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Phonon-Assisted Spin Current in a Hybrid System with a Single Molecular Quantum Dot System Applied with ac Magnetic Fields

Phonon-Assisted Spin Current in a Hybrid System with a Single Molecular Quantum Dot System Applied with ac Magnetic Fields

Year:    2012

Author:    Qiao Chen

Journal of Atomic and Molecular Sciences, Vol. 3 (2012), Iss. 3 : pp. 244–251

Abstract

We investigate the spin current through a molecular quantum dot (MQD) irradiated with a rotating magnetic field and an oscillating magnetic field by nonequilibrium Green's function. The rotating magnetic field rotates with the angular frequency ωr around the z-axis with the tilt angle θ, and the time-oscillating magnetic field is located in the z-axis with the angular frequency ω. Different behaviors have been shown in the presence of electron-phonon interaction (EPI) which plays a significant role in the transport. The spin current displays asymmetric behavior as the source-drain bias eV=0, novel side peaks or shoulders can be found due to the phonon absorption and emission procedure, and the negative spin current becomes stronger as the parameter g increases. However, the spin currents display the same magnitude and the same oscillation behavior in the region μ0B1>3Δ regardless of the parameter g.

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Journal Article Details

Publisher Name:    Global Science Press

Language:    English

DOI:    https://doi.org/10.4208/jams.062111.081811a

Journal of Atomic and Molecular Sciences, Vol. 3 (2012), Iss. 3 : pp. 244–251

Published online:    2012-01

AMS Subject Headings:    Global Science Press

Copyright:    COPYRIGHT: © Global Science Press

Pages:    8

Keywords:    molecular quantum dot spin-flip effect electron-phonon interaction nonequilibrium Green’s function.

Author Details

Qiao Chen Email