Capacitance of graphene bilayer as a probe of layer-specific properties
Author(s)Levitov, Leonid; Young, Andrea F.
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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, stemming from the interplay between interlayer screening, disorder, and the inverse-square-root van Hove singularity particular to the bilayer graphene band structure. We show how capacitance experiments can be used to probe the ground-state layer polarization, a potentially useful tool in the study of broken symmetry states in graphene.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review B
American Physical Society (APS)
Young, Andrea F., and Leonid S. Levitov. “Capacitance of graphene bilayer as a probe of layer-specific properties.” Physical Review B 84.8 (2011): n. pag. Web. 26 Jan. 2012. © 2011 American Physical Society
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