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Influence of anisotropy, tilt and pairing of Weyl nodes: the Weyl semimetals TaAs, TaP, NbAs and NbP

Author

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  • Davide Grassano

    (Dept. of Physics, University of Rome Tor Vergata
    Istituto Nazionale di Fisica Nucleare (INFN))

  • Olivia Pulci

    (Dept. of Physics, University of Rome Tor Vergata
    Istituto Nazionale di Fisica Nucleare (INFN))

  • Elena Cannuccia

    (Dept. of Physics, University of Rome Tor Vergata
    Université Aix-Marseille, Laboratoire de Physique des Interactions Ioniques et Moléculaires (PIIM), UMR CNRS 7345)

  • Friedhelm Bechstedt

    (Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena)

Abstract

By means of ab initio band structure methods and model Hamiltonians we investigate the electronic, spin and topological properties of four monopnictides crystallizing in bct structure. We show that the Weyl bands around a WP W1 or W2 possess a strong anisotropy and tilt of the accompanying Dirac cones. These effects are larger for W2 nodes than for W1 ones. The node tilts and positions in energy space significantly influence the DOS of single-particle Weyl excitations. The node anisotropies destroy the conventional picture of (anti)parallel spin and wave vector of a Weyl fermion. This also holds for the Berry curvature around a node, while the monopole charges are independent as integrated quantities. The pairing of the nodes strongly modifies the spin texture and the Berry curvature for wave vectors in between the two nodes. Spin components may change their orientation. Integrals over planes perpendicular to the connection line yield finite Zak phases and winding numbers for planes between the two nodes, thereby indicating the topological character. Graphical abstract

Suggested Citation

  • Davide Grassano & Olivia Pulci & Elena Cannuccia & Friedhelm Bechstedt, 2020. "Influence of anisotropy, tilt and pairing of Weyl nodes: the Weyl semimetals TaAs, TaP, NbAs and NbP," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 93(8), pages 1-12, August.
    • Handle: RePEc:spr:eurphb:v:93:y:2020:i:8:d:10.1140_epjb_e2020-10110-x
    DOI: 10.1140/epjb/e2020-10110-x
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    Solid State and Materials;

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