Type-II Dirac points and Dirac nodal loops on the magnons of square-hexagon-octagon lattice
arXiv:2305.16419 · doi:10.1103/PhysRevB.108.144407
Abstract
We study topological magnons on an anisotropic square-hexagon-octagon (SHO) lattice which has been found by a two-dimensional Biphenylene network (BPN). We propose the concepts of type-II Dirac magnonic states where new schemes to achieve topological magnons are unfolded without requiring the Dzyaloshinsky-Moriya interactions (DMIs). In the ferromagnetic states, the topological distinctions at the type-II Dirac points along with one-dimensional (1D) closed lines of Dirac magnon nodes are characterized by the invariant. We find pair annihilation of the Dirac magnons and use the Wilson loop method to depict the topological protection of the band-degeneracy. The Green's function approach is used to calculte chiral edge modes and magnon density of states (DOS). We introduce the DMIs to gap the type-II Dirac magnon points and demonstrate the Dirac nodal loops (DNLs) are robust against the DMIs within a certain parameter range. The topological phase diagram of magnon bands is given via calculating the Berry curvature and Chern number. We find that the anomalous thermal Hall conductivity gives connection to the magnon edge current. Furthermore, we derive the differential gyromagnetic ratio to exhibit the Einstein-de Haas effect (EdH) of magnons with topological features.
arXiv commentarXiv admin note: text overlap with arXiv:2207.02886
References in corpus (34)
- Topological Insulators
- Weyl and Dirac Semimetals in Three Dimensional Solids
- Antiferromagnetic spintronics
- Observation of the Magnon Hall Effect
- Quantum magnonics: when magnon spintronics meets quantum information science
- Theory of Thermal Hall Effect in Quantum Magnets
- Theoretical prediction of rotating magnon wavepacket in ferromagnets
- Angular Momentum of Phonons and Einstein-de Haas Effect
- The thermal Hall effect of spin excitations in a Kagome magnet
- Rotational motion of magnon and thermal Hall effect
- Effect of lattice geometry on magnon Hall effect in ferromagnetic insulators
- Thermal Hall Effect of Spins in a Paramagnet
- Two-Dimensional Node-Line Semimetals in a Honeycomb-Kagome Lattice
- Magnon thermal Hall effect in kagome antiferromagnets with Dzyaloshinskii-Moriya interactions
- Kondo Metal and Ferrimagnetic Insulator on the Triangular Kagomé Lattice
- Minimal models for topological Weyl semimetals
- Current-driven ferromagnetic resonance, mechanical torques and rotary motion in magnetic nanostructures
- Magnetic Excitations in the High Tc Iron Pnictides
- Magnon nodal-line semimetals and drumhead surface states in anisotropic pyrochlore ferromagnets
- Dynamics of Einstein - de Haas Effect: Application to Magnetic Cantilever
- On orbital angular momentum conservation in Brillouin light scattering within a ferromagnetic sphere
- Nano-mechanical magnetization reversal
- Topological magnons in a kagome lattice spin system with and Dzyaloshinskii-Moriya interactions
- Difference between angular momentum and pseudoangular momentum
- Orbital Magnetic Moment of Magnons
- Quantum many-body dynamics of the Einstein-de Haas effect
- Dirac Magnon Nodal Loops in Quasi-2D Quantum Magnets
- Magnetic Ordering, Anomalous Lifshitz Transition and Topological Grain Boundaries in Two-Dimensional Biphenylene Network
- Magnetomechanical coupling and ferromagnetic resonance in magnetic nanoparticles
- Topological magnons on the triangular kagome lattice
- Magnetic Excitations of Undoped Iron Oxypnictides
- Dzyaloshinskii-Moriya interaction and magnetic ordering in 1D and 2D at nonzero
- Einstein-de Haas Effect of Topological Magnons
- Two-dimensional Dirac nodal loop magnons in collinear antiferromagnets