Quantum capacitance and density of states of graphene

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.

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• Electric Field Effect in Atomically Thin Carbon Films
• The Raman Fingerprint of Graphene
• Carrier Statistics and Quantum Capacitance of Graphene Sheets and Ribbons
• Energy gaps in etched graphene nanoribbons
• Quantum dot behavior in graphene nanoconstrictions
• Transport gap in side-gated graphene constrictions

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