Theory of spin pumping through an interacting quantum dot tunnel coupled to a ferromagnet with time-dependent magnetization

Nina Winkler, Michele Governale, and Jürgen König
Phys. Rev. B 87, 155428 – Published 23 April 2013

Abstract

We investigate two schemes for pumping spin adiabatically from a ferromagnet through an interacting quantum dot into a normal lead that exploit the possibility to vary in time the ferromagnet's magnetization, either its amplitude or its direction. For this purpose, we extend a diagrammatic real-time technique for pumping to situations in which the leads' properties are time dependent. In the first scheme, the time-dependent magnetization amplitude is combined with a time-dependent level position of the quantum dot to establish both a charge and a spin current. The second scheme uses a uniform rotation of the ferromagnet's magnetization direction to generate a pure spin current without a charge current. We discuss the influence of an interaction-induced exchange field on the pumping characteristics.

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  • Received 1 February 2013

DOI:https://doi.org/10.1103/PhysRevB.87.155428

©2013 American Physical Society

Authors & Affiliations

Nina Winkler1, Michele Governale2, and Jürgen König1

  • 1Theoretische Physik, Universität Duisburg-Essen and CENIDE, 47048 Duisburg, Germany
  • 2School of Chemical and Physical Sciences and MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand

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Vol. 87, Iss. 15 — 15 April 2013

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