Enhanced Optical Conductivity of Bilayer Graphene Nanoribbons in the Terahertz Regime

被引：122
|
作者：
Wright, A. R. [1 ]
Cao, J. C. [2 ]
Zhang, C. [1 ]
机构：
[1] Univ Wollongong, Sch Engn Phys, Wollongong, NSW 2552, Australia
[2] Chinese Acad Sci, State Key Lab Funct Mat Informat, Shanghai Inst Microsyst & Informat Technol, Shanghai 200050, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 20期
基金：
澳大利亚研究理事会;
关键词：
BAND-STRUCTURE; SEMICONDUCTORS; GRAPHITE;
D O I：
10.1103/PhysRevLett.103.207401
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We reveal that there exists a class of graphene structures (a subclass of bilayer graphene nanoribbons) which has an exceptionally strong optical response in the terahertz (THz) and far infrared (FIR) regime. The peak conductance of THz/FIR active bilayer ribbons is around 2 orders of magnitude higher than the universal conductance of sigma(0)=e(2)/4h observed in graphene sheets. The criterion for the THz/FIR active subclass is a bilayer graphene nanoribbon with a one-dimensional massless Dirac fermion energy dispersion near the Gamma point. Our results overcome a significant obstacle that hinders the potential application of graphene in electronics and photonics.
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页数：4
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