Subband energy in two-band delta-doped semiconductors

Details Subband energy in two-band delta-doped semiconductors Subband energy in two-band delta-doped semiconductors

1995-12-18

arxiv.org/abs/cond-mat/9512127v1

Physics

Condensed Matter

REVTeX 3.0, 10 pages, 1 figure available upon request. To apper in Physics Letters A

Scientific paper

10.1016/0375-9601(95)00976-0

We study electron dynamics in a two-band delta-doped semiconductor within the envelope-function approximation. Using a simple parametrization of the confining potential arising from the ionized donors in the delta-doping layer, we are able to find exact solutions of the Dirac-type equation describing the coupling of host bands. As an application we then consider Si delta-doped GaAs. In particular we find that the ground subband energy scales as a power law of the Si concentration per unit area in a wide range of doping levels. In addition, the coupling of host bands leads to a depression of the subband energy due to nonparabolicity effects.

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