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American Physical Society, Physical review B, 15(92)

DOI: 10.1103/physrevb.92.155409

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Local spectroscopy of moiré-induced electronic structure in gate-tunable twisted bilayer graphene

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Twisted bilayer graphene (tBLG) forms a quasicrystal whose structural and electronic properties depend on the angle of rotation between its layers. Here we present a scanning tunneling microscopy study of gate-tunable tBLG devices supported by atomically-smooth and chemically inert hexagonal boron nitride (BN). The high quality of these tBLG devices allows identification of coexisting moiré patterns and moiré super-superlattices produced by graphene-graphene and graphene-BN interlayer interactions. Furthermore, we examine additional tBLG spectroscopic features in the local density of states beyond the first van Hove singularity. Our experimental data is explained by a theory of moiré bands that incorporates ab initio calculations and confirms the strongly non-perturbative character of tBLG interlayer coupling in the small twist-angle regime. ; Comment: 4 figures