Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 5: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts - Part 1
TT 5.6: Vortrag
Montag, 27. März 2006, 11:00–11:15, HSZ 304
Electron pumping in periodic fields — •Stefan Kurth1, Angel Rubio2, and E.K.U. Gross1 — 1Institute for Theoretical Physics, Free University Berlin, Berlin, Germany — 2Donostia International Physics Center, San Sebastian/Donostia, Spain
Using our recently developed algorithm for the time-dependent description of transport(Phys. Rev. B 72,035308 (2005)) we study pumping of electrons between two reservoirs at the same chemical potential. Pumping is achieved by applying a spatially inhomogeneous perturbation which is periodic in time. The flexibility of the algorithm, which is based on the time evolution of the Schrödinger equation, allows us to study pumping in the linear and nonlinear, adiabatic and non-adiabatic regimes. For perturbations with the shape of a travelling wave, electrons are transferred in packets moving with the minima of the wave.