Journal
NANO RESEARCH
Volume 5, Issue 10, Pages 667-678Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-012-0251-0
Keywords
Single-layer graphene; terahertz; conductance; multilayer graphene; broadband
Categories
Funding
- Army Research Office [MURI W911NF-11-1-0024, ARO W911NF-09-1-0319, DURIP W911NF-11-1-0315]
- Ministerio de Educacion y Ciencia (FPU) [Consolider CSD2008-0068]
- Ministerio de Educacion y Ciencia [Consolider CSD2008-0068]
- Direct For Mathematical & Physical Scien [0960179] Funding Source: National Science Foundation
- Division Of Chemistry [0960179] Funding Source: National Science Foundation
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The magnitude of the optical sheet conductance of single-layer graphene is universal, and equal to e (2)/4A (where 2 pi A = h (the Planck constant)). As the optical frequency decreases, the conductivity decreases. However, at some frequency in the THz range, the conductivity increases again, eventually reaching the DC value, where the magnitude of the DC sheet conductance generally displays a sample- and doping-dependent value between similar to e (2)/h and 100 e (2)/h. Thus, the THz range is predicted to be a non-trivial region of the spectrum for electron transport in graphene, and may have interesting technological applications. In this paper, we present the first frequency domain measurements of the absolute value of multilayer graphene (MLG) and single-layer graphene (SLG) sheet conductivity and transparency from DC to 1 THz, and establish a firm foundation for future THz applications of graphene.
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