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Author Atzmueller, R. ♦ Roesch, M. ♦ Schaack, G. ♦ Becker, C. R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ HETEROJUNCTIONS ♦ RAMAN SPECTROSCOPY ♦ MERCURY TELLURIDES ♦ CADMIUM TELLURIDES ♦ ELECTRONIC STRUCTURE ♦ RESONANCE SCATTERING ♦ BACKSCATTERING ♦ CHARGE CARRIERS ♦ BAND STRUCTURE ♦ PHONON SPECTRA ♦ CONDUCTION BANDS ♦ QUANTUM WELLS
Abstract We have investigated the resonance enhancement of the Raman scattering efficiency of the TO, LO, and 2LO phonon processes in a series of HgTe/Hg{sub 0.3}Cd{sub 0.7}Te heterostructures with (001), (110), and (111) orientations at the {ital E}{sub 1} band gap. In addition, interface modes and localized defect modes have been observed. Quantum confinement effects could be detected at the {ital E}{sub 1} transition in this system and a second (excited) electronic subband was verified. For the (110) and (111) orientations, the electronic degeneracy at the {ital E}{sub 1} gap is lifted and two resonance maxima appear, in accordance with the transverse effective mass (0.145{ital m}{sub 0}) derived for a (001) grown sample. Selection rules for Raman backscattering from zinc-blende heterostructures in the vicinity of the {ital E}{sub 1} gap have been derived for deformation-potential and Fr{umlt o}hlich intraband coupling and are compared with experimental results. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-12-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 23


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