DocumentCode :
1423130
Title :
Dynamic Conductivity of Graphene in a Terahertz AC Electric Field
Author :
Liu, S.Y. ; Horing, Norman J M ; Lei, X.L.
Author_Institution :
Dept. of Phys., Shanghai Jiaotong Univ., Shanghai, China
Volume :
10
Issue :
3
fYear :
2010
fDate :
3/1/2010 12:00:00 AM
Firstpage :
681
Lastpage :
685
Abstract :
Recently, graphene has received a great deal of attention both experimentally and theoretically because of its unusually device-friendly material properties, including high mobility, high electron density, and long-carrier mean-free-path, etc. It has also been shown that graphene-based chemical sensors are capable of detecting minute concentrations (1 part per billion) of various active gases due to its high sensitivity. We consider the role of interband coherence in a kinetic equation approach to the analysis of transport in graphene with long-range electron-impurity scattering for an ac electric field in terahertz regime. We find that there is a minimum conductivity in the electron-density dependence of conductivity when the frequency of the ac electric field ?? is less than a critical value ??0. For ?? > ??0, the conductivity monotonically decreases with decreasing electron density. The dependence of ??0 on the form of the electron-impurity scattering potential is examined.
Keywords :
electrical conductivity; electron mobility; graphene; chemical sensors; electron impurity scattering; graphene dynamic conductivity; interband coherence; kinetic equation; terahertz AC electric field; Dynamic conductivity; graphene; terahertz (THz) electric field;
fLanguage :
English
Journal_Title :
Sensors Journal, IEEE
Publisher :
ieee
ISSN :
1530-437X
Type :
jour
DOI :
10.1109/JSEN.2009.2039544
Filename :
5418835
Link To Document :
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