Hidden type-II Weyl points in the Weyl semimetal NbP

Abstract

As one of Weyl semimetals discovered recently, NbP exhibits two groups of Weyl points with one group lying inside the $k_z=0$ plane and the other group staying away from this plane. All Weyl points have been assumed to be type-I, for which the Fermi surface shrinks into a point as the Fermi energy crosses the Weyl point. In this work, we have revealed that the second group of Weyl points are actually type-II, which are found to be touching points between the electron and hole pockets in the Fermi surface. Corresponding Weyl cones are strongly tilted along a line approximately $17^{\circ }$ off the $k_z$ axis in the $k_x-k_z$ (or $k_y-k_z$) plane, violating the Lorentz symmetry but still giving rise to Fermi arcs on the surface. Therefore, NbP exhibits both type-I ($k_z=0$ plane) and type-II ($k_z\ne 0$ plane) Weyl points.

arXiv comment5 pages and 4 figures

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• Magneto-optical evidence of tilting effect in coupled Weyl bands
• Model for charge carrier spectra in topological semimetals of the TaAs family
• Influence of anisotropy, tilt and pairing of Weyl nodes: The Weyl semimetals TaAs, TaP, NbAs and NbP