Interface disorder and inhomogeneous broadening of quantum well excitons: Do narrow lines always imply high-quality interfaces?

Ponomarev, I. V.; Deych, L. I.; Lisyansky, A. A.
September 2004
Applied Physics Letters;9/27/2004, Vol. 85 Issue 13, p2496
Academic Journal
It is a commonly assumed that narrow lines in absorption or luminescence of quantum well excitons at low temperatures indicates high quality of quantum well interfaces. We show, that at least for narrow quantum wells, this is not always the case. Correlations between morphological fluctuations of two interfaces confining a quantum well, which were neglected in previous studies of exciton line shape, strongly suppress an inhomogeneous broadening due to interface disorder.


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