Tunable moire spinons in magnetically encapsulated twisted van der Waals quantum spin-liquids

Abstract

Quantum spin-liquid van der Waals magnets such as TaS${}_2$, TaSe${}_2$, and RuCl${}_3$ provide a natural platform to explore new exotic phenomena associated with spinon physics, whose properties can be controlled by exchange proximity with ferromagnetic insulators such as CrBr${}_3$. Here we put forward a twisted van der Waals heterostructure based on a quantum spin-liquid bilayer encapsulated between ferromagnetic insulators. We demonstrate the emergence of spinon flat bands and topological spinon states in such heterostructure, where the emergence of a topological gap is driven by the twist. We further show that the spinon bandstructure can be controlled via exchange proximity effect to the ferromagnetic leads. We finally show how by combining small magnetic fields with tunneling spectroscopy, magnetically encapsulated heterostructures provide a way of characterizing the nature of the quantum spin-liquid state. Our results put forward twisted quantum spin-liquid bilayers as potential platforms for exotic moire spinon phenomena, demonstrating the versatility of magnetic van der Waals heterostructures.

7 pages, 4 figures, comments are welcome

References in corpus (27)

• Magnetic 2D materials and heterostructures
• Flat Bands in Slightly Twisted Bilayer Graphene
• Spin Dynamics of the Spin-1/2 Kagome Lattice Antiferromagnet ZnCu_3(OH)_6Cl_2
• Defect scattering in graphene
• Projected wavefunction study of Spin-1/2 Heisenberg model on the Kagome lattice
• Proximity-induced ferromagnetism in graphene revealed by anomalous Hall effect
• Scattering Continuum and Possible Fractionalized Excitations in $\alpha$-RuCl${}_3$
• Intervalley scattering, long-range disorder, and effective time reversal symmetry breaking in graphene
• Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors
• Flatbands in twisted double bilayer graphene
• Band structure and topological property of twisted double bilayer graphenes
• High-temperature topological superconductivity in twisted double layer copper oxides
• Gate-controllable magneto-optic Kerr effect in layered collinear antiferromagnets
• Scalable Tight-Binding Model for Graphene
• Local Probes for Charge-Neutral Edge States in Two-Dimensional Quantum Magnets
• Band topology and quantum spin Hall effect in bilayer graphene
• Tunneling spectroscopy of quantum spin liquids
• Gate-Tunable Fractional Chern Insulators in Twisted Double Bilayer Graphene
• Electronic and magnetic characterization of epitaxial CrBr${}_3$ monolayers
• Impurity-induced triple point fermions in twisted bilayer graphene
• Electrical band flattening, valley flux, and superconductivity in twisted trilayer graphene
• Spin excitations of a proximate Kitaev quantum spin liquid realized in Cu${}_2$IrO${}_3$
• Landau Levels as a Probe for Band Topology in Graphene Moiré Superlattices
• Spontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Graphene
• Impurity-induced resonant spinon zero modes in Dirac quantum spin-liquids
• Exchange-bias controlled correlations in magnetically encapsulated twisted van der Waals dichalcogenides
• Magnon bands in twisted bilayer honeycomb quantum magnets

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• Extended magic phase in twisted graphene multilayers
• Spin-orbit correlations and exchange-bias control in twisted Janus dichalcogenide multilayers
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• Controlling magnetic frustration in 1T-TaS${}_2$ via Coulomb engineered long-range interactions
• Hamiltonian-learning quantum magnets with non-local impurity tomography
• Moiré spintronics: Emergent phenomena, material realization and machine learning accelerating discovery