Twisted Bogoliubov quasiparticles in the superconducting NbSe2 monolayer on graphene
Abstract
The superconducting properties of layered materials can be controlled by thinning, stacking, and twisting, demanding investigation of electronic states by spectroscopic means at the nanometer scale. Here, we reveal the spatial variations of the electronic states in heterostructures of the superconducting monolayer NbSe2/graphene using spectroscopic-imaging scanning tunneling microscopy. The NbSe2 monolayer grown by molecular beam epitaxy is naturally twisted with respect to the graphene substrate and exhibits interference patterns of Bogoliubov quasiparticles twisted with respect to the NbSe2 and graphene lattices. We find that the twisted interference patterns originate from a sextet of regions in momentum space where the Fermi surfaces of NbSe2 and graphene overlap. The Fermi surface overlap is sensitive to the twist angle, providing a knob to tune superconductivity.
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