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Overlaying two graphene layers with a small twist angle can create a moiresuperlattice to realize exotic phenomena that are entirely absent in graphenemonolayer. A representative example is the predicted formation of localizedpseudo-Landau levels (PLLs) with Kagome lattice in tiny-angle twisted bilayergraphene (TBG) with theta < 0.3 deg when the graphene layers are subjected todifferent electrostatic potentials. However, this was shown only for the modelof rigidly rotated TBG which is not realized in reality due to an interfacialstructural reconstruction. It is believed that the interfacial structuralreconstruction strongly inhibits the formation of the PLLs. Here, wesystematically study electronic properties of the TBG with 0.075 deg < theta <1.2 deg and demonstrate, unexpectedly, that the PLLs are quite robust for allthe studied TBG. The structural reconstruction suppresses the formation of theemergent Kagome lattice in the tiny-angle TBG. However, for the TBG aroundmagic angle, the sample-wide electronic Kagome lattices with tunable latticeconstants are directly imaged by using scanning tunneling microscope. Ourobservations open a new direction to explore exotic correlated phases in moiresystems.

Tunable Sample-wide Electronic Kagome Lattice in Low-angle Twisted Bilayer Graphene