Tunable Fermi surface topology and Lifshitz transition in bilayer graphene

Varlet, Anastasia and Mucha-Kruczynski, Marcin and Bischoff, Dominik and Simonet, Pauline and Taniguchi, T. and Watanabe, K. and Falko, Vladimir and Ihn, Thomas and Ensslin, Klaus (2015) Tunable Fermi surface topology and Lifshitz transition in bilayer graphene. Synthetic Metals, 210 (A). pp. 19-31. ISSN 0379-6779

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Bilayer graphene is a highly tunable material: not only can one tune the Fermi energy using standard gates, as in single-layer graphene, but the band structure can also be modified by external perturbations such as transverse electric fields or strain. We review the theoretical basics of the band structure of bilayer graphene and study the evolution of the band structure under the influence of these two external parameters. We highlight their key role concerning the ease to experimentally probe the presence of a Lifshitz transition, which consists in a change of Fermi contour topology as a function of energy close to the edges of the conduction and valence bands. Using a device geometry that allows the application of exceptionally high displacement fields, we then illustrate in detail the way to probe the topology changes experimentally using quantum Hall effect measurements in a gapped bilayer graphene system.

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Journal Article
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Synthetic Metals
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19 Aug 2016 15:50
Last Modified:
22 Nov 2022 03:40