Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Fluctuations and Noise
TT 32.5: Vortrag
Donnerstag, 29. März 2007, 19:00–19:15, H18
Bound states in time-dependent quantum transport — •Elham Khosravi1, Stefan Kurth1, Gianluca stefanucci1, Angel Rubio2, and Eberhard Gross1 — 1Institut fuer Theoretische Physik, Freie Universitaet Berlin,Berlin, Germany — 2Donostia International Physics Center(DIPC),San Sebastian,Spain
We present a description of transport based on the time evolution of the non-interacting time-dependent Schroedinger equation and develop a numerical algorithm for the time propagation of open systems which is ideally suited for implementation of time-dependent density functional theory. The algorithm is used to study time-dependent transport phenomena. In particular, we investigate the role of bound states and transients in simple model systems. The presence of two or more bound states in the biased electrode-device-electrode system leads to current oscillations that remain undamped even in the long-time limit. Such oscillations might open new conductive channels, an effect which is not accounted for in any steady-state approach.