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Graphene superlattices have recently been attracting growing interest as anemergent class of quantum metamaterials. In this paper, we report theobservation of nonlocal transport in bilayer graphene (BLG) superlatticesencapsulated between two hexagonal boron nitride (hBN) layers, which formedhBN/BLG/hBN moir\'e superlattices. We then employed these superlattices todetect a long-range charge-neutral valley current using an all-electricalmethod. The moir\'e superlattice with broken inversion symmetry leads to a hotspot with Berry curvature accumulating at the charge neutral point (CNP), andit harbors satellites of the CNP. We observed nonlocal resistance on the orderof 1 $\text{k}\Omega$, which obeys a scaling relation. This nonlocal resistanceevolves from the quantum Hall effect but without magnetic field/time-reversalsymmetry breaking, which is associated with a hot-spot-induced topologicalvalley current. This study should pave the way to developing aBerry-phase-sensitive probe to detect hot spots in gapped Dirac materials withinversion-symmetry breaking.

Topological Valley Currents in Bilayer Graphene/Hexagonal Boron Nitride Superlattices