Measurement of the Optical Conductivity of Graphene

被引：1418

作者：

Mak, Kin Fai ^{[1
]}

Sfeir, Matthew Y. ^{[2
]}

Wu, Yang ^{[1
]}

Lui, Chun Hung ^{[1
]}

Misewich, James A. ^{[2
]}

Heinz, Tony F. ^{[1
]}

机构：

[1] Columbia Univ, Dept Phys & Elect Engn, New York, NY 10027 USA

[2] Brookhaven Natl Lab, Upton, NY 11973 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.101.196405

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Optical reflectivity and transmission measurements over photon energies between 0.2 and 1.2 eV were performed on single-crystal graphene samples on a SiO2 substrate. For photon energies above 0.5 eV, graphene yielded a spectrally flat optical absorbance of (2.3 +/- 0.2)%. This result is in agreement with a constant absorbance of pi alpha, or a sheet conductivity of pi e(2)/2h, predicted within a model of noninteracting massless Dirac fermions. This simple result breaks down at lower photon energies, where both spectral and sample-to-sample variations were observed. This "nonuniversal" behavior is explained by including the effects of doping and finite temperature, as well as contributions from intraband transitions.

引用

页数：4

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