Angle-resolved photo-emission from the cleaved (110) surface of cadmium telluride

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Abstract
Angle-resolved photo-emission studies have been carried out for the (110) cleaved surface of cadmium telluride, using He I radiation (21.2 eV) as the light source. The experimental peak dispersions have been mapped for two major symmetry directions namely, Gamma X' (001) and Gamma X (100) of the two-dimensional surface Brillouin zone. Good agreement has been obtained between peak positions observed experimentally and those determined by a one-dimensional joint density of states (ODJDOS) calculation based on the authors' semi-empirical nonlocal pseudopotential scheme. Specifically, they account for all the prominent emission features due to bulk valence band states in terms of k-conserving optical transitions. It has also been demonstrated that the experimental bulk emission peak positions and intensities may be successfully explained in a first-order approximation, in terms of the three-step model based on the nonlocal pseudopotential theory for initial and final states. The contribution from surface states on the (110) cleaved surface of cadmium telluride is also discussed.