Open AccessHave mysterious topological valley currents been observed in graphene superlattices?
Author(s) -
Stephan Roche,
Stephen R. Power,
Branislav K. Nikolić,
José H. Garcia,
Antti-Pekka Jauho
Publication year - 2022
Publication title -
jphys materials
Language(s) - English
Resource type - Journals
ISSN - 2515-7639
DOI - 10.1088/2515-7639/ac452a
Subject(s) - superlattice , graphene , berry connection and curvature , curvature , physics , theoretical physics , topology (electrical circuits) , condensed matter physics , quantum mechanics , mathematics , geometry , geometric phase , combinatorics
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.