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Spontaneous lateral modulation in short-period superlattices investigated by grazing-incidence X-ray diffraction

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CAHA Ondřej MIKULÍK Petr NOVÁK Jiří HOLÝ Václav MOSS Simon C. NORMAN Andrew

Year of publication 2005
Type Article in Periodical
Magazine / Source Physical Review B
MU Faculty or unit

Faculty of Science

Field Solid matter physics and magnetism
Keywords lateral modulation; superlattices; x-ray diffraction
Description 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.
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