Optical Control of Topological Quantum Transport in Semiconductors

TL;DR

This paper demonstrates how intense laser radiation can induce and control Hall charge and spin transport in semiconductors by transferring Berry curvature, with effects modifiable by laser intensity and disorder.

Contribution

It introduces a method to optically manipulate topological transport phenomena in semiconductors through laser-induced Berry curvature transfer.

Findings

Laser radiation activates Hall charge and spin transport in semiconductors.

Optical Hall conductance can change sign with laser intensity in disordered systems.

Berry curvature transfer enables control of topological effects via light.

Abstract

Intense coherent laser radiation red-detuned from absorption edge can reactively activate sizable Hall type charge and spin transport in n-doped paramagnetic semiconductors as a consequence of k-space Berry curvature transferred from valence band to photon-dressed conduction band. In the presence of disorder, the optically induced Hall conductance can change sign with laser intensity.