UPS study of the electronic structure of Hg1−xCdx Te: Breakdown of the virtual crystal approximation
- 1 May 1982
- journal article
- Published by American Vacuum Society in Journal of Vacuum Science and Technology
- Vol. 21 (1) , 142-145
- https://doi.org/10.1116/1.571697
Abstract
Ultraviolet photoemission spectroscopy (UPS) with photon energies between 7 and 30 eV has been used to probe the electronic structure of cleaved (110) single‐crystal Hg1−xCdxTe (x = 0.2, 0.31, 0.39, and 1.0). Structure in the emission from the upper valence bands (within ∠3.5 eV of the valence band maximum) is qualitatively similar for the compositions studied and exhibits band‐structure‐related dispersion with photon energy. Features arising from the lower lying, mainly metal s‐electron derived states (−4 to −6 eV) correlate separately with Hg and Cd. Thus the UPS spectra give evidence of differences in the contributions of the two cations to the electronic structure and the breakdown of the virtual crystal approximation in the valence states lying about 5 eV below the valence band maximum.Keywords
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