Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 11: Transport: Nanoelectronics I - Quantum Dots and Wires, Point Contacts 2

TT 11.5: Vortrag

Montag, 23. März 2009, 15:00–15:15, HSZ 301

A time dependent approach to obtain transmission coefficients of multi-terminal devices — •Christoph Kreisbeck¹, Viktor Krückl¹, and Tobias Kramer^1,2 — ¹Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany — ²Department of Physics, Harvard University, Cambridge, MA 02138, USA

We are interested in the transport behavior of semiconductor nanostructures, where we particularly focus on multi-terminal devices. The conductivity through these devices can be described theoretically within the Landauer-Büttiker formalism, which connects conductance-voltage characteristics with scattering matrices. To obtain the latter we introduce a time dependent approach, which proves to be a very efficient way to calculate transmission coefficients numerically. Moreover this method can go beyond Landauer-Büttiker. This means that we do not have to restrict ourself to asymptotic channels anymore, but we can study localised electron sources as well.