Magnonic triply-degenerate nodal points

  title={Magnonic triply-degenerate nodal points},
  author={S A Owerre},
  journal={arXiv: Strongly Correlated Electrons},
  • S. Owerre
  • Published 31 October 2017
  • Physics
  • arXiv: Strongly Correlated Electrons
We generalize the concept of triply-degenerate nodal points to non-collinear antiferromagnets. Here, we introduce this concept to insulating quantum antiferromagnets on the decorated honeycomb lattice, with spin-$1$ bosonic quasiparticle excitations known as magnons. We demonstrate the existence of magnonic surface states with constant energy contours that form pairs of magnonic arcs connecting the surface projection of the magnonic triple nodal points. The quasiparticle excitations near the… 

Figures from this paper

Discovery of coexisting Dirac and triply degenerate magnons in a three-dimensional antiferromagnet
By measuring spin excitations of a three-dimensional antiferromagnet Cu3TeO6 with inelastic neutron scattering, this work provides direct spectroscopic evidence for the coexistence of symmetry-protected Dirac and triply degenerate nodes, the latter involving three-component magnons beyond the Dirac–Weyl framework.
Two-dimensional Dirac nodal loop magnons in collinear antiferromagnets.
  • S. Owerre
  • Physics, Medicine
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2018
The Dirac nodal loops (DNLs) are not present in the collinear ferromagnet on the two-dimensional CaVO lattice and they provide a novel platform to search for their analogs in 2D electronic antiferromagnetic systems.
Impurity-induced triple point fermions in twisted bilayer graphene
Triple point fermions are elusive electronic excitations that generalize Dirac and Weyl modes beyond the conventional high energy paradigm. Yet, finding real materials naturally hosting these
Topological Magnons with Nodal-Line and Triple-Point Degeneracies: Implications for Thermal Hall Effect in Pyrochlore Iridates.
Three distinct regimes of magnon band topology are found, as a function of the ratio of Dzyaloshinskii-Moriya interaction to the antiferromagnetic exchange, in AIAO systems.
Topological Weyl magnons and thermal Hall effect in layered honeycomb ferromagnets
In this work, we study the topological properties and magnon Hall effect of a three-dimensional ferromagnet in the ABC stacking honeycomb lattice, motivated by the recent inelastic neutron scattering
Nonreciprocal superposition state in antiferromagnetic optospintronics
The absence of net magnetization, which forbids any stray magnetic fields, is one of the greatest advantages of antiferromagnets in device applications. In conventional antiferromagnets, however,
Weyl triplons in SrCu2(BO3)2
We propose that Weyl triplons are expected to appear in the low energy magnetic excitations in the canonical Shastry-Sutherland compound, SrCu2(BO3)2, a quasi-2D quantum magnet. Our results show that
Realization of Opened and Closed Nodal Lines and Four- and Three-fold Degenerate Nodal Points in XPt (X = Sc, Y, La) Intermetallic Compound: A Computational Modeling Study
  • Heju Xu
  • Medicine
    Frontiers in Chemistry
  • 2020
This study reports that XPt (X = Sc, Y, La) intermetallic compounds are topological metals with opened and closed nodal lines, and triply degenerate nodal points (TNPs) when the spin–orbit coupling (SOC) is ignored.
Topological carbon materials: A new perspective
Carbon has numerous one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) allotropic structures. The study of carbon materials has been a major focus of material science and


however (for it was the literal soul of the life of the Redeemer, John xv. io), is the peculiar token of fellowship with the Redeemer. That love to God (what is meant here is not God’s love to men)
Science today studies phenomena lasting less than 10−21 s and phenomena which occurred more than 13 billion years ago; science also studies phenomena occurring over distances greater than 1028 cm and
  • Rev. Lett. 96, 247201
  • 2006
  • Rev. 120, 91
  • 1960
  • Solids 4, 241
  • 1958
  • Fang, H.- M. Weng, Y.-G. Shi, T. Qian, H. Ding, Nature 546, 627
  • 2017
  • Fang, arXiv:1703.08545
  • 2017
  • Zhang, arXiv:1709.04964
  • 2017
  • 1, 025007
  • 2017
  • Phys.
  • 2017