Tunable coulomb blockade and giant coulomb blockade magnetoresistance in a double quantum dot system

Authors

  • X.-G. Zhang,

    Corresponding author
    1. Center for Nanophase Materials Sciences and Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6493
    • Center for Nanophase Materials Sciences and Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6493
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  • T. Xiang

    1. Institute of Physics, Chinese Academy of Science, P.O. Box 603, Beijing 100190, China
    2. Institute of Theoretical Physics, Chinese Academy of Science, P.O. Box 603, Beijing 100190, China
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Abstract

We propose a Hubbard model to describe the tunneling effect of electrons in a double quantum dot system connected in the parallel circuit configuration to electrodes. The change in the interdot coupling is shown to dramatically influence the Coulomb blockade (CB) properties. For magnetic double dots, the interdot coupling can be tuned by the external magnetic field, leading to a giant CB magnetoresistance. Possible detection of this effect in organic magnetic molecular systems is discussed. © 2011 Wiley Periodicals, Inc. Int J Quantum Chem, 2012

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