Magnetic States of Graphene Proximitized Kitaev Materials

Abstract

Single layer $\alpha$-ruthenium trichloride ($\alpha -\mathrm{RuC}{\mathrm{l}}_3$) has been proposed as a potential quantum spin liquid. Graphene/$\mathrm{RuC}{\mathrm{l}}_3$ heterobilayers have been extensively studied with a focus on the large interlayer electron transfer that dopes both materials. Here we examine the interplay between the competing magnetic state of $\mathrm{RuC}{\mathrm{l}}_3$ layer and graphene electronic properties. We perform self-consistent Hartree-Fock calculations on a Hubbard-Kanamori model of the $4d^5$ $t_{2g}$ electrons of $\alpha -\mathrm{RuC}{\mathrm{l}}_3$ and confirm that out-of-plane ferromagnetic and zigzag antiferromagnetic states are energetically competitive. We show that the influence of hybridization between graphene and $\alpha -\mathrm{RuC}{\mathrm{l}}_3$ bands is strongly sensitive to the magnetic configuration of $\mathrm{RuC}{\mathrm{l}}_3$ and the relative orientations of the two layers. We argue that strong hybridization leads to graphene magneto-resistance and that it may tilt the balance between closely competing magnetic states. Our analysis can be applied to any van der Waals heterobilayer system with weak interlayer hybridization and allows for arbitrary lattice constant mismatch and relative orientation.

References in corpus (17)

• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• Magnetic 2D materials and heterostructures
• Strong electronic correlations from Hund's coupling
• Magnetic order in $\alpha$-RuCl${}_3$: a honeycomb lattice quantum magnet with strong spin-orbit coupling
• Superlattice-induced insulating states and valley-protected orbits in twisted bilayer graphene
• Kitaev magnetism in honeycomb RuCl3 with intermediate spin-orbit coupling
• The Quantum Twisting Microscope
• Graphene/$\alpha$-RuCl${}_3$: An Emergent 2D Plasmonic Interface
• Spin-split band hybridization in graphene proximitized with $\alpha$-RuCl${}_3$ nanosheets
• Modulation Doping via a 2d Atomic Crystalline Acceptor
• Magnetic anisotropy reversal driven by structural symmetry-breaking in monolayer α-RuCl3
• Nanometer-scale lateral p-n junctions in graphene/$\alpha$-RuCl${}_3$ heterostructures
• Anomalous Quantum Oscillations in a Heterostructure of Graphene on a Proximate Quantum Spin Liquid
• Ultra-sharp lateral $p\text{-}n$ junctions in modulation-doped graphene
• Tunneling spectroscopic signatures of charge doping and associated Mott transition in $\alpha$-RuCl${}_3$ in proximity to graphite
• Magnetic anisotropy energies and metal-insulator transitions in monolayers of $\alpha$-RuCl${}_3$ and OsCl${}_3$ on graphene
• Flat and Correlated Plasmon Bands in Graphene/$\alpha$-RuCl${}_3$ Heterostructures

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