![]() ![]() Unexpectedly, although the edge conductance has little effect on the current flow in zero magnetic field, it leads to field-induced decoupling between edge and bulk transport at moderate fields. Using a superconducting quantum interference device on a tip (SQUID-on-tip) for nanoscale thermal and scanning gate imaging 25, here we demonstrate that the commonly occurring charge accumulation at graphene edges 23, 26, 27, 28, 29, 30, 31 leads to giant nonlocality, producing narrow conductive channels that support long-range currents. Graphene, in particular, exhibits giant nonlocality at charge neutrality 1, 15, 16, 17, 18, 19, a striking behaviour that has attracted competing explanations. However, the origin of these effects is hotly debated 3, 11, 17, 22, 23, 24. Monolayer 1, 2, 3, 4, 5, 10, 15, 16, 17, 18, 19, bilayer 9, 11, 14, 20 and few-layer 21 graphene, transition-metal dichalcogenides 6, 7 and moiré superlattices 8, 10, 12 have been found to display pronounced nonlocal effects. ![]() Nonlocal measurements, wherein a voltage is measured at contacts placed far away from the expected classical flow of charge carriers, have been widely used in the search for novel transport mechanisms, including dissipationless spin and valley transport 1, 2, 3, 4, 5, 6, 7, 8, 9, topological charge-neutral currents 10, 11, 12, hydrodynamic flows 13 and helical edge modes 14, 15, 16. Van der Waals heterostructures display numerous unique electronic properties. ![]()
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