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.
Yao
Wang
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Department of Physics, The University of Texas, Austin, Texas 78712, USA. wangyao@physics.utexas.edu
MacDonald
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Niu
Qian
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