Long-range order and segregation in semiconductor superlattices

Date

1987

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Source Title

Physical Review Letters

Print ISSN

0031-9007

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58

Issue

20

Pages

2114 - 2117

Language

English

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Abstract

Results of self-consistent energy-minimization calculations provide strong evidence that the ordered phases in epitaxially grown Ga1-xAlxAs and strained Si1-xGex alloys are metastable, in the sense that segregation into constituents is favored. We show that the long-range order in intermediate metastable structures leads to significant changes in the electronic properties of semiconductor superlattices. Segregation gives rise to micro-quantum-wells with staggered band lineup and multiple confined states in the potential barrier. © 1987 The American Physical Society.

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