Journal of Russian Laser Research 34, (2013)

SCIE

COHERENT PUMP-PROBE RESPONSE OF QUANTUM WELLS: POLARIZATION DEPENDENCE

Hoang Ngoc Cam

We consider a coherent pump{probe response from quantum wells using the exciton{boson formalism approach. We obtain the mean-eld contribution and that of the biexciton as well as of a molecular scattering state in analytic form and show that each of these contributions may completely disap- pear in one or another polarization conguration of the pump and probe pulses, which makes the response strongly dependent on polarization. We apply general formulas for calculating the dier- ential absorption spectrum of quantum-well samples under excitation conditions supporting the slow exciton{exciton scattering. The obtained results are in good qualitative agreement with available experimental observations.