Anomalous transport in pseudospin-1 fermions

TL;DR

This paper investigates how magnetic fields and disorder affect electronic transport in pseudospin-1 fermions, revealing anomalous Hall effects and variable magnetoresistance, with implications for future experiments.

Contribution

It demonstrates the impact of orbital magnetic moments on transport properties in the gapped $eta- ext{T}_3$ model, highlighting valley symmetry breaking and anomalous Hall conductivity.

Findings

Magnetic field coupling causes valley symmetry breaking.

Orbital magnetic moments induce measurable Hall conductivity.

Magnetoresistance can be positive or negative depending on disorder.

Abstract

Electronic transport in the $\alpha-\mathcal{T}_3$ model of pseudospin-1 fermions with a finite gap is studied within the semiclassical Boltzmann approximation. We show that coupling of the orbital magnetic moment to the external magnetic field, which is otherwise absent in the massless model, breaks valley symmetry, results in finite and measurable corrections to the longitudinal and Hall conductivity, and yields anomalous Hall conductivity due to the Berry curvature. We also show that, remarkably, magnetoresistance induced by the orbital magnetic moment can be either positive or negative; the sign depends on the amount of disorder, and is different for both conventional and anomalous contributions to the magnetoresistance. Recent material advances and upcoming experiments on cold atoms that may realize pseudospin-1 fermions makes our study timely and appropriate.