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HL: Halbleiterphysik

HL 12: Poster I

HL 12.91: Poster

Montag, 8. März 2004, 16:30–19:00, Poster A

The Boltzmann Equation in Semiconductor Superlattices — •Bernhard Rieder and Joachim Keller — Institute of Theoretical Physics, University of Regensburg, 93040 Regensburg

We model the electron motion in semiconductor superlattices with the help of the Boltzmann equation in the relaxation time approximation. A smooth transition from the superlattice to the bulk region of the semiconductor material is assumed. We derive corrections to the Boltzmann equation in this transition region, because the model of the boundaries is crucial for the behavior of the system. Instabilities, which hindered the application of the superlattices as TeraHertz-source up to now, will develop there. In experiments these instabilities lead to periodic behavior of the system. Up to now no realistic model including the boundaries was set up which reproduces this behavior. With our model we find periodic behavior and investigate the effect of the electric circuit which is coupled to the superlattice.