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Theoretical modeling of electron emission from graphene

Published online by Cambridge University Press:  10 July 2017

Y.S. Ang ,
Shi-Jun Liang  and
L.K. Ang
Y.S. Ang
Affiliation:
Singapore University of Technology and Design, Singapore; yeesin_ang@sutd.edu.sg
Shi-Jun Liang
Affiliation:
Singapore University of Technology and Design, Singapore; shijun_liang@mymail.sutd.edu.sg
L.K. Ang
Affiliation:
Singapore University of Technology and Design, Singapore; ricky_ang@sutd.edu.sg
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Abstract

The theories of thermionic emission and field emission (also known as the Richardson–Dushman [RD] and Fowler–Nordheim [FN] Laws, respectively) were formulated more than 80 years ago for bulk materials. In single-layer graphene, electrons mimic massless Dirac fermions and follow relativistic carrier dynamics. Thus, their behavior deviates significantly from the nonrelativistic electrons that reside in traditional bulk materials with a parabolic energy-momentum dispersion relation. In this article, we assert that due to linear energy dispersion, the traditional thermionic emission and field emission models are no longer valid for graphene and two-dimensional Dirac-like materials. We have proposed models that show better agreement with experimental data and also show a smooth transition to the traditional RD and FN Laws.

Keywords

thermionic emissionfield emissionnanostructure

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Type
Research Article
Information
MRS Bulletin , Volume 42 , Issue 7: Electron-Emission Materials , July 2017 , pp. 505 - 510
Copyright
Copyright © Materials Research Society 2017 

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