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We have performed device-based tunnelling spectroscopy of NbSe$_2$ in thevortex state with a magnetic field applied both parallel and perpendicular tothe $a-b$ plane. Our devices consist of layered semiconductors placed on top ofexfoliated NbSe$_2$ using the van der Waals transfer technique. At zero field,the spectrum exhibits a hard gap, and the quasiparticle peak is split into lowand high energy features. The two features, associated with the effectivetwo-band nature of superconductivity in NbSe$_2$, exhibit markedly distinctresponses to the application of magnetic field, suggesting anorder-of-magnitude difference in the spatial extent of the vortex cores of thetwo bands. At energies below the superconducting gap, the hard gap gives way tovortex-bound Caroli-de Gennes-Matricon states, allowing the detection ofindividual vortices as they enter and exit the junction. Analysis of thesub-gap spectra upon application of parallel magnetic field allows us to trackthe process of vortex surface formation and spatial rearrangement in the bulk.

Tunneling into the vortex state of NbSe$_2$ with van der Waals junctions