Scale-invariant large nonlocality in polycrystalline graphene
arXiv:1706.02539 · doi:10.1038/s41467-017-02346-x
Abstract
The observation of large nonlocal resistances near the Dirac point in graphene has been related to a variety of intrinsic Hall effects, where the spin or valley degrees of freedom are controlled by symmetry breaking mechanisms. Engineering strong spin or valley Hall signals on scalable graphene devices could stimulate further practical developments of spin- and valleytronics. Here we report on scale-invariant nonlocal transport in large-scale chemical vapour deposition graphene under an applied external magnetic field. Contrary to previously reported Zeeman spin Hall effect, our results are explained by field-induced spin-filtered edge states whose sensitivity to grain boundaries manifests in the nonlocal resistance. This phenomenon, related to the emergence of the quantum Hall regime, persists up to the millimeter scale, showing that polycrystalline morphology can be imprinted in nonlocal transport. This suggests that topological Hall effects in large-scale graphene materials are highly sensitive to the underlying structural morphology, limiting practical realizations.
Main paper (14 pages, 5 figures) and Supplementary information (8 pages, 8 figures)
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- Long-range nontopological edge currents in charge-neutral graphene
- Gate tunability of highly efficient spin-to-charge conversion by spin Hall effect in graphene proximitized with WSe
- Gate-tunable spin Hall effect in an all-light-element heterostructure: graphene with copper oxide
- Emergent inhomogeneity and non-locality in a graphene field-effect transistor on a near-parallel moire superlattice of transition metal dichalcogenides
- Thermal transport driven by charge imbalance in graphene in magnetic field, close to the charge neutrality point at low temperature: Non local resistance
- Charge-induced artifacts in non-local spin transport measurements: How to prevent spurious voltage signals
- Proximity Effect of Epitaxial Iron Phthalocyanine Molecules on High-Quality Graphene Devices
- Generation and control of non-local chiral currents in graphene superlattices by orbital Hall effect