Spin-Dependent Electron Transport in an Armchair Graphene Nanoribbon Subject to Charge and Spin Biases
ZHANG Xiao-Wei** , ZHAO Hua, SANG Tian, LIU Xiao-Chun, CAI Tuo
Qiannan Normal College for Nationalities, Duyun 558000
Abstract ：We study the spin-dependent electron transport in an armchair graphene nanoribbon sample driven by both the charge and the spin biases within the tight-binding framework. By numerical calculations we give the spin-dependent currents for a fixed spin bias as a function of the charge bias. It is found that we can let only one type of spin current pass through the graphene nanoribbon for a wide range of charge bias, which is due to the difference of the bias voltage windows for different spin electrons when the charge and the spin biases coexist. Moreover, the pure spin current can be controlled via the charge bias. Our results are suggestive for developing new kinds of spin filters.
收稿日期: 2012-09-13
出版日期: 2013-03-04
:
72.25.-b
(Spin polarized transport)
73.23.-b
(Electronic transport in mesoscopic systems)
72.80.Vp
(Electronic transport in graphene)
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2013, Vol. 30 
