Drude conductivity of Dirac fermions in graphene

Jason Horng;Chi Fan Chen;Baisong Geng;Caglar Girit;Yuanbo Zhang;Zhao Hao;Hans A. Bechtel;Michael Martin;Alex Zettl;Michael F. Crommie;元壤 沈;Feng Wang

University of California at Berkeley;Fudan University;Lawrence Berkeley National Laboratory;China Association for Science and Technology

发表时间:2011-4-15

期 刊:Physical Review B - Condensed Matter and Materials Physics

语 言:English

U R L: http://www.scopus.com/inward/record.url?scp=79957556922&partnerID=8YFLogxK

摘要

Electrons moving in graphene behave as massless Dirac fermions, and they exhibit fascinating low-frequency electrical transport phenomena. Their dynamic response, however, is little known at frequencies above one terahertz (THz). Such knowledge is important not only for a deeper understanding of the Dirac electron quantum transport, but also for graphene applications in ultrahigh-speed THz electronics and infrared (IR) optoelectronics. In this paper, we report measurements of high-frequency conductivity of graphene from THz to mid-IR at different carrier concentrations. The conductivity exhibits Drude-like frequency dependence and increases dramatically at THz frequencies, but its absolute strength is lower than theoretical predictions. This anomalous reduction of free-electron oscillator strength is corroborated by corresponding changes in graphene interband transitions, as required by the sum rule.

相关科学

材料科学
电子、光学和磁性材料
物理学和天文学
凝聚态物理学

文献指纹

化合物

Fermions

Graphite

Electrons

Infrared radiation

Carrier concentration

Optoelectronic devices

Dynamic response

Electronic equipment

工程与材料科学

Fermions

Graphene

Electrons

Infrared radiation

Carrier concentration

Optoelectronic devices

Dynamic response

Electronic equipment

物理与天文学

graphene

fermions

conductivity

dynamic response

oscillator strengths

sum rules

free electrons

electrons

low frequencies

predictions

electronics

被引量

期刊度量

Scopus度量

年份 CiteScore SJR SNIP
1996
1997
1998
1999 2.789
2000 2.786
2001 3.132
2002 2.678
2003 2.184
2004 2.012
2005 2.126
2006 2.62
2007 2.892
2008 2.923
2009 3.107
2010 3.318
2011 6.4 3.326
2012 6.6 3.173
2013 6.9 2.813
2014 7 2.762
2015 6.8 2.377
2016 8.6 2.339
2017 1.604
2018 1.503
2019
2020

相似文献推荐