purely many-body origin is shown to exist in Nagaoka's ferromagnetic state in two dimensions (2D). This we regard as a manifestation of a gauge field, which comes from the surrounding spin configuration and acts on the hole motion, being coupled to the Aharonov-Bohm flux. This provides an example where the electron-electron interaction exerts a profound effect involving the spins in clean two-dimensional lattice systems in sharp contrast to continuum or spinless fermion systems.