Kondo effect in a deformed molecule coupled asymmetrically to ferromagnetic electrodes |
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| Authors: | Wang Rui-Qiang and Jiang Kai-Ming |
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| Affiliation: | Laboratory of Quantum Information Technology, Institute for Condensed Matter Physics, and School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China; Department of Physics, Shanghai Maritime University, Shanghai 201306, China |
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| Abstract: | The nonequilibrium Kondo effect is studied in a moleculequantum dot coupled asymmetrically to two ferromagnetic electrodesby employing the nonequilibrium Green function technique. Thecurrent-induced deformation of the molecule is taken into account,modeled as interactions with a phonon system, andphonon-assisted Kondo satellites arise on both sides of the usual mainKondo peak. In the antiparallel electrode configuration, theKondo satellites can be split only for the asymmetric dot-leadcouplings, distinguished from the parallel configuration wheresplitting also exists, even though it is for symmetric case. We alsoanalyze how to compensate the splitting and restore the suppressedzero-bias Kondo resonance. It is shown that one can change the TMRratio significantly from a negative dip to a positive peak only byslightly modulating a local external magnetic field, whose value isgreatly dependent on the electron--phonon coupling strength. |
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| Keywords: | Kondo effect molecular spintronics tunnelingmagnetoresistance electron--phonon interaction nonequilibriumGreen function |
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