Electronic structure and band gap composition-dependence of the II-VI quaternary alloys
A. E. Garcia, A. Zepeda-Navratil, A. Camacho, D. Olguin, R. Baquero
Abstract
Based on a successful description of II-VI ternary alloys, which introduces an empirical bowing parameter to the widely used virtual crystal approximation, we set up a tight-binding Hamiltonian to describe the Zn1-yCdySe1-xTex and Zn.9Cd.1S.07Se.93 quaternary alloys. We just use a formula that can be thought as a straightforward generalization of the virtual crystal approximation for this case. Our Hamiltonians reproduce very well the change in the band gap value with the composition observed in recent experimental reports.
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