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 $\omega_r$ around the $z$-axis with the tilt angle $\theta$, and the time-oscillating magnetic field is located in the z-axis with the angular frequency $\omega$. 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 $\mu_0B_1>3\Delta$ 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.