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Tunable Fermi surface topology and Lifshitz transition in bilayer graphene | | Anastasia Varlet
; Marcin Mucha-Kruczyński
; Dominik Bischoff
; Pauline Simonet
; Takashi Taniguchi
; Kenji Watanabe
; Vladimir Fal'ko
; Thomas Ihn
; Klaus Ensslin
; | | Date: |
12 Aug 2015 | | Abstract: | 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. | | Source: | arXiv, 1508.2922 | | Services: | Forum | Review | PDF | Favorites | |
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