Theory of coherent effects in semiconductors
1999; Elsevier BV; Volume: 83-84; Linguagem: Inglês
10.1016/s0022-2313(99)00065-4
ISSN1872-7883
AutoresStefan Koch, C. Sieh, T. Meier, F. Jahnke, Andreas Knorr, P. Brick, Matthias Hübner, C. Ell, J. P. Prineas, G. Khitrova, H. M. Gibbs,
Tópico(s)Semiconductor Quantum Structures and Devices
ResumoA microscopic theory is applied to discuss coherent excitation effects in semiconductors. The theory is evaluated to analyze ultrafast absorption changes around the exciton resonance in semiconductor quantum-well structures where the relative strength of the different many-body contributions can be manipulated by proper selection of pump and probe polarizations. For two-band systems and oppositely circular polarization it is shown that Coulombic correlation dynamics dominates the optical response. As a consequence, the optical Stark effect in this configuration corresponds to a red shift of the exciton resonance in striking contrast to the usual atomic-like blue shift. The predictions are confirmed by experiments using high-quality InGaAs quantum-well systems.
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