Investigation of the spontaneous lateral modulation in short-period superlattices by grazing-incidence x-ray diffraction.
- University of Houston, Houston, TX
- Charles University, Prague, Czech Republic
- ESRF, Grenoble, France
- National Renewable Energy Laboratory, Golden, CO
- Masaryk University, Brno, Czech Republic
The process of spontaneous lateral composition modulation in short-period InAs/AlAs superlattices has been investigated by grazing-incidence x-ray diffraction. We have developed a theoretical description of x-ray scattering from laterally modulated structures that makes it possible to determine the lateral composition modulation directly without assuming any structure model. From experimental intensity distributions in reciprocal space we have determined the amplitudes of the modulation and its degree of periodicity and their dependence on the number of superlattice periods. From the data it follows that the modulation process cannot be explained by bunching of monolayer steps and most likely, it is caused by stress-driven morphological instabilities of the growing surface.
- Research Organization:
- Sandia National Laboratories
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 989374
- Report Number(s):
- SAND2005-1843J
- Journal Information:
- Proposed for publication in Physical Review B., Journal Name: Proposed for publication in Physical Review B. Journal Issue: 3 Vol. 72; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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