2018/02/28 by Peter Rickhaus, John Wallbank, John R. Wallbank +15 · 2 citations
Materials Science · Physics and Astronomy · #Bent molecular geometry #Bilayer graphene #Condensed matter physics #Graphene #Graphene research and applications #Lattice (music) #Lorentz force #Magnetic field #Materials science #Physics #Quantum Hall effect #Quantum and electron transport phenomena #Quantum mechanics #Topological Materials and Phenomena #Topological insulator #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1021/acs.nanolett.8b02387
published as Nano Lett. 2018, 18, 11, 6725-6730
openalex publication_date 2018/10/16 · arxiv created 2018/10/24 · arxiv updated 2019/09/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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.