Optical control of topological quantum transport in semiconductors

Phys Rev Lett. 2007 Jul 27;99(4):047401. doi: 10.1103/PhysRevLett.99.047401. Epub 2007 Jul 24.

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 the valence band to the photon-dressed conduction band. In the presence of disorder, the optically induced Hall conductance can change sign with laser intensity.