SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 53: Graphene
TT 53.4: Vortrag
Donnerstag, 30. März 2023, 15:45–16:00, HSZ 204
Coulomb blockade effects in minimally twisted bilayer graphene — •Patrick Wittig1, Fernando Dominguez1, Christophe De Beule2,3, and Patrik Recher1,4 — 1Institute for Mathematical Physics, TU Braunschweig, 38106 Braunschweig, Germany — 2Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg — 3Department of Physics and Astronomy, University of Pennsylvania, Philadelphia PA19104 — 4Laboratory of Emerging Nanometrology, 38106 Braunschweig, Germany
In the presence of a finite interlayer electric field, minimally twisted bilayer graphene displays a triangular network of chiral valley Hall states that propagate along the AB/BA interfaces and scatter at the metallic AA regions. Previous studies model the chiral network using a phenomenological scattering matrix approach based entirely on the symmetries of the system [1,3]. So far, the physics of the metallic AA scattering regions has been disregarded, although in the chiral network regime are also flat bands corresponding to a finite density of states in the AA region [2]. Therefore, we include in the phenomenological scattering matrix the AA regions in form of quantum dots: A set of discrete energy levels with Coulomb interaction, which we treat in mean field theory. We study the resulting network through the energy spectrum and magneto-conductance calculations.
[1] D. Efimkin, A. MacDonald, PRB 98, 035404 (2018)
[2] A. Ramires, J. Lado, PRL 121, 146801 (2018)
[3] C. De Beule, F. Dominguez, P. Recher, PRL 125, 096402, (2020)