Physics – Condensed Matter
Scientific paper
2002-06-23
Physics
Condensed Matter
4 pages, 5 figures
Scientific paper
10.1103/PhysRevLett.89.157402
Variations in the width of a quantum well (QW) are known to be a source of broadening of the exciton line. Using low temperature near-field optical microscopy, we have exploited the dependence of exciton energy on well-width to show that in GaAs QWs, these seemingly random well-width fluctuations actually exhibit well-defined order -- strong long-range correlations appearing laterally, in the plane of the QW, as well as vertically, between QWs grown one on top of the other. We show that these fluctuations are correlated with the commonly found mound structure on the surface. This is an intrinsic property of molecular beam epitaxial growth.
Bar-Joseph Israel
Esser Alexander
Rappaport Michael
Shtrikman Hadas
Umansky Vladimir
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