Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 29: Transport: Poster Session
TT 29.9: Poster
Thursday, September 8, 2022, 15:00–18:00, P1
Coulomb blockade effects in minimally twisted bilayer graphene — •Patrick Wittig1, Fernando Dominguez1, Cristophe De Beule2, and Patrik Recher1,3 — 1Institute for Mathematical Physics, TU Braunschweig, 38106 Braunschweig, Germany — 2Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg — 3Laboratory 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. So far, the physics of the metallic AA scattering regions has been disregarded, and indeed, the finite size of the AA regions (order of nm) can give rise to similar physics as quantum dots: a discrete energy spectrum and also interacting effects such as Coulomb blockade physics. In our contribution, we include these effects and study the resulting network of chiral modes and quantum dots through the energy spectrum and magneto-conductance calculations.