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Measurement of the electronic compressibility of bilayer graphene

E. A. Henriksen and J. P. Eisenstein
Phys. Rev. B 82, 041412(R) – Published 27 July 2010

Abstract

We present measurements of the electronic compressibility, K, of bilayer graphene in both zero and finite magnetic fields up to 14 T, and as a function of both the carrier density and electric field perpendicular to the graphene sheet. The low-energy hyperbolic band structure of bilayer graphene is clearly revealed in the data, as well as a sizable asymmetry between the conduction and valence bands. A sharp increase in K1 near zero density is observed for increasing electric field strength, signaling the controlled opening of a gap between these bands. At high magnetic fields, broad Landau level (LL) oscillations are observed, directly revealing the doubled degeneracy of the lowest LL and allowing for a determination of the disorder broadening of the levels.

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  • Received 15 April 2010

DOI:https://doi.org/10.1103/PhysRevB.82.041412

©2010 American Physical Society

Authors & Affiliations

E. A. Henriksen* and J. P. Eisenstein

  • Condensed Matter Physics, California Institute of Technology, Pasadena, California 91125, USA

  • *erikku@caltech.edu

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Issue

Vol. 82, Iss. 4 — 15 July 2010

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