Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 101: Graphene IV: Electronic Properties and Structure

HL 101.9: Talk

Friday, March 11, 2016, 12:30–12:45, S051

Fermi surface nesting in the graphene twist bilayer — Maximilian Fleischmann, Dominik Weckbecker, Nicolas Ray, Oleg Pankratov, and •Sam Shallcross — Theoretische Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7B2, 91058 Erlangen

Two mutually rotated layers of graphene exhibit an electronic structure that depends profoundly on the rotation angle of the two layers [1]. This rich electronic structure invites the possibility of significant band engineering control in the small angle limit [2]. We demonstrate that the small angle limit exhibits a massive Fermi surface nesting in the presence of a perpendicular electric field of strength greater than ∼ 100 mV/Å. We describe in detail the unusual band topology in this nested region of the energy field phase space, and discuss some of the many body effects likely to be induced by such strong Fermi surface nesting.

[1] S. Shallcross et al., Phys. Rev. B 87, 245403, 2013.

[2] D. Weckbecker et al., submitted