Observation of Fermi Arcs in non-Centrosymmetric Weyl Semi-metal Candidate NbP

TL;DR

This study uses photoemission spectroscopy and calculations to identify Fermi arcs and topological surface states in NbP, providing evidence for Weyl Fermions and revealing potential spin textures.

Contribution

It presents the first direct observation of Fermi arcs and topological surface states in NbP, a non-centrosymmetric Weyl semimetal candidate.

Findings

Identification of Fermi arcs from topological surface states

Observation of circular dichroism pattern in surface states

Evidence supporting the existence of Weyl Fermions in NbP

Abstract

We report the surface electronic structure of niobium phosphide NbP single crystal on (001) surface by vacuum ultraviolet angle-resolved photoemission spectroscopy. Combining with our first principle calculations, we identify the existence of the Fermi arcs originated from topological surface states. Furthermore, the surface states exhibit circular dichroism pattern, which may correlate with its non-trivial spin texture. Our results provide critical evidence for the existence of the Weyl Fermions in NbP, which lays the foundation for further investigations.