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Published July 27, 2010 | Published + Accepted Version
Journal Article Open

Measurement of the electronic compressibility of bilayer graphene

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 K^(−1) 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.

Additional Information

© 2010 The American Physical Society. Received 15 April 2010; revised manuscript received 2 July 2010; published 27 July 2010. This work is supported by the NSF under Grant No. DMR-0552270 and the DOE under Grant No. DE-FG03-99ER45766. We gratefully acknowledge conversations with J. Alicea, B. Chickering, M. Fogler, M. Koshino, A. H. MacDonald, E. McCann, D. Nandi, G. Refael, S. Das Sarma, and A. Young.

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Published - Henriksen2010p11031Phys_Rev_B.pdf

Accepted Version - 1004.2543.pdf

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