TY - JOUR
T1 - Electronic phase coherence and relaxation in graphene field effect transistor
AU - Oh, Youngman
AU - Eom, Jonghwa
AU - Koo, Hyun Cheol
AU - Han, Suk Hee
N1 - Funding Information:
This work was supported by National Research Foundation of Korea Grant funded by the Korean Government ( 2010-0016005 ).
PY - 2010/11
Y1 - 2010/11
N2 - Using the low-field magnetoresistance measurement we have studied the electronic phase coherence of the graphene field effect transistor for different carrier types and densities. The characteristic time scales such as phase coherence time (τφ), intervalley scattering time (τi), and momentum relaxation time have been deduced by weak localization fit to the magnetoresistance. We found that the magnitude of τφ shows similar magnitudes for both types of charge carriers. In the lower density regime including the Dirac point, τφ increases rapidly as the density of carrier increases. However, τi shows a weak dependence of carrier type and density. The momentum relaxation time becomes saturated below 3 K regardless of carrier type and density, which is in contrast to the temperature dependence of τφ.
AB - Using the low-field magnetoresistance measurement we have studied the electronic phase coherence of the graphene field effect transistor for different carrier types and densities. The characteristic time scales such as phase coherence time (τφ), intervalley scattering time (τi), and momentum relaxation time have been deduced by weak localization fit to the magnetoresistance. We found that the magnitude of τφ shows similar magnitudes for both types of charge carriers. In the lower density regime including the Dirac point, τφ increases rapidly as the density of carrier increases. However, τi shows a weak dependence of carrier type and density. The momentum relaxation time becomes saturated below 3 K regardless of carrier type and density, which is in contrast to the temperature dependence of τφ.
KW - A. Graphene
KW - D. Phase coherence
KW - D. Weak localization
KW - E. Magnetoresistance
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U2 - 10.1016/j.ssc.2010.08.020
DO - 10.1016/j.ssc.2010.08.020
M3 - Article
AN - SCOPUS:77957265707
VL - 150
SP - 1987
EP - 1990
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 41-42
ER -