Kavli Affiliate: Feng Wang
| First 5 Authors: Qicheng Zhang, Sheng Wang, Zhaoli Gao, Sebastian Hurtado-Parra, Joel Berry
| Summary:
Quantum valley Hall (QVH) domain wall states are a new class of
one-dimensional (1D) one-way conductors that are topologically protected in the
absence of valley mixing. Development beyond a single QVH channel raises
important new questions as to how QVH channels in close spatial proximity
interact with each other, and how that interaction may be controlled. Scalable
epitaxial bilayer graphene synthesis produces layer stacking wall (LSW)
bundles, where QVH channels are bound, providing an excellent platform to study
QVH channel interactions. Here we show that distinct strain sources lead to the
formation of both well-separated LSWs and close packed LSW bundles. Comparative
studies of electronic transport in these two regimes reveal that close-packed
LSW bundles support electrically tunable magnetoconductance. The coexistence of
different strain sources offers a potential pathway to realize scalable quantum
transport platform based on LSWs where electrically tunability enables
programmable functionality.
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