Transport through a network of topological channels in twisted bilayer graphene

Rickhaus, Peter; Wallbank, John; Slizovskiy, Sergey; Pisoni, Riccardo; Overweg, Hiske; Lee, Yongjin; Eich, Marius; Liu, Ming-Hao; Watanabe, Kenji; Taniguchi, Takashi; Ihn, Thomas; Ensslin, Klaus. 2018 Transport through a network of topological channels in twisted bilayer graphene. Nano Letters, 18 (11). 6725-6730.

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We explore a network of electronic quantum valley Hall states in the moiré crystal of minimally twisted bilayer graphene. In our transport measurements, we observe Fabry-Pérot and Aharanov-Bohm oscillations that are robust in magnetic fields ranging from 0 to 8 T, which is in strong contrast to more conventional two-dimensional systems where trajectories in the bulk are bent by the Lorentz force. This persistence in magnetic field and the linear spacing in density indicate that charge carriers in the bulk flow in topologically protected, one-dimensional channels. With this work, we demonstrate coherent electronic transport in a lattice of topologically protected states.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Hydro-climate Risks (Science Area 2017-)
ISSN: 1530-6984
Additional Keywords: twisted bilayer graphene, topological network, Fabry-Pérot, Valleytronics, moiré superlattice, quantum valley Hall effect
NORA Subject Terms: Physics
Date made live: 21 Nov 2018 14:00 +0 (UTC)

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