Twisted Bogoliubov quasiparticles in the superconducting NbSe${}_2$ 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 NbSe${}_2$/graphene using spectroscopic-imaging scanning tunneling microscopy. The NbSe${}_2$ 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 NbSe${}_2$ and graphene lattices. We find that the twisted interference patterns originate from a sextet of regions in momentum space where the Fermi surfaces of NbSe${}_2$ and graphene overlap. The Fermi surface overlap is sensitive to the twist angle, providing a knob to tune superconductivity.

arXiv comment20 pages + 8 pages supplementary, 5 figures in main text + 6 supplementary figures

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• Resonant interlayer coupling in NbSe${}_2$-graphite epitaxial moir{é} superlattices
• Superconducting Berry Curvature Dipole
• Encapsulation epitaxy of air-stable monolayer superconducting films for quantum circuits and qubits