Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 2

TT 31.1: Talk

Thursday, February 28, 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.