Pseudospin ferromagnetism in double-quantum-wire systems

TL;DR

This paper predicts a pseudospin ferromagnetic state in double-quantum-wire systems under magnetic fields, characterized by inter-wire coherence, with phase boundaries analyzed via bosonization and potential experimental signatures discussed.

Contribution

It introduces the concept of pseudospin ferromagnetism in double-wire systems and analyzes the phase boundary using bosonization, a novel approach for this context.

Findings

Pseudospin ferromagnetic state exists below a critical inter-wire distance.

Phase boundary determined by softening of spin-mode velocity.

Signatures in tunneling and Coulomb drag experiments are discussed.

Abstract

We propose that a pseudospin ferromagnetic (i.e inter-wire coherent) state can exist in a system of two parallel wires of finite width in the presence of a perpendicular magnetic field. This novel quantum many-body state appears when the inter wire distance decreases below a certain critical value which depends on the magnetic field. We determine the phase boundary of the ferromagnetic phase by analyzing the softening of the spin-mode velocity using the bosonization approach. We also discuss signatures of this state in tunneling and Coulomb drag experiments.