Capacitance of Graphene Bilayer as a Which-Layer Probe

Details Capacitance of Graphene Bilayer as a Which-Layer Probe Capacitance of Graphene Bilayer as a Which-Layer Probe

2011-05-09

arxiv.org/abs/1105.1801v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Minor changes, references added

Scientific paper

10.1103/PhysRevB.84.085441

The unique capabilities of capacitance measurements in bilayer graphene enable probing of layer-specific properties that are normally out of reach in transport measurements. Furthermore, capacitance measurements in the top-gate and penetration field geometries are sensitive to different physical quantities: the penetration field capacitance probes the two layers equally, whereas the top gate capacitance preferentially samples the near layer, resulting in the "near-layer capacitance enhancement" effect observed in recent top-gate capacitance measurements. We present a detailed theoretical description of this effect and show that capacitance can be used to determine the equilibrium layer polarization, a potentially useful tool in the study of broken symmetry states in graphene.

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