Supercurrent on a vortex core in 2H-NbSe${}_2$: current driven scanning tunneling spectroscopy

Abstract

We report current driven scanning tunneling spectroscopy (CDSTS) measurements at very low temperatures on vortices in 2H-NbSe2. We find that a current produces an increase of the density of states at the Fermi level in between vortices, and a reduction of the zero bias peak at the vortex center. This occurs well below the de-pairing current. We conclude that a supercurrent affects the low energy part of the superconducting gap structure of 2H-NbSe2.

5 pages, 5 figures

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• Probing unconventional superconductivity in inversion symmetric doped Weyl semimetal
• Tilted vortex cores and superconducting gap anisotropy in 2H-NbSe2
• Quasiparticle spectra of Abrikosov vortices in a uniform supercurrent flow
• Subsurface bending and reorientation of tilted vortex lattices in the bulk due to Coulomb-like repulsion at the surface
• Thermal creep emerging from cooling a tilted vortex lattice in uniaxial superconductor
• Low frequency imaginary impedance at the superconducting transition of 2H-NbSe${}_2$
• Magnification of signatures of topological phase transition by quantum zero point motion