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Imaging the Evolution of Lateral Composition Modulation in Strained Alloy Superlattices
2004
Physical Review Letters
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Scanning tunneling microscopy is used to investigate the morphological evolution of GaAs=InAs short period superlattice structures. The layers of the superlattice, either grown in compression or tension, exhibit an island or trench morphology. With increasing film thickness, the islands or trenches grow in size and develop a characteristic spacing along [110] of 150 A. This is the first experimental evidence to suggest that lateral composition modulation arises from both thickness variations of
doi:10.1103/physrevlett.92.056101
pmid:14995319
fatcat:eqhphbwjcjd25cox4eew4hxuwq