Guided modes and quantum Goos-Hanchen shift in graphene waveguide: Influence of a velocity barrier

被引：18
|
作者：
Wang, Y. [1 ]
Liu, Y. [2 ]
Wang, B. [1 ]
机构：
[1] Sun Yat Sen Univ, Sch Phys & Engn, Guangzhou 510275, Guangdong, Peoples R China
[2] Sun Yat Sen Univ, Sch Engn, Guangzhou 510275, Guangdong, Peoples R China
来源：
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2013年 / 48卷
关键词：
MASSLESS DIRAC FERMIONS;
D O I：
10.1016/j.physe.2013.01.008
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The influence of velocity on the guided modes, localized current density inside the channel and the Goos-Hanchen shift at the interface of graphene waveguide in the presence of a velocity barrier is investigated theoretically. It is found that each guided mode has a cutoff velocity determining the appearance of the oscillating wave mode and the velocity in the barrier regions can control the number of guided modes and the distribution of localized current density inside the channel. The number of guided modes and the conduction of graphene waveguide along the channel present a quantized feature for velocity. Finally, it is also indicated that the Goos-Hanchen shift at the interface of graphene waveguide can be well controlled by changing the velocity in barrier region. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：191 / 197
页数：7
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