Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-05-06
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 4 figures, Phys. Rev. Lett. 102, 256405
Scientific paper
It has been predicted that application of a strong electric field perpendicular to the plane of bilayer graphene can induce a significant band gap. We have measured the optical conductivity of bilayer graphene with an efficient electrolyte top gate for a photon energy range of 0.2 - 0.7 eV. We see the emergence of new transitions as a band gap opens. A band gap approaching 200 meV is observed when an electric field ~ 1 V/nm is applied by an electrolyte gate to the bilayer system, inducing a carrier density of about 10^13 cm-2. The magnitude of the band gap and the features observed in the infrared conductivity spectra are broadly compatible with calculations within a tight-binding model.
Heinz Tony F.
Lui Chun Hung
Mak Kin Fai
Shan Jie
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