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Superlattice Dirac points

The relative orientation between graphene and hexagonal boron nitride casuses a moire pattern to occur. This moire pattern is due to a periodic potential which causes new superlattice Dirac points to form at the wavevector of the moire pattern.

Using scanning tunneling spectroscopy, we have identified the energy of these new superlattice Dirac points as a function of the wavelength of the moire pattern and also examined their movement with gate voltage. They appear as suppresions of the density of states which move parallel to the main Dirac point and can appear in either the conduction or valence band. This work was published in Nature Physics