Coupling of exciton transitions associated with different quantum-well islands
Authors:
- M. KochMKM. Koch
- J. FeldmannJFJ. Feldmann
- E. O. GöbelEGE. O. Göbel
- P. ThomasPTP. Thomas
- J. ShahJSJ. Shah
- K. KöhlerKKK. Köhler
- 15 October 1993
- journal article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 48 (15) , 11480-11483
Abstract
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 mechanismsKeywords
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