Model Of The Optical Stark Effect In Semiconductor Quantum Wells: Evidence For Asymmetric Dressed Exciton Bands

The influence of intense coherent omega and 2 omega laser beams on the electric properties of quantum wells is investigated. In the optical quantum-interference process, an asymmetric dressed band structure can be achieved in k space. By adjusting the relative phase and the polarization direction of the omega and 2 omega laser beams, the light-induced shift and group velocity variation in electrons and spins can be tuned. The transport effects of asymmetric dressed carriers are studied. We find that if the pseudospin Hall conductance (p-SHC) is dominated by the optically induced band mixing, the p-SHC is nearly invariable with the relative phase of the laser beams. But if the p-SHC is caused by the disorder scattering effect, it is sensitive to the relative phase of the laser beams.