Electronic structure and band gap composition-dependence of the II-VI quaternary alloys

Details Electronic structure and band gap composition-dependence of the II-VI quaternary alloys Electronic structure and band gap composition-dependence of the II-VI quaternary alloys

1996-12-05

arxiv.org/abs/cond-mat/9612051v1

Physics

Condensed Matter

Materials Science

7 pages in RevTex, two PostScript figures upon request. also available at http://www.fis.cinvestav.mx/~daniel/PUBS/pub7.uu or

Scientific paper

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 Zn_{1-y}Cd_ySe_{1-x}Te_x and Zn_{.9}Cd_{.1}S_{.07}Se_{.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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