Magnon valley Hall effect in CrI3-based vdW heterostructures

Abstract

Magnonic excitations in the two-dimensional (2D) van der Waals (vdW) ferromagnet CrI3 are studied. We find that bulk magnons exhibit a non-trivial topological band structure without the need for Dzyaloshinskii-Moriya (DM) interaction. This is shown in vdW heterostructures, consisting of single-layer CrI3 on top of different 2D materials as MoTe2, HfS2 and WSe2. We find numerically that the proposed substrates modify substantially the out-of-plane magnetic anisotropy on each sublattice of the CrI3 subsystem. The induced staggered anisotropy, combined with a proper band inversion, leads to the opening of a topological gap of the magnon spectrum. Since the gap is opened non-symmetrically at the K+ and K- points of the Brillouin zone, an imbalance in the magnon population between these two valleys can be created under a driving force. This phenomenon is in close analogy to the so-called valley Hall effect (VHE), and thus termed as magnon valley Hall effect (MVHE). In linear response to a temperature gradient we quantify this effect by the evaluation of the temperature-dependence of the magnon thermal Hall effect. These findings open a different avenue by adding the valley degrees of freedom besides the spin, in the study of magnons.

References in corpus (42)

• Quantum Spin Hall Effect in Graphene
• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Nonlocal van der Waals density functional: The simpler the better
• The electronic properties of bilayer graphene
• On the origin of magnetic anisotropy in two dimensional CrI${}_3$
• SCAN+rVV10: A promising van der Waals density functional
• The Zak phase and the existence of edge states in graphene
• Topological chiral magnonic edge mode in a magnonic crystal
• Edge states in Graphene: from gapped flat band to gapless chiral modes
• Valley Manipulation by Optically Tuning the Magnetic Proximity Effect in WSe${}_2$/CrI${}_3$ Heterostructures
• Layer-dependent properties of SnS2 and SnSe2 novel two-dimensional materials
• Topological Magnon Insulator in Insulating Ferromagnet
• PyProcar: A Python library for electronic structure pre/post-processing
• Topological spin excitations in honeycomb ferromagnet CrI${}_3$
• Edge states and the bulk-boundary correspondence in Dirac Hamiltonians
• Spin Nernst Effect of Magnons in Collinear Antiferromagnets
• Collective spin excitations of helices and magnetic skyrmions: review and perspectives of magnonics in non-centrosymmetric magnets
• Structural and Electrical Properties of MoTe${}_2$ and MoSe${}_2$ Grown by Molecular Beam Epitaxy
• A first theoretical realization of honeycomb topological magnon insulator
• Magnon spin Nernst effect in antiferromagnets
• A Realization of the Haldane-Kane-Mele Model in a System of Localized Spins
• Fundamental Spin Interactions Underlying the Magnetic Anisotropy in the Kitaev Ferromagnet CrI${}_3$
• Proximity exchange effects in MoSe${}_2$ and WSe${}_2$ heterostructures with CrI${}_3$: twist angle, layer, and gate dependence
• Topological Magnons in Kitaev Magnets at High Fields
• Topological spin waves in the atomic-scale magnetic skyrmion crystal
• Magnon thermal Hall effect in kagome antiferromagnets with Dzyaloshinskii-Moriya interactions
• Topological excitations in the ferromagnetic Kitaev-Heisenberg model
• Orbitally-resolved ferromagnetism of monolayer CrI${}_3$
• Evaluation of van der Waals density functionals for layered materials
• Atomic structure of intrinsic and electron-irradiation-induced defects in MoTe2
• Strong and Tunable Spin Lifetime Anisotropy in Dual-Gated Bilayer Graphene
• Topological magnon amplification
• Topological magnons in a kagome lattice spin system with $XXZ$ and Dzyaloshinskii-Moriya interactions
• Tunable spin-polarized edge currents in proximitized transition metal dichalcogenides
• Lateral heterostructures and one-dimensional interfaces in 2D transition metal dichalcogenides
• Anomalous Hall effect in 2$H$-phase transition-metal dichalcogenide monolayers on ferromagnetic substrates
• Structural and magnetic response of CrI3 monolayer to electric field
• Bilayer graphene under pressure: Electron-hole Symmetry Breaking, Valley Hall Effect, and Landau Levels
• Strain-Induced Topological Magnon Phase Transitions: Applications to Kagome-Lattice Ferromagnets
• Marginal topological properties of graphene: a comparison with topological insulators
• Anomalous magnon Nernst effect of topological magnonic materials

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• Theory of magnetism in the van der Waals magnet CrI3
• Intrinsic nonlinear thermal Hall transport of magnons: A Quantum kinetic theory approach
• Topological phase transition in magnon bands in a honeycomb ferromagnet driven by sublattice symmetry breaking
• Temperature-Induced Magnonic Chern Insulator in Collinear Antiferromagnets
• Non-linear magnon transport in a bilayer van der Waals antiferromagnets
• Theoretical realization of rich magnon topology by symmetry-breaking in honeycomb bilayer ferromagnets
• Time-dependent strain-tuning topological magnon phase transition
• Magnon Hall effect in antiferromagnetic lattices
• Magnonics along the wall in Bimeron Chain Domain Walls
• Robustness of topological magnons in disordered arrays of skyrmions
• Magnonic Thermal Machines
• Quantized Toroidal Waves on Ferrotoroidal Magnets
• Finite-temperature topological magnons in honeycomb ferromagnets with sublattice asymmetries
• Transport of Dirac magnons driven by gauge fields
• Generation of phonon quantum states and quantum correlations among single photon emitters in hexagonal boron nitride