Regensburg 2000 – scientific programme
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HL: Halbleiterphysik
HL 38: Poster III: Transporteigenschaften (1-14), Optische Eigenschaften (15-31), Grenz-/Oberfl
ächen (32-44), Heterostrukturen (45-57), Bauelemente (58-67), Gitterdynamik (68-69), Diamant (70), Raster-Tunnel-Mikroskopie (71)
HL 38.6: Poster
Thursday, March 30, 2000, 14:00–19:00, B
Resonances in two-dimensional electron waveguides — •Markus Lischka1, Daniel Boese2, and Linda Reichl3 — 1Physik-Department T30, Technische Universität München, 85747 Garching — 2Institut für Theoretische Festkörperphysik, Universität Karlsruhe, 76128 Karlsruhe — 3Center for Studies in Statistical Mechanics and Complex Systems, The University of Texas at Austin, Austin, TX 78712, USA
We study the conductance properties of a straight two-dimensional electron waveguide with an s-like scatterer modeled by a single δ-function potential with a finite number of modes. Even such a simple system exhibits interesting resonance phenomena. These resonances are explained in terms of quasi-bound states both by using a direct solution of the Schrödinger equation and by studying the Green’s function of the system. Using the Green’s function we calculate the survival probability as well as the power absorption and show the influence of the quasi-bound states on these two quantities. In addition we demonstrate that a poor man’s scaling approach yields very good results and that it can help to drastically reduce the necessary computing power.