The band structure of BeTe - a combined experimental and theoretical study

Details The band structure of BeTe - a combined experimental and theoretical study The band structure of BeTe - a combined experimental and theoretical study

1997-12-22

arxiv.org/abs/cond-mat/9712266v1

Physics

Condensed Matter

Soft Condensed Matter

21 pages plus 4 figures

Scientific paper

Using angle-resolved synchrotron-radiation photoemission spectroscopy we have determined the dispersion of the valence bands of BeTe(100) along $\Gamma X$, i.e. the [100] direction. The measurements are analyzed with the aid of a first-principles calculation of the BeTe bulk band structure as well as of the photoemission peaks as given by the momentum conserving bulk transitions. Taking the calculated unoccupied bands as final states of the photoemission process, we obtain an excellent agreement between experimental and calculated spectra and a clear interpretation of almost all measured bands. In contrast, the free electron approximation for the final states fails to describe the BeTe bulk band structure along $\Gamma X$ properly.

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