TITLE

Resonance Raman scattering in CdTe-ZnTe superlattices

AUTHOR(S)
Menéndez, J.; Pinczuk, A.; Valladares, J. P.; Feldman, R. D.; Austin, R. F.
PUB. DATE
April 1987
SOURCE
Applied Physics Letters;4/20/1987, Vol. 50 Issue 16, p1101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We present a resonance Raman study of strain and excitons in CdTe-ZnTe superlattices. We obtain the strain configuration of the samples from the strain-induced shifts in the Raman frequencies of confined longitudinal optical phonons. We find that CdTe-ZnTe superlattices are not always in a free-standing configuration, as previously suggested. For individual layer thicknesses of the order of 20–30 Å, our superlattices can be grown lattice matched with their Cd0.1Zn0.9Te substrates. In resonance with the fundamental gap of the superlattice, we observe an enhancement of the Raman cross section not only for CdTe phonons but also (in the samples with the thinnest layers) for phonons confined in ZnTe. This behavior can be understood in terms of a small valence-band offset.
ACCESSION #
9822691

 

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