NDLI: Unusually strong temperature dependence of graphene electron mobility

Content Provider	IEEE Xplore Digital Library
Author	Akturk, A. Goldsman, N.
Copyright Year	2008
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Univ. of Maryland, College Park, MD (Akturk, A.; Goldsman, N.)
Abstract	We report unusually strong temperature dependence of graphene electron mobility, obtained using full-band Monte Carlo (MC) simulations and experiment. The electron-phonon scattering limited intrinsic graphene electron mobility changes by as much as the fourth power of temperature, $T^{n}$ (2 < n < 4), in the 200 K to 350 K range. This is in contradiction with the generally observed approximately linear T dependence around room temperature. This linear dependence arises due to the phonon equipartition approximation that gives rise to a linear temperature versus scattering rate relation. The highly nonlinear temperature dependence is reminiscent of transport in the Bloch-Gruneisen temperature range, where phonon energies assisting emissions and absorptions are less than or comparable to thermal energies. In addition, graphene has a conic dispersion relation around its K points or conduction band minima, setting it apart from other materials with parabolic energy-momentum curves around their conduction band minima, and consequently well-defined effective masses.
Starting Page	173
Ending Page	176
File Size	716645
Page Count	4
File Format	PDF
ISBN	9781424417537
DOI	10.1109/SISPAD.2008.4648265
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-09-09
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phonons Scattering Temperature dependence Dispersion Temperature measurement Monte Carlo methods Acoustics graphene mobility temperature dependence graphene mobility temperature dependence Bloch-Gruneisen temperature dependence
Content Type	Text
Resource Type	Article

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