Momentum space signature of Berry curvature monopoles in a Weyl semimetal: from first principles to direct experimental observation

We investigate the Fermi arcs and the Weyl points in the prototypical non-centrosymmetric time-reversal invariant Weyl semimetal family TaAs/TaP in a joint analysis of state-of-the-art Ab-initio calculations and advanced photoemission spectroscopy methods. The Weyl physics is induced by the broken inversion symmetry giving rise to a predominant orbital magnetization, which results in the interplay with the spin-orbit interaction in the emergence of Weyl points. We characterize the local orbital magnetization in the vicinity of the Weyl points and explore indeed, in agreement with the local Berry curvature, clear features of Berry monopoles at the Weyl points.

[1]Min, C. H., Bentmann, H., Neu, J. N., Eck, P., Moser, S., Figgemeier, T., ... & Jozwiak, C. (2019). Orbital Fingerprint of Topological Fermi Arcs in the Weyl Semimetal TaP. Physical Review Letters, 122(11), 116402.