Aspects of Anisotropic Fractional Quantum Hall Effect in Phosphorene

TL;DR

This paper investigates how anisotropic energy bands in phosphorene influence fractional quantum Hall effects, revealing unique collective modes and potential experimental signatures in light scattering.

Contribution

It provides the first analysis of anisotropic effects on fractional quantum Hall states in phosphorene, highlighting novel collective modes and their experimental observability.

Findings

Fractional quantum Hall gap is larger in phosphorene than in conventional semiconductors.

Magnetoroton mode splits into two branches with minima due to anisotropy.

A second positive dispersion mode appears, separated from the magnetoroton mode.

Abstract

We have analyzed the effects of the anisotropic energy bands of phosphorene on magnetoroton branches for electrons and holes in the two Landau levels close to the band edges. We have found that the fractional quantum Hall effect gap in the lowest (highest) Landau level in conduction (valance) band is slightly larger than that for conventional semiconductor systems and therefore experimentally observable. We also found that the magnetoroton mode for both electrons and holes consists of two branches with two minima due to the anisotropy. Additionally, we show that due to the anisotropy, there is a second mode with positive dispersion, well separated from the magnetoroton mode for small wave vectors. These novel features of the collective mode can be observed in resonant inelastic light scattering experiments.