Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 1

TT 20.1: Hauptvortrag

Dienstag, 26. Februar 2008, 14:00–14:30, EB 202

Adiabatic pumping in nanostructures — •Michele Governale — Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44780 Bochum, Germany

A DC current can be driven through a mesoscopic conductor in the absence of an applied transport voltage by changing periodically in time some of the properties of the conductor. This transport mechanism is known as pumping. If the time-dependent parameters vary slowly as compared to the characteristic internal time scales of the system, pumping is adiabatic, and the average transmitted charge per cycle depends only on the area of the cycle but not on its detailed timing.

In this talk we present the main theoretical concepts in the field and describe some recent developments, such as pumping trough interacting systems [1,2] and in hybrid superconducting-normal structures [3].

[1] J. Splettstoesser, M. Governale, J. König, and R. Fazio, Phys. Rev. Lett. 95, 246803 (2005).

[2] J. Splettstoesser, M. Governale, J. König, and R. Fazio, Phys. Rev. B 74, 085305 (2006).

[3] M. Governale, F. Taddei, R. Fazio, and F. W. J. Hekking, Phys. Rev. Lett. 95, 256801 (2005).