Mapping twist-tuned multiband topology in bilayer WSe${}_2$

Abstract

Semiconductor moiré superlattices have been shown to host a wide array of interaction-driven ground states. However, twisted homobilayers have been difficult to study in the limit of large moiré wavelength, where interactions are most dominant. Here, we conduct local electronic compressibility measurements of twisted bilayer WSe${}_2$ (tWSe${}_2$) at small twist angles. We demonstrate multiple topological bands which host a series of Chern insulators at zero magnetic field near a 'magic angle' around $1.23^{\circ }$. Using a locally applied electric field, we induce a topological quantum phase transition at one hole per moiré unit cell. Our work establishes the topological phase diagram of a generalized Kane-Mele-Hubbard model in tWSe${}_2$, demonstrating a tunable platform for strongly correlated topological phases.

This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science 384 (doi below)

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Cited by in corpus (55)

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• Polarization-driven band topology evolution in twisted MoTe${}_2$ and WSe${}_2$
• Charge-transfer Contact to a High-Mobility Monolayer Semiconductor
• Superconductivity and quantized anomalous Hall in rhombohedral graphene
• Stability of Anomalous Hall Crystals in multilayer rhombohedral graphene
• Interplay between topology and correlations in the second moiré band of twisted bilayer MoTe2
• Quantum anomalous Hall crystal at fractional filling of moiré superlattices
• Superconductivity and spin canting in spin-orbit proximitized rhombohedral trilayer graphene
• Superconductivity in twisted transition metal dichalcogenide homobilayers
• Topological bound on structure factor
• Helical trilayer graphene: a moiré platform for strongly-interacting topological bands
• Theory of Correlated Insulators and Superconductor at $\nu =1$ in Twisted WSe${}_2$
• Visualizing the microscopic origins of topology in twisted molybdenum ditelluride
• Extended quantum anomalous Hall effect in moiré structures: phase transitions and transport
• Experimental signature of layer skyrmions and implications for band topology in twisted WSe2 bilayers
• Long-lived Topological Flatband Excitons in Semiconductor Moiré Heterostructures: a Bosonic Kane-Mele Model Platform
• Electronic transport, metal-insulator transition, and Wigner crystallization in transition metal dichalcogenide monolayers
• Twist-angle evolution of the intervalley-coherent antiferromagnet in twisted WSe${}_2$
• Theory of Topological Superconductivity and Antiferromagnetic Correlated Insulators in Twisted Bilayer WSe${}_2$
• Non-Abelian spin Hall insulator
• Topological Kondo semimetal and insulator in AB-stacked heterobilayer transition metal dichalcogenides
• Possible Sliding Regimes in Twisted Bilayer WTe${}_2$
• Hofstadter spectrum of Chern bands in twisted transition metal dichalcogenides
• Interacting phase diagram of twisted bilayer MoTe${}_2$ in magnetic field
• Topological Chiral Superconductivity Mediated by Intervalley Antiferromagnetic Fluctuations in Twisted Bilayer WSe${}_2$
• Observation of Ferromagnetic Phase in the Second Moiré Band of Twisted MoTe2
• Single-particle spectral function of fractional quantum anomalous Hall states
• Quantum anomalous, spin, and valley Hall effects in pentalayer rhombohedral graphene moiré superlattices
• Electric-field switchable chirality in rhombohedral graphene Chern insulators stabilized by tungsten diselenide
• Moiré Band Engineering in Twisted Trilayer WSe2
• Chiral superconductivity from spin polarized Chern band in twisted MoTe${}_2$
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• Topological magnons and domain walls in twisted bilayer MoTe${}_2$
• Itinerant topological magnons and spin excitons in twisted transition metal dichalcogenides: Mapping electron topology to spin counterpart
• Quantum Phases in Twisted Homobilayer Transition Metal Dichalcogenides
• Angle evolution of the superconducting phase diagram in twisted bilayer WSe2
• Strong atomic reconstruction in twisted bilayers of highly flexible InSe: Machine-Learned Interatomic Potential and continuum model approaches
• Orbital Magnetization of Correlated States in Twisted Bilayer Transition Metal Dichalcogenides
• Anisotropic moiré band flattening in twisted bilayers of M-valley MXenes
• Chiral Spin Liquid and Quantum Phase Transition in the Triangular Lattice Hofstadter-Hubbard Model
• Quantum-geometric dipole: a topological boost to flavor ferromagnetism in flat bands
• Magnetic Hofstadter cascade in a twisted semiconductor homobilayer
• Non-Abelian Chern band in rhombohedral graphene multilayers
• Incipient quantum spin Hall insulator under strong correlations
• Optical signatures of -1/3 fractional quantum anomalous Hall state in twisted MoTe2
• Striped Spin Density Wave in a Graphene/Black Phosphorous Heterostructure
• Theory for Lattice Relaxation in Marginal Twist Moirés
• Probing Quantum Anomalous Hall States in Twisted Bilayer WSe2 via Attractive Polaron Spectroscopy
• Anomalous Landau level gaps near magnetic transitions in monolayer WSe${}_2$
• Onset of spin-valley order and Stoner boundaries in twisted WSe${}_2$
• The antiferromagnetic Chern insulator phase in the Kane-Mele-Hubbard model
• Robustness of real-space topology in moiré systems