The emergence of interface states in graphene/transition metal dichalcogenides heterostructure with lateral interface
arXiv:2304.06086 · doi:10.1103/PhysRevB.108.035415
Abstract
The relative strength of different proximity spin-orbit couplings in graphene on transition metal dichalcogenides (TMDC) can be tuned via the metal composition in the TMDC layer. While Gr/MoSe, has a normal gap, proximity to WSe instead leads to valley-Zeeman-driven inverted bands. Although the index vanishes, these systems enable a concentration-dependent topological crossover with band gap closure when graphene is stacked on a composite or alloyed TMDC layer. This is due to a nonzero Berry curvature at the individual valleys and a change of the valley Chern index at a critical composition ratio. Therefore, inherently, we also expect that stacked heterostructures of graphene on composite TMDC layers should host localised boundary modes due to the presence of Gr/WSe- and Gr/MoSe-like domains with opposite valley Chern indices. In this study, we show that a Gr/(Mo-W)Se heterostructure with a lateral interface in the TMDC layer can indeed host topologically protected in-gap propagating modes, similar to those at the border of commensurate AB and BA domains in biased minimally-twisted bilayer graphene. However, the stability of these modes depends crucially on the system size. We demonstrate that the electronic behaviour of Gr/(Mo-W)Se heterostructures evolves from a homogeneous effective medium to a superposition of domain-localised bands and zero-energy branch crossings as the domain size in the alloyed TMDC layer is increased.
arXiv comment10 pages and 4 figures
References in corpus (57)
- Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
- Quantum Spin Hall Effect in Graphene
- Topological Order and the Quantum Spin Hall Effect
- Graphene Spintronics
- Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets
- Atomic and electronic reconstruction at van der Waals interface in twisted bilayer graphene
- Van der Waals heterostructures for spintronics and opto-spintronics
- Spin-Orbit Proximity Effect in Graphene
- Sequential Edge-Epitaxy in 2D Lateral Heterostructures
- Topological confinement in bilayer graphene
- Strong interface-induced spin-orbit coupling in graphene on WS2
- Valley Chern Numbers and Boundary Modes in Gapped Bilayer Graphene
- Edge states in Graphene: from gapped flat band to gapless chiral modes
- Superconductivity without insulating states in twisted bilayer graphene stabilized by monolayer WSe
- Local defects and ferromagnetism in graphene layers
- Density functional perturbation theory for gated two-dimensional heterostructures: Theoretical developments and application to flexural phonons in graphene
- Trivial and inverted Dirac bands, and emergence of quantum spin Hall states in graphene on transition-metal dichalcogenides
- RKKY in half-filled bipartite lattices: graphene as an example
- Topologically Protected Helical States in Minimally Twisted Bilayer Graphene
- Gate-controlled topological conducting channels in bilayer graphene
- Strongly anisotropic spin relaxation in graphene/transition metal dichalcogenide heterostructures at room temperature
- Direct imaging of topological edge states at a bilayer graphene domain wall
- Spin-orbit driven band inversion in bilayer graphene by van der Waals proximity effect
- Giant Spin Lifetime Anisotropy in Graphene Induced by Proximity Effects
- Large Proximity-Induced Spin Lifetime Anisotropy in Transition Metal Dichalcogenide/Graphene Heterostructures
- A two-dimensional spin field-effect transistor
- Spin transport in graphene/transition metal dichalcogenide heterostructures
- Electronic Highways in Bilayer Graphene
- Model spin-orbit coupling Hamiltonians for graphene systems
- Valley-Hall Kink and Edge States in Multilayer Graphene
- Tunable spin-orbit coupling and symmetry-protected edge states in graphene/WS
- Origin and magnitude of 'designer' spin-orbit interaction in graphene on semiconducting transition metal dichalcogenides
- Helical networks in twisted bilayer graphene under interlayer bias
- Transport through a network of topological states in twisted bilayer graphene
- Strong electron-hole symmetric Rashba spin-orbit coupling in graphene/monolayer transition metal dichalcogenide heterostructures
- Enhanced Optoelectronic Response in Bilayer Lateral Heterostructures of Transition Metal Dichalcogenides
- Induced spin-orbit coupling in twisted graphene-TMDC heterobilayers: twistronics meets spintronics
- Strong Spin-Orbit Interaction Induced in Graphene by Monolayer WS
- Spin Hall effect and Weak Antilocalization in Graphene/Transition Metal Dichalcogenide Heterostructures
- Topological kink states at a tilt boundary in gated multi-layer graphene
- Helical Network Model for Twisted Bilayer Graphene
- Indirect Exchange and Ruderman-Kittel-Kasuya-Yosida (RKKY) Interactions in Magnetically-Doped Graphene
- Magnetotransport in heterostructures of transition metal dichalcogenides and graphene
- Protected pseudohelical edge states in proximity graphene ribbons and flakes
- Electrical control of valley-Zeeman spin-orbit coupling-induced spin precession at room temperature
- Chiral states in bilayer graphene: magnetic field dependence and gap opening
- Helical States in Curved Bilayer Graphene
- Perfect one-dimensional chiral states in biased twisted bilayer graphene
- Microscopic Theory of Spin Relaxation Anisotropy in Graphene with Proximity-Induced Spin-Orbit Coupling
- Mass inversion in graphene by proximity to dichalcogenide monolayer
- Electric-field-tunable valley Zeeman effect in bilayer graphene heterostructures: Realization of the spin-orbit valve effect
- Graphene-based heterojunction between two topological insulators
- Domain wall competition in the Chern insulating regime of twisted bilayer graphene
- Topological phases and twisting of graphene on a dichalcogenide monolayer
- Energetics and Structure of Domain Wall Networks in Minimally Twisted Bilayer Graphene under Strain
- RKKY interaction between extended magnetic defect lines in graphene
- Robust propagating in-gap modes due to spin-orbit domain walls in graphene