Measurement of the electronic compressibility of bilayer graphene

Details Measurement of the electronic compressibility of bilayer graphene Measurement of the electronic compressibility of bilayer graphene

2010-04-15

arxiv.org/abs/1004.2543v3

PRB 82, 041412(R), 2010

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures; final version for publication

Scientific paper

10.1103/PhysRevB.82.041412

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.

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