Detecting topological currents in graphene superlattices
University of Manchester · Harvard University · +1 more institution
Abstract
Topological materials may exhibit Hall-like currents flowing transversely to the applied electric field even in the absence of a magnetic field. In graphene superlattices, which have broken inversion symmetry, topological currents originating from graphene's two valleys are predicted to flow in opposite directions and combine to produce long-range charge neutral flow. We observed this effect as a nonlocal voltage at zero magnetic field in a narrow energy range near Dirac points at distances as large as several micrometers away from the nominal current path. Locally, topological currents are comparable in strength with the applied current, indicating large valley-Hall angles. The long-range character of…
Citation impact
- FWCI
- 31.59
- Percentile
- 100%
- References
- 39
Authors
11Topics & keywords
- Graphene
- Superlattice
- Point reflection
- Topology (electrical circuits)
- Magnetic field
- Physics
- Condensed matter physics
- Current (fluid)
- Sustainable cities and communities