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Group theory of electron states in quantum wells and heterostructures

✍ Scribed by S. Jorda; U. Rössler

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
306 KB
Volume
8
Category
Article
ISSN
0749-6036

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✦ Synopsis

A group-theoretical classification of confined electron states in semiconductor quantum wells and heterostructures is presented. It exploits the possible decomposition of an 8 x 8 k.p Hamiltonian for the conduction-valence band complex into terms of axial, cubic and tetrahedral symmetry. Taking into account only the axial terms, we obtain a unique classification scheme for conduction, valence and split-off subbands and give selection rules for optical intra-and intersubband transitions. These selection rules become relaxed due to the symmetry breaking effect of cubic and tetrahedral terms.

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We oresent a calculation of the Auger recombination rate for the CHCC process in a model of a auantum well heterostructure. The calculation differs frcm the bulk Auger calculations because carriers trapped in the quantum wells reside within sub-bands associated with the different bound states of th