Chiral Tunneling in a Twisted Graphene Bilayer

被引：73
作者：
He, Wen-Yu [1 ]
Chu, Zhao-Dong [1 ]
He, Lin [1 ]
机构：
[1] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 06期
基金：
美国国家科学基金会;
关键词：
MASSLESS DIRAC FERMIONS; INTERFERENCE; FIELD;
D O I：
10.1103/PhysRevLett.111.066803
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The perfect transmission in a graphene monolayer and the perfect reflection in a Bernal graphene bilayer for electrons incident in the normal direction of a potential barrier are viewed as two incarnations of the Klein paradox. Here we show a new and unique incarnation of the Klein paradox. Owing to the different chiralities of the quasiparticles involved, the chiral fermions in a twisted graphene bilayer show an adjustable probability of chiral tunneling for normal incidence: they can be changed from perfect tunneling to partial or perfect reflection, or vice versa, by controlling either the height of the barrier or the incident energy. As well as addressing basic physics about how the chiral fermions with different chiralities tunnel through a barrier, our results provide a facile route to tune the electronic properties of the twisted graphene bilayer.
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页数：5
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