Dynamics of Electrons in Graded Semiconductors

Details Dynamics of Electrons in Graded Semiconductors Dynamics of Electrons in Graded Semiconductors

1996-12-04

arxiv.org/abs/cond-mat/9612049v1

Physics

Condensed Matter

4 pages, Revtex

Scientific paper

10.1103/PhysRevLett.78.110

I present a theory of electron dynamics in semiconductors with slowly varying composition. I show that the frequency-dependent conductivity, required for the description of transport and optical properties, can be obtained from a knowledge of the band structures and momentum matrix elements of homogeneous semiconductor alloys. New sum rules for the electronic oscillator strengths, which apply within a given energy band or between any two bands, are derived, and a general expression for the width of the intraband absorption peak is given. Finally, the low-frequency dynamics is discussed, and a correspondence with the semiclassical motion is established.

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