Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 2
TT 31.1: Vortrag
Donnerstag, 28. Februar 2008, 11:45–12:00, EB 202
Time-Dependent Transport Phenomena and the History Dependence of the Time-Dependent Current — •Elham Khosravi1, Stefan Kurth1, Gianluca Stefanucci2, and Eberhard Gross1 — 1Institut für Theoretische Physik, Freie Universität Berlin,Berlin, Germany — 2Department of Physics, University of Rome Tor Vergata, Rome, Italy
We propose a time-dependent approach to investigate transport phenomena within open boundary time-dependent density functional theory which is based on a numerical algorithm for the time propagation of the non-interacting time-dependent Schrödinger or Kohn-Sham equation. The algorithm is used to study time-dependent transport phenomena such as bound state oscillations, transients, AC effects, electron pumps. It has been shown [Phys. Rev. B 75, 195115 (2007)] that the presence of at least two bound states in the biased electrode-device-electrode system of non interacting electrons, leads to persistent oscillations in the total current. Here we study how the amplitude of oscillations depends on the applied bias or gate voltage and on the initial state.