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5 p, 656.4 KB Have mysterious topological valley currents been observed in graphene superlattices? / Roche, Stephan (Institut Català de Nanociència i Nanotecnologia) ; Power, Stephen R. (Trinity College Dublin. School of Physics) ; Nikolić, Branislav K. (University of Delaware. Department of Physics and Astronomy) ; Garcia, José H. (Institut Català de Nanociència i Nanotecnologia) ; Jauho, Antti-Pekka (Technical University of Denmark. Center for Nanostructured Graphene)
We provide a critical discussion concerning the claim of topological valley currents, driven by a global Berry curvature and valley Hall effect proposed in recent literature. After pointing out a major inconsistency of the theoretical scenario proposed to interpret giant nonlocal resistance, we discuss various possible alternative explanations and open directions of research to solve the mystery of nonlocal transport in graphene superlattices.
2022 - 10.1088/2515-7639/ac452a
JPhys materials, Vol. 5, issue 2 (April 2022) , art. 21001  

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