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Coupling of exciton transitions associated with different quantum-well islands

Kopplung von Exzitonen-Übergängen an verschiedenen Quantum-Well-Inseln


Physical Review. B 48 (1993), No.15, pp.11480-11483 : Abb.,Lit.
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
Journal Article
Fraunhofer IAF ()
Quantentopf; quantum wells; time resolved photoluminescence; zeitaufgelöste Photolumineszenz

We show by means of time-resolved four-wave-mixing experiments that the simultaneous excitation of energetically distinct and inhomogenously broadened exciton transitions associated with spatially separated quantum-well islands leads to a beating photon echo. This shows that the exciton transitions cannot be described by uncoupled two-level systems. We discuss bleaching, screening, and dipole-dipole interaction as possible coupling mechanisms.