Affiliation
Technische Universität Braunschweig
Talk Title
Transport through valley chiral networks in minimally twisted bilayer graphene
Abstract
Twisted bilayer graphene (TBG) consists of two graphene sheets on top of each other where one sheet is rotated with respect to the other leading to smooth moiré-like potentials where new physics emerges not shared by a single layer alone. I will discuss minimally TBG (rotation angle well below the magic angle) where an interlayer voltage leads to a network of valley chiral states. We developed a phenomenological scattering theory that only takes into account the basic symmetries of the network [1,2]. I will discuss how different electronic phases like a zigzag metallic regime or flatband pseudo-Landau levels emerge within our theory and will also discuss their transport properties in a four-terminal setup including magnetic and electric fields.
[1] C. De Beule, F. Dominguez, P. Recher, Phys. Rev. Lett. 125, 096402 (2020).
[2] C. De Beule, F. Dominguez, P. Recher, Phys. Rev. B 104, 195410 (2021).