Electrical-Controlled Transport for Surface States in a Dirac Semimetal Quantum Wire

The transport properties of a Dirac semimet~l quantum wire with two side gates are theoretically studied by adopting the lattice Green function method. It is found that a residual conductance quantum contributed from the surface states can be switched on or off by tuning the electron energy or the s...

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Published inChinese physics letters Vol. 32; no. 12; pp. 117 - 120
Main Author 肖贤波 刘正方 何扬名 李会丽 艾国平 杜琰
Format Journal Article
LanguageEnglish
Published 01.12.2015
Subjects
半金属
格林函数方法
狄拉克
电气控制
纳米电子器件
表面态
运输
量子线
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/32/12/127302

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Summary:The transport properties of a Dirac semimet~l quantum wire with two side gates are theoretically studied by adopting the lattice Green function method. It is found that a residual conductance quantum contributed from the surface states can be switched on or off by tuning the electron energy or the side gates voltage. This ideal switching effect for the surface Dirac electron results from the transversal quantum confinement of the quantum wire in combination with the electrostatic potential induced by the side gates. These findings may provide useful guidance for designing all-electrical topological nanoelectronic devices.
Bibliography:11-1959/O4
The transport properties of a Dirac semimet~l quantum wire with two side gates are theoretically studied by adopting the lattice Green function method. It is found that a residual conductance quantum contributed from the surface states can be switched on or off by tuning the electron energy or the side gates voltage. This ideal switching effect for the surface Dirac electron results from the transversal quantum confinement of the quantum wire in combination with the electrostatic potential induced by the side gates. These findings may provide useful guidance for designing all-electrical topological nanoelectronic devices.
XIAO Xian-Bo, LIU Zheng-Fang, HE Yang-Ming, LI Hui-Li, AI Guo-Ping, DU Yan（1.School of Computer Science, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004; 2.School of Basic Science, East China diaotong University, Nanchang 330013）
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/12/127302