TITLE

Pressure Dependence of Intersubband Transitions in HgTe/Hg0.3Cd0.7Te Superlattices

AUTHOR(S)
Becker, C. R.; Latussek, V.; Landwehr, G.; Bini, R.; Ulivi, L.
PUB. DATE
June 2005
SOURCE
Journal of Electronic Materials;Jun2005, Vol. 34 Issue 6, p811
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The optical absorption coefficient of HgTe/Hg0.3Cd0.7Te superlattices (SLs) and its pressure dependence has been investigated at hydrostatic pressures up to 30 kbar at room temperature. The corresponding intersubband transition energies result from a comparison of experimental and theoretical absorption coefficients. The latter is based on the band structure, which is calculated using Kane's four-band (8 x 8 k · p) model together with the envelope function approximation. The experimental linear pressure coefficients of the H1 - E1 and H1 - L1 intersubband transitions are in good agreement with the theoretical values, e.g., 7.15 ± 0.3 meV/kbar and 6.2 ± 0.3 meV/kbar compared to 7.4 and 6.4 meV/kbar, respectively. This is in stark contrast to the pressure dependence of ≤1 meV/kbar of the photoluminescence (PL) peaks of a similar SL reported in the literature. Consequently, we conclude that the reported PL peaks are not due to intersubband transitions and that the k · p model correctly reproduces the electronic band structure and its pressure dependence of HgTe/Hg1-xCdxTe SLs.
ACCESSION #
17529315

 

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