Nonadiabatic Two-Parameter Charge and Spin Pumping in a Quantum Dot

Matthias Braun and Guido Burkard
Phys. Rev. Lett. 101, 036802 – Published 15 July 2008

Abstract

We study dc charge and spin transport through a weakly coupled quantum dot, driven by a nonadiabatic periodic change of system parameters. We generalize the model of Tien and Gordon to simultaneously oscillating voltages and tunnel couplings. When applying our general result to the two-parameter charge pumping in quantum dots, we find interference effects between the oscillations of the voltage and tunnel couplings. We show that these interference effects may explain recent measurements in metallic islands. Furthermore, we discuss the possibility to electrically pump a spin current in presence of a static magnetic field.

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  • Received 1 February 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.036802

©2008 American Physical Society

Authors & Affiliations

Matthias Braun and Guido Burkard

  • Institute of Theoretical Physics C, RWTH Aachen University, D-52056 Aachen, Germany

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Issue

Vol. 101, Iss. 3 — 18 July 2008

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