Spin-Filtering Transport in Double Parallel Quantum Wires on a Graphene Sheet  

作　　者：羊富彬 程艳 柳福提 陈向荣 蔡灵仓 

机构地区：[1]Institute of Atomic and Molecular Physics,College of Physical Science and Technology,Sichuan University [2]Department of Physics,College of Computer,Civil Aviation Flight University of China [3]School of Electrical,Computer and Energy Engineering,Arizona State University [4]Key Laboratory of High Energy Density Physics and Technology of Ministry of Education,Sichuan University [5]Institute of Fluid Physics,Chinese Academy of Engineering Physics

出　　处：《Communications in Theoretical Physics》2015年第3期385-390,共6页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos.11174214,11204192;the NSAF Joint Fund Jointly set up by the National Natural Science Foundation of China;the Chinese Academy of Engineering Physics under Grant Nos.U1230201and U1430117

摘　　要：We theoretically investigate the spin filtering transport of double parallel quantum wires(QWs) side-coupled to a grapheme sheet and sandwiched between two ferromagnetic(FM) leads.The dependences of the wire-graphene coupling strength,wire-wire coupling strength,as well as the spin polarization of the ferromagnetic leads are studied.It is found that the wire-graphene coupling strength tends to reduce the current and the wire-wire coupling strength can first reinforce and then decrease the current.The spin polarization strength has an enhanced(identical) effect on the current under the parallel(anti-parallel) alignment of the FM leads,which gives rise to an obvious spin-filter and tunnel magnetoresistance(TMR) effect.Our results suggest that such a theoretical model can stimulate some experimental investigations about the spin-filter devices.

关 键 词：spin-filter effect double parallel quantum wires spin polarization strength GRAPHENE 

分 类 号：O469[理学—凝聚态物理]