Multi-ultraflatbands tunability and effect of spin-orbit coupling in twisted bilayer transition metal dichalcogenides

Abstract

Ultraflatbands that have been theoretically and experimentally detected in a bunch of van der Waals stacked materials showing some peculiar properties, for instance, highly localized electronic states and enhanced electron-electron interactions. In this Letter, using an accurate tight-binding model, we study the formation and evolution of ultraflatbands in transition metal dichalcogenides (TMDCs) under low rotation angles. We find that, unlike in twisted bilayer graphene, ultraflatbands exist in TMDCs for almost any small twist angles and their wave function becomes more localized when the rotation angle decreases. Lattice relaxation, pressure and local deformation can tune the width of the flatbands, as well as their localization. Furthermore, we investigate the effect of spin-orbit coupling on the flatbands and discover spin/orbital/valley locking at the minimum of the conduction band at the K point of the Brillouin zone. The ultraflatbands found in TMDCs with a range of rotation angle below $7^{\circ }$, may provide an ideal platform to study strongly correlated states.

arXiv comment6 pages, 4 figures

References in corpus (41)

• The SIESTA method for ab initio order-N materials simulation
• Efficient index handling of multidimensional periodic boundary conditions
• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
• Moire bands in twisted double-layer graphene
• Energy gaps, topological insulator state and zero-field quantum Hall effect in graphene by strain engineering
• Observation of Moiré Excitons in WSe2/WS2 Heterostructure Superlattices
• Linear-scaling ab-initio calculations for large and complex systems
• Optical detection of Mott and generalized Wigner crystal states in WSe2/WS2 moiré superlattices
• Magic continuum in twisted bilayer WSe2
• Magic Angle Spectroscopy
• Topological insulators in twisted transition metal dichalcogenide homobilayers
• Evolution of Interlayer Coupling in Twisted MoS2 Bilayers
• Hubbard model physics in transition metal dichalcogenide moiré bands
• Electrical Tuning of Valley Magnetic Moment via Symmetry Control
• Spectroscopic signatures of many-body correlations in magic angle twisted bilayer graphene
• Deterministic strain-induced arrays of quantum emitters in a two-dimensional semiconductor
• Ultraflat bands and shear solitons in Moiré patterns of twisted bilayer transition metal dichalcogenides
• Unravelling the intrinsic and robust nature of van Hove singularities in twisted bilayer graphene
• Tight-binding model and direct-gap/indirect-gap transition in single-layer and multi-layer MoS${}_2$
• Novel effects of strains in graphene and other two dimensional materials
• Flat bands in twisted bilayer transition metal dichalcogenides
• Parametrization of Stillinger-Weber Potential Based on Valence Force Field Model: Application to Single-Layer MoS2 and Black Phosphorus
• Modeling electronic structure and transport properties of graphene with resonant scattering centers
• Electronic properties of single-layer and multilayer transition metal dichalcogenides $M{X}_2$ ($M=$ Mo, W and $X=$ S, Se)
• Pressure induced metallization with absence of structural transition in layered MoSe2
• \textit{Ab-initio} Tight-Binding Hamiltonian for Transition Metal Dichalcogenides
• Pressure dependence of the magic twist angle in graphene superlattices
• Broken mirror symmetry in excitonic response of reconstructed domains in twisted MoSe${}_2$/MoSe${}_2$ bilayers
• Spin-Orbit mediated spin relaxation in monolayer MoS2
• Quantum Spin Hall Effect in Two-dimensional Crystals of Transition Metal Dichalcogenides
• Electrically tunable valley dynamics in twisted WSe${}_2$/WSe${}_2$ bilayers
• Strain superlattices and macroscale suspension of Graphene induced by corrugated substrates
• Theory of 2D crystals: graphene and beyond
• Momentum dependence of spin-orbit interaction effects in single-layer and multi-layer transition metal dichalcogenides
• Origin and Evolution of Ultraflatbands in Twisted Bilayer Transition Metal Dichalcogenides: Realization of Triangular Quantum Dot Array
• Large-area, periodic, and tunable intrinsic pseudo-magnetic fields in low-angle twisted bilayer graphene
• Electrically Tunable Flat Bands and Magnetism in Twisted Bilayer Graphene
• Electronic Band Structure of Transition Metal Dichalcogenides from Ab Initio and Slater-Koster Tight-Binding Model
• Electronic localization in twisted bilayer MoS${}_2$ with small rotation angle
• Strain-induced bound states in transition-metal dichalcogenide bubbles

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• Floquet-engineering topological transitions in a twisted transition metal dichalcogenide homobilayer
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• Relaxation effects in twisted bilayer molybdenum disulfide: structure, stability, and electronic properties
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• Tuning flat bands by interlayer interaction, spin-orbital coupling, and external fields in twisted homotrilayer MoS${}_2$
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• Tunneling in an anisotropic cubic Dirac semi-metal
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• Electronic structure and transport in materials with flat bands: 2D materials and quasicrystals
• Renormalized Magic Angles in Asymmetric Twisted Graphene Multilayers
• Atomic relaxation and electronic structure in twisted bilayer MoS2 with rotation angle of 5.09 degrees
• Review of the tight-binding method applicable to the properties of moiré superlattices
• Symmetry-directed electronic and optical properties in a two-dimensional square-lattice ZnPc-MOF
• Intervalley Band Crossing and Transition of Fractional Chern Insulators in Floquet Twisted Bilayer MoTe${}_2$