Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Graphene: Electronic Properties, Structure and Substrate Interaction I (joint session O/TT)

TT 13.8: Vortrag

Montag, 12. März 2018, 12:15–12:30, MA 043

Optical deformations in graphene — •Reena Gupta and Sam Shallcross — Theoretische Festkörperphysik, FAU Erlangen-Nürnberg, Staudtstrasse 7/B2, 91058 Erlangen, Germany

Deformations in graphene slow on the scale of the lattice constant are, at lowest order, very well described by the addition of a pseudo-magnetic gauge field to the Dirac-Weyl equation [1]. Here we explore what happens when we consider slow deformations but of both possible modes that the two-atom unit cell allows, i.e., optical as well as acoustic modes. While the acoustic mode simply reproduces the well-known pseudo-magnetic gauge field, the optical mode generates both a chiral field as well as an imaginary magnetic gauge, with Hermiticity of the Hamiltonian maintained by a position dependent velocity correction. We comment on the relevance of these results to hybrid metal/graphene systems which feature strong deformation.

[1] B. Amorim et al., Physics Reports 617, 1 (2016).