Tuning flat bands by interlayer interaction, spin-orbital coupling, and external fields in twisted homotrilayer MoS
arXiv:2309.03089 · doi:10.1103/PhysRevB.109.085118
Abstract
Ultraflat bands have already been detected in twisted bilayer graphene and twisted bilayer transition-metal dichalcogenides, which provide a platform to investigate strong correlations. In this paper, the electronic properties of twisted trilayer molybdenum disulfide (TTM) are investigated via an accurate tight-binding Hamiltonian. We find that the highest valence bands are derived from the -point of the constituent monolayer, and they exhibit a graphenelike dispersion or become isolated flat bands that are dependent on the starting stacking arrangements. The lattice relaxation, local deformation, and external fields can significantly tune the electronic structures of TTM. After introducing the spin-orbital coupling effect, we find a spin-valley-layer locking effect at the minimum of the conduction band at the - and -point of the Brillouin zone, which may provide a platform to study optical properties and magnetoelectric effects.
References in corpus (9)
- Electric Field Effect in Atomically Thin Carbon Films
- Observation of Moiré Excitons in WSe2/WS2 Heterostructure Superlattices
- Electric field tunable unconventional superconductivity in alternating twist magic-angle trilayer graphene
- Modeling electronic structure and transport properties of graphene with resonant scattering centers
- Electronic localization in twisted bilayer MoS with small rotation angle
- Flat bands, strains, and charge distribution in twisted-bilayer hBN
- Collective excitations and plasmon spectrum in twisted bilayer graphene near the magic angle
- Lattice relaxation, mirror symmetry and magnetic field effects on ultraflat bands in twisted trilayer graphene
- Realizing a tunable honeycomb lattice in ABBA-stacked twisted double bilayer WSe