Optical control of topological quantum transport in semiconductors.
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.
Department of Physics, The University of Texas, Austin, Texas 78712, USA. wangyao@physics.utexas.edu
Wang
W
Yao
A H
AH
MacDonald
Qian
Q
Niu