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)