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A Tight-Binding Hamiltonian for Band Structure and Carrier Transport in Graphene Nanoribbons

Published online by Cambridge University Press:  01 February 2011

Daniel Finkenstadt ,
Gary Pennington  and
Michael J Mehl
Daniel Finkenstadt
Affiliation:
[email protected], U.S. Naval Research Laboratory, Code 6390, 4555 Overlook Ave. SW, Washington, DC, 20375, United States, 202-404-8632
Gary Pennington
Affiliation:
[email protected], U.S. Army Research Laboratory, Adelphi, MD, 20783, United States
Michael J Mehl
Affiliation:
[email protected], U.S. Naval Research Laboratory, Code 6390, 4555 Overlook Ave. SW, Washington, DC, 20375, United States
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Abstract

To understand nanoribbons of graphene, we developed an ab initio parametrized fit to Carbon and Hydrogen chemical data, out to arbitrary neighbor interactions, including relaxations. Our computed band structure confirms the well-known three-family behavior of armchair bangaps but also predicts a similar familial behavior for conductance in nanoribbon transistors. The Boltzmann carrier transport simulations from calculated phonon spectra show, over a range of temperatures, the familial conductance behavior. Both the peak field-effect mobility and the "on" conductance increase with ribbon width, the later being proportional to the width and inversely proportional to the lattice temperature. We will also discuss phonon-limited scattering of charge carriers in graphene.

Keywords

nanostructureelectronic structureelectronic material
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1057: Symposium II – Nanotubes and Related Nanostructures , 2007 , 1057-II10-41
Copyright
Copyright © Materials Research Society 2008

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References

REFERENCES

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