The Unconventional Transport Properties of Dirac Fermions in Graphyne

被引：5
|
作者：
Lin Xin [1 ]
Wang Hai-Long [1 ]
Pan Hui [1 ]
Xu Huai-Zhe [1 ]
机构：
[1] Beihang Univ, Dept Phys, State Key Lab Software Dev Environm, Beijing 100191, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 2013年 / 30卷 / 07期
基金：
中国国家自然科学基金;
关键词：
BERRYS PHASE; CARBON;
D O I：
10.1088/0256-307X/30/7/077305
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A two-band Hamiltonian for beta-graphyne is derived by the k.p method. The energy dispersions around the Dirac points are analytically obtained depending on the relative amplitude of the hopping terms t(1)/t(2), and the Dirac cones are elliptical when -2 < t(1)/t(2) < -1. This anisotropic Dirac Hamiltonian leads to electron current direction misalignment with the wave vector, and the transmission spectrum is asymmetric about the incident angle of current, j. This interesting feature is useful for direction-dependent wave filter devices.
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页数：4
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