含带隙石墨烯纳米带的自旋筛选输运  

Spin selective transport in gapped graphene nanoribbons

作　　者：赵华 张小伟 郑勇 孟刚 ZHAO Hua;ZHANG Xiao-Wei;ZHENG Yong;MENG Gang(Schoo-of Physics and Electronics,Qiannan Normal University for Nationalities,Duyun 558000,China)

机构地区：[1]黔南民族师范学院物理与电子科学学院,都匀558000

出　　处：《原子与分子物理学报》2020年第5期702-706,共5页Journal of Atomic and Molecular Physics

基　　金：贵州省普通高等学校创新人才团队项目(201329,QNYSKYTD2018002);黔南民族师范学院科研项目(qnsy201912)。

摘　　要：利用Landauer-Büttiker公式和非平衡格林函数方法,研究了在电荷和自旋偏压共同作用下的扶手椅型石墨烯纳米带的自旋相关的电子输运性质.当系统存在两种偏压时,不同自旋的电子具有不同的偏压窗口.同时,含带隙石墨烯纳米带具有与自旋无关的导电电压阈值.通过设置适当的两种偏压值,系统可以产生易于调节的单一自旋的电流.By using the Landauer-Büttiker formula combined with the nonequilibrium Green’s function method, the spin-dependent electron transport properties through armchair graphene nanoribbons under both the charge and spin bias voltages are investigated. When both two kinds of bias voltages coexist in the system, electrons with different spin degrees have different bias voltage windows. Meanwhile, the gapped graphene nanoribbons have a threshold bias voltage of electron conducting which is spin-independent. By setting proper values of two kinds of bias voltages, the pure single spin currents can be obtained and regulated conveniently in the system.

关 键 词：石墨烯纳米带 自旋偏压 电流-电压特性 

分 类 号：O472[理学—半导体物理]