Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-05-24
Nature Physics 7, 944-947 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 5 figures, including the supplementary information on the electron-hole asymmetry of ABA-stacked trilayer
Scientific paper
10.1038/NPHYS2102
A striking feature of bilayer graphene is the induction of a significant band gap in the electronic states by the application of a perpendicular electric field. Thicker graphene layers are also highly attractive materials. The ability to produce a band gap in these systems is of great fundamental and practical interest. Both experimental and theoretical investigations of graphene trilayers with the typical ABA layer stacking have, however, revealed the lack of any appreciable induced gap. Here we contrast this behavior with that exhibited by graphene trilayers with ABC crystallographic stacking. The symmetry of this structure is similar to that of AB stacked graphene bilayers and, as shown by infrared conductivity measurements, permits a large band gap to be formed by an applied electric field. Our results demonstrate the critical and hitherto neglected role of the crystallographic stacking sequence on the induction of a band gap in few-layer graphene.
Cappelluti Emmanuele
Heinz Tony F.
Li Zhiqiang
Lui Chun Hung
Mak Kin Fai
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