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

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.

11 pages, typeset using Revtex 3.0, Phys. Rev. B in press, 2 figures available upon request at kabe@issp.u-tokyo.ac.jp