Magnon bands in twisted bilayer honeycomb quantum magnets
arXiv:2008.11640 · doi:10.1088/1674-1056/abeee5
Abstract
We study the magnon bands of twisted bilayer honeycomb quantum magnets using linear spin wave theory. Although the interlayer coupling can be ferromagnetic or antiferromagnetic, we keep the intralayer one ferromagnetic to avoid possible frustration. For the interlayer ferromagnetic case, we find the magnon bands have similar features with the corresponding electronic energy spectrums. Although the linear dispersions near the Dirac points are preserved in the magnon bands of twisted bilayer magnets, their slopes are graduately reduced with the decrease of the twist angles. On the other hand, the interlayer antiferromagnetic couplings generate quite different magnon spectra. The two single-layered magnon spectra are usually undecoupled due to the opposite orientations of the spins in the two layers. We also develop a low-energy continuous theory for very small twist angles, which has been verified to fit well with the exact tight-binding calculations. Our results may be experimentally observed due to the rapid progress in two-dimensional magnetic materials.
arXiv comment7 pages, 5 figures
References in corpus (42)
- 2D materials and van der Waals heterostructures
- Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
- Moire bands in twisted double-layer graphene
- Tuning superconductivity in twisted bilayer graphene
- Magnetic 2D materials and heterostructures
- Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene
- Electrical Control of 2D Magnetism in Bilayer CrI3
- Giant Tunneling Magnetoresistance in Spin-Filter van der Waals Heterostructures
- Probing magnetism in 2D van der Waals crystalline insulators via electron tunneling
- Flat Bands in Slightly Twisted Bilayer Graphene
- Localization of Dirac electrons by Moire patterns in graphene bilayers
- Stacking-Dependent Magnetism in Bilayer CrI
- Signatures of Gate-Tunable Superconductivity in Trilayer Graphene/Boron Nitride Moiré Superlattice
- Continuum Model of the Twisted Bilayer
- Evidence of Gate-Tunable Mott Insulator in Trilayer Graphene-Boron Nitride Moiré Superlattice
- Correlated states in twisted double bilayer graphene
- Maximally-localized Wannier orbitals and the extended Hubbard model for the twisted bilayer graphene
- Probing magnetism in 2D materials at the nanoscale with single spin microscopy
- Electronic properties of graphene-based bilayer systems
- Decoupling superconductivity and correlated insulators in twisted bilayer graphene
- A mechanism for anomalous Hall ferromagnetism in twisted bilayer graphene
- Chiral SDW and d + id superconductivity in the magic-angle twisted bilayer-graphene
- Correlated Insulating States in Twisted Double Bilayer Graphene
- Ferromagnetic Mott State in Twisted Graphene Bilayers at the Magic Angle
- Flatbands in twisted double bilayer graphene
- Unconventional superconductivity in nearly flat bands in twisted bilayer graphene
- Strain-tunable magnetic and electronic properties of monolayer CrI3
- Direct observation of 2D magnons in atomically thin CrI
- Particle-Hole Duality, Emergent Fermi Liquids and Fractional Chern Insulators in Moiré Flatbands
- Triangular antiferromagnetism on the honeycomb lattice of twisted bilayer graphene
- Antiferromagnetically ordered Mott insulator and superconductivity in twisted bilayer graphene: A quantum Monte carlo study
- Three-dimensional magnetic critical behavior in CrI
- Critical behavior of quasi-two-dimensional semiconducting ferromagnet CrGeTe
- Cold atoms in twisted bilayer optical potentials
- General continuum model for twisted bilayer graphene and arbitrary smooth deformations
- Topological magnon bands in the zigzag and stripy phases of antiferromagnetic honeycomb lattice
- Ferromagnetism and superconductivity in twisted double bilayer graphene
- Ferromagnetism and its stability from the one-magnon spectrum in twisted bilayer graphene
- Harmonic Fingerprint of Unconventional Superconductivity in Twisted Bilayer Graphene
- Noisy defects in a doped Mott insulator
- Twisted Kitaev Bilayers and the Moiré Ising Model
- Antiferromagnetism and chiral d-wave superconductivity from an effective model for twisted bilayer graphene