Spin-flip mesoscopic transport through a quantum dot coupled to carbon nanotube terminals |
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Authors: | Email author" target="_blank">H-K?ZhaoEmail author L-N?Zhao |
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Institution: | (1) CCAST (World Laboratory), P.O. Box 8730, Beijing, 100080, P.R. China;(2) Department of Physics, Beijing Institute of Technology, Beijing, 100081, P.R. China |
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Abstract: | We investigate mesoscopic transport through a system that consists of a central quantum dot (QD) and two single-wall
carbon nanotube (SWCN) leads in the presence of a rotating
magnetic field. The spin-flip effect is induced by the rotating
magnetic field, and the tunnelling current is sensitively related
to the spin-flip effect. We present the calculations of charge
and spin current components to show the intimate relations to the
SWCN leads. Zeeman effect is important when the applied magnetic
field is strong enough. The current characteristics are quite
different when the source-drain bias is zero (eV=0) and nonzero
(eV≠0). The asymmetric peak and valley of spin current versus
gate voltage exhibit Fano resonance. Multi-resonant peaks of spin
current versus photon energy ħω reflect the structure
of CN quantum wires, as well as the resonant photon absorption and
emission effect. The matching-mismatching of channels in the CN
leads and QD results in novel spin current structure by tuning the
frequency. |
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Keywords: | |
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