Weyl-triplons in SrCu2(BO3)2

Abstract

We propose that Weyl triplons are expected to appear in the low energy magnetic excitations in the canonical Shastry-Sutherland compound, \ce{SrCu2(BO3)2}, a quasi-2D quantum magnet. Our results show that when a minimal, realistic inter-layer coupling is added to the well-established microscopic model describing the excitation spectrum of the individual layers, the Dirac points that appear in the zero-field triplon spectrum of the 2D model split into two pairs of Weyl points along the $k_z$ direction. Varying the strength of the inter-layer DM-interaction and applying a small longitudinal magnetic field results in a range of band-topological transitions accompanied by changing numbers of Weyl points. We propose inelastic neutron scattering along with thermal Hall effect as the experimental techniques to detect the presence of Weyl node in the triplon spectrum of this material. We show that the logarithmic divergence in the second derivative in thermal Hall conductance near phase transition from regime Weyl points to a regime with topologically gapped bands as well as a finite slope in the thermal Hall conductance as a function of magnetic field at zero magnetic field are promising evidence for the presence of Weyl triplons.

arXiv comment13 pages, 6 figures

References in corpus (75)

• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• Type-II Weyl Semimetals
• Experimental discovery of Weyl semimetal TaAs
• Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
• Chern semi-metal and Quantized Anomalous Hall Effect in HgCr2Se4
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• Beyond Dirac and Weyl fermions: Unconventional quasiparticles in conventional crystals
• Experimental observation of Weyl points
• Magnetic Weyl Semimetal Phase in a Kagome Crystal
• Weyl points and line nodes in gapless gyroid photonic crystals
• Spin Anisotropy and Quantum Hall Effect in the Kagome Lattice - Chiral Spin State based on a Ferromagnet-
• Theory of Thermal Hall Effect in Quantum Magnets
• Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet
• Theoretical prediction of rotating magnon wavepacket in ferromagnets
• Synthetic gauge fields and Weyl point in Time-Reversal Invariant Acoustic Systems
• Weyl semimetal with broken time reversal and inversion symmetries
• Spin-ladders with spin gaps: A description of a class of cuprates
• Topological Magnon Insulator in Insulating Ferromagnet
• Time-Reversal-Breaking Weyl Fermions in Magnetic Heusler Alloys
• Double-Weyl phonons in transition-metal monosilicides
• Topological Nature of the Phonon Hall Effect
• Magnetic Superstructure in the Two-Dimensional Quantum Antiferromagnet SrCu2(BO3)2
• Rotational motion of magnon and thermal Hall effect
• Quantum Phase Transitions in the Shastry-Sutherland Model for $\mathbf{SrC}{\mathbf{u}}_2(\mathbf{B}{\mathbf{O}}_3{)}_2$
• A first theoretical realization of honeycomb topological magnon insulator
• A Realization of the Haldane-Kane-Mele Model in a System of Localized Spins
• Observation of Double Weyl Phonons in Parity-Breaking FeSi
• Weyl magnons in breathing pyrochlore antiferromagnets
• Theoretical prediction of magnetic and noncentrosymmetric Weyl fermion semimetal states in the R-Al-X family of compounds (R=rare earth, Al=aluminium, X=Si, Ge)
• Tunable magnon Weyl points in ferromagnetic pyrochlores
• Hall effect of triplons in a dimerized quantum magnet
• Dispersion and Symmetry of Bound States in the Shastry-Sutherland Model
• Direct observation of the multiple spin gap excitations in two-dimensional dimer system SrCu2(BO3)2
• Topological Triplon Modes and Bound States in a Shastry-Sutherland Magnet
• Topological triply-degenerate point with double Fermi arcs
• Dzyaloshinski-Moriya Interaction in the 2D Spin Gap System SrCu2(BO3)2
• Topological excitations in the ferromagnetic Kitaev-Heisenberg model
• Magnonic Weyl semimetal in pyrochlore ferromagnets
• Phase Diagram of the quadrumerized Shastry-Sutherland Model
• Topological Magnon-Phonon Hybrid Excitations in Two-Dimensional Ferromagnets with Tunable Chern Numbers
• Fractalization drives crystalline states in a frustrated spin system
• Thermal Hall effect and topological edge states in a square lattice antiferromagnet
• SU(3) Topology of Magnon-Phonon Hybridization in 2D Antiferromagnets
• Multi Weyl Points and the Sign Change of Their Topological Charges in Woodpile Photonic Crystals
• Magnetization plateaus of SrCu_2(BO_3)_2 from a Chern-Simons theory
• High Resolution Study of Spin Excitations in the Shastry-Sutherland Singlet Ground State of SrCu2(BO3)2
• Observation of quadratic Weyl points and double-helicoid arcs
• Chiral anomaly of Weyl magnons in stacked honeycomb ferromagnets
• ESR study on the excited state energy spectrum of SrCu${}_2$(BO${}_3$)${}_2$ -a central role of multiple-triplet bound states
• Topological Magnetoelastic Excitations in Non-Collinear Antiferromagnets
• Observation of a charge-2 photonic Weyl point in the infrared
• Berry phase and Anomalous Hall Effect in a Three-orbital Tight-binding Hamiltonian
• Topological magnon amplification
• Anti-chiral edge states in Heisenberg ferromagnet on a honeycomb lattice
• Topological magnon bands in the zigzag and stripy phases of antiferromagnetic honeycomb lattice
• Magnon topology and thermal Hall effect in trimerized triangular lattice antiferromagnet
• Topological magnons in a kagome lattice spin system with $XXZ$ and Dzyaloshinskii-Moriya interactions
• The effect of Dzyaloshinskii-Moriya interactions on the phase diagram and magnetic excitations of SrCu2(BO3)2
• Weyl magnons in noncoplanar stacked kagome antiferromagnets
• Magnetic chern bands and triplon Hall effect in an extended Shastry-Sutherland model
• Structural Phase Transition in the 2D Spin Dimer Compound SrCu2(BO3)2
• Topological magnon bands for magnonics
• Ground-State Phase Diagram for the Three-Dimensional Orthogonal-Dimer System
• Magnetic field control of topological magnon-polaron bands in two-dimensional ferromagnets
• ${\mathbb{Z}}_2$ topological quantum paramagnet on a honeycomb bilayer
• Floquet Weyl Magnons
• Magnon quantum anomalies in Weyl ferromagnets
• A class of Heisenberg models with the orthogonal dimer ground states
• Three-Band Model for Quantum Hall and Spin Hall Effects
• Magnonic triply-degenerate nodal points
• The topological magnon bands in the Flux state in Sashtry-Sutherland lattice
• Topological transitions of spin-excitations in insulating chiral antiferromagnets

Cited by in corpus (10)

• Topological Magnons: A Review
• Topological Hybrids of Magnons and Magnon Bound Pairs
• Electric field induced thermal Hall effect of triplons in the quantum dimer magnets $X$CuCl${}_3$ ($X=$ Tl, K)
• Magnon Hall effect in antiferromagnetic lattices
• Tuning bulk topological magnon properties with light-induced magnons
• Formulation of spin Nernst effect for spin-nonconserving insulating magnets
• Spin Nernst and thermal Hall effects of topological triplons in quantum dimer magnets on the maple-leaf and star lattices
• Scattering Theory of Chiral Edge Modes in Topological Magnon Insulators
• Stabilization of Granovskii-Zhedanov scars of the XYZ quantum spin chain via non-Hermitian spin relaxation
• Intrinsic suppression of topological thermal Hall effect in an exactly solvable quantum magnet