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 - <p style="text-align: justify;">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&#39;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 $\mu_0B_1&gt;3\Delta$ regardless of the parameter $g.$</p>