Magnetically tunable spin-polarization of the current through a double quantum dot device

  • Pan H
  • Wang C
  • Duan S
 et al. 
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Abstract

We theoretically study the spin-dependent transport in a double quantum dot device connected with normal-metal and ferromagnetic leads by using the nonequilibrium Green's function method. In the absence of an external magnetic field, the current polarization is zero for a range of positive bias, while it is a relatively large value for a negative bias. In the presence of an external magnetic field perpendicular to the magnetization of the lead, the spin-flip effects make the current spin-polarized for both of the positive and negative bias. Thus the device can operate as a magnetically tunable spin-polarized current diode. © 2008 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • A. Coupled quantum dots
  • D. Coulomb-blockade
  • D. Spin-dependent transport
  • D. Spin-flip effects

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Authors

  • Hui PanUniversity of Macau

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  • Cong Wang

  • Su Qing Duan

  • Wei Dong Chu

  • Wei Zhang

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