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External-field-dependent enhancement of internal Coulomb interactions in time-resolved four-wave mixing

Erhöhung der externen Feldabhängigkeit von internen Coulomb-Wechselwirkungen bei zeitaufgelöstem Vier-Wellen-Mischen


Il Nuovo Cimento della societa Italiana di Fisica. D, Condensed matter, atomic, molekular and chemical physics, fluids, plasmas, biophysics 17D (1995), Nr.11/12, S.1355-1358
ISSN: 0392-6737
Fraunhofer IAF ()
heterostructure; Heterostruktur; III-V Halbleiter; III-V semiconductors; quantum-well; time resolved measurement; zeitaufgelöste Messung

Summary form only given. Time-resolved four-wave mixing (TRFWM) has been extensively used to study the influence of Coulomb interactions on the free induction decay of excitons in semiconductor quantum-well systems. We show that the ratio between the Coulomb-mediated and the pure phase space occupation signal can be changed by more than an order of magnitude by changing the external field. The experiments are performed on a high-quality GaAs-AlGaAs superlattice of 35 periods of 97-AA wells and 17-AA barriers.