TITLE

Quantum capacitance and density of states of graphene

AUTHOR(S)
Dröscher, S.; Roulleau, P.; Molitor, F.; Studerus, P.; Stampfer, C.; Ensslin, K.; Ihn, T.
PUB. DATE
April 2010
SOURCE
Applied Physics Letters;4/12/2010, Vol. 96 Issue 15, p152104
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on measurements of the quantum capacitance in graphene as a function of charge carrier density. A resonant LC-circuit giving high sensitivity to small capacitance changes is employed. The density of states, which is directly proportional to the quantum capacitance, is found to be significantly larger than zero at and around the charge neutrality point. This finding is interpreted to be a result of potential fluctuations with amplitudes of the order of 100 meV in good agreement with scanning single-electron transistor measurements on bulk graphene and transport studies on nanoribbons.
ACCESSION #
49193337

 

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