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
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.
化合物
工程与材料科学
物理与天文学
Scopus度量
年份 | CiteScore | SJR | SNIP |
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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 | ||
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