Volume 3, Issue 3
Phonon-Assisted Spin Current in a Hybrid System with a Single Molecular Quantum Dot System Applied with ac Magnetic Fields

Qiao Chen

J. At. Mol. Sci., 3 (2012), pp. 244-251.

Published online: 2012-03

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  • 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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COPYRIGHT: © Global Science Press

  • Email address

cqhy1127@yahoo.com.cn (Qiao Chen)

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@Article{JAMS-3-244, author = {Chen , Qiao}, title = {Phonon-Assisted Spin Current in a Hybrid System with a Single Molecular Quantum Dot System Applied with ac Magnetic Fields}, journal = {Journal of Atomic and Molecular Sciences}, year = {2012}, volume = {3}, number = {3}, pages = {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 $g.$

}, issn = {2079-7346}, doi = {https://doi.org/10.4208/jams.062111.081811a}, url = {http://global-sci.org/intro/article_detail/jams/8197.html} }
TY - JOUR T1 - Phonon-Assisted Spin Current in a Hybrid System with a Single Molecular Quantum Dot System Applied with ac Magnetic Fields AU - Chen , Qiao JO - Journal of Atomic and Molecular Sciences VL - 3 SP - 244 EP - 251 PY - 2012 DA - 2012/03 SN - 3 DO - http://doi.org/10.4208/jams.062111.081811a UR - https://global-sci.org/intro/article_detail/jams/8197.html KW - molecular quantum dot, spin-flip effect, electron-phonon interaction, nonequilibrium Green’s function. AB -

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 $g.$

Chen , Qiao. (2012). Phonon-Assisted Spin Current in a Hybrid System with a Single Molecular Quantum Dot System Applied with ac Magnetic Fields. Journal of Atomic and Molecular Sciences. 3 (3). 244-251. doi:10.4208/jams.062111.081811a
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