Magnetic field effect on topological spin excitations in CrI${}_3$

Abstract

The search for topological spin excitations in recently discovered two-dimensional (2D) van der Waals (vdW) magnetic materials is important because of their potential applications in dissipation-less spintronics. In the 2D vdW ferromagnetic (FM) honeycomb lattice CrI${}_3$(T${}_C$= 61 K), acoustic and optical spin waves were found to be separated by a gap at the Dirac points. The presence of such a gap is a signature of topological spin excitations if it arises from the next nearest neighbor(NNN) Dzyaloshinskii-Moriya (DM) or bond-angle dependent Kitaev interactions within the Cr honeycomb lattice. Alternatively, the gap is suggested to arise from an electron correlation effect not associated with topological spin excitations. Here we use inelastic neutron scattering to conclusively demonstrate that the Kitaev interactions and electron correlation effects cannot describe spin waves, Dirac gap and their in-plane magnetic field dependence. Our results support the DM interactions being the microscopic origin of the observed Dirac gap. Moreover, we find that the nearest neighbor (NN) magnetic exchange interactions along the axis are antiferromagnetic (AF)and the NNN interactions are FM. Therefore, our results unveil the origin of the observedcaxisAF order in thin layers of CrI${}_3$, firmly determine the microscopic spin interactions in bulk CrI${}_3$, and provide a new understanding of topology-driven spin excitations in 2D vdW magnets.

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• Beyond Kitaev physics in strong spin-orbit coupled magnets
• Spin Dynamics in van der Waals Magnetic Systems
• Progress and Prospects in Two-Dimensional Magnetism of van der Waals Materials
• Massless Dirac magnons in the two dimensional van der Waals honeycomb magnet CrCl3
• Anisotropic magnon damping by zero-temperature quantum fluctuations in ferromagnetic CrGeTe${}_3$
• Magnon-phonon interactions enhance the gap at the Dirac point in the spin-wave spectra of CrI${}_3$ two-dimensional magnets
• Gaps in Topological Magnon Spectra: Intrinsic vs. Extrinsic Effects
• Stacking-dependent topological magnons in bilayer CrI${}_3$
• Direct optical probe of magnon topology in two-dimensional quantum magnets
• Observation of spin-wave moiré edge and cavity modes in twisted magnetic lattices
• Determining Kitaev interaction in spin-$S$ honeycomb Mott insulators
• Topological phase transition in magnon bands in a honeycomb ferromagnet driven by sublattice symmetry breaking
• Visualization of moiré magnons in monolayer ferromagnet
• Tunable magnon topology in monolayer CrI${}_3$ under external stimuli
• Pseudo-Goldstone modes and dynamical gap generation from order-by-thermal-disorder
• Higher-order Topological Phases of Magnons in van der Waals Honeycomb Ferromagnets
• Quantum liquids of the S=3/2 Kitaev honeycomb and related Kugel-Khomskii models
• Tunable topological magnon-polaron states and anomalous Hall phenomena in two-dimensional ferromagnetic insulators
• Thermal Hall effect in a van der Waals ferromagnet CrI3
• Observation of helimagnetism in the candidate ferroelectric CrI${}_2$
• Topological magnon gap engineering in van der Waals CrI${}_3$ ferromagnets
• Signatures of Kitaev interactions in the van der Waals ferromagnet VI3
• Exchange interactions and spin dynamics in the layered honeycomb ferromagnet CrI${}_3$
• Intrinsic Nernst effect of the magnon orbital moment in a honeycomb ferromagnet
• Spin Waves and Dirac Magnons in a Honeycomb Lattice Zig-zag Antiferromagnet BaNi2(AsO4)2
• First-principles study of the gap in the spin excitation spectrum of the CrI${}_3$ honeycomb ferromagnet
• Superexchange and spin-orbit coupling in monolayer and bilayer chromium trihalides
• Antiferromagnetic-ferromagnetic homostructures with Dirac magnons in van der Waals magnet CrI${}_3$
• Skyrmions in van der Waals centrosymmetric materials with Dzyaloshinskii-Moriya interactions
• Sign Changes in Heat, Spin, and Orbital Magnon Transport Coefficients in Kitaev Ferromagnets
• Thermal Transport Properties of Magnons on the $\alpha$-T${}_3$ Lattice
• Magnon dispersion and spin transport in CrCl${}_3$ bilayers under different strain-induced magnetic states
• Intrinsic Spin Nernst Effect and Chiral Edge Modes in van der Waals Ferromagnetic Insulators: Dzyaloshinskii-Moriya vs. Kitaev Interactions
• Local spin-flip transitions induced by magnetic quantum impurities in two-dimensional magnets
• Helimagnetism in CrBr${}_2$ and CrIBr
• Magnon sensing of NO, NO${}_2$ and NH${}_3$ gas capture on CrSBr monolayer
• Magnetic domain wall dynamics under external electric field in bilayer CrI${}_3$
• Topological magnon-polaron transport in a bilayer van der Waals magnet
• Interlayer superexchange in bilayer chromium trihalides
• Interacting Dirac magnons in the van der Waals ferromagnet CrBr${}_3$
• Angular-Dependent Thermal Hall Effect in a Honeycomb Magnet: Disentangling Kitaev and Dzyaloshinskii-Moriya Interactions
• Scattering Theory of Chiral Edge Modes in Topological Magnon Insulators
• Magnetic Order and Magneto-Elasticity in the Electronic Excitations of Gd-$i$-MAX
• Impact of the honeycomb spin-lattice on topological magnons and edge states in ferromagnetic 2D skyrmion crystals
• Self-consistent renormalized spin-wave theory of magnetic and topological transitions in two-dimensional honeycomb ferromagnets
• Spin-orbit coupling controlled two-dimensional magnetism in chromium trihalides
• Evidence for magnetoelastic coupling and chiral magnetic ground state in quasi-van der Waals tr-Cr${}_{1.22}$Te${}_2$