Spin-dependent transport through quantum dot with
inelastic interactions |
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Authors: | G-Y Sun C-X Wu Y Chen Z-L Yang |
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Institution: | (1) Department of Physics, Xiamen University, Xiamen, 361005, P.R. China |
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Abstract: | Using the Keldysh nonequilibrium Green function method, we
theoretically investigate the electron transport properties of a
quantum dot coupled to two ferromagnetic electrodes, with
inelastic electron-phonon interaction and spin flip scattering
present in the quantum dot. It is found that the electron-phonon
interaction reduces the current, induces new satellite polaronic
peaks in the differential conductance spectrum, and at the same
time leads to oscillatory tunneling magnetoresistance effect. Spin
flip scattering suppresses the zero-bias conductance peak and
splits it into two, with different behaviors for parallel and
anti-parallel magnetic configuration of the two electrodes.
Consequently, a negative tunneling magnetoresistance effect may
occur in the resonant tunneling region, with increasing spin flip
scattering rate. |
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Keywords: | 72 25 -b Spin polarized transport 73 40 Gk Tunneling 73 63 Kv Quantum dots |
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