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Journal Article

Kitaev spin-orbital bilayers and their moire superlattices


Moessner,  Roderich
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Nica, E. M., Akram, M., Vijayvargia, A., Moessner, R., & Erten, O. (2023). Kitaev spin-orbital bilayers and their moire superlattices. npj Quantum Materials, 8(1): 9. doi:10.1038/s41535-023-00541-2.

Cite as: https://hdl.handle.net/21.11116/0000-000D-00DA-D
We determine the phase diagram of a bilayer, Yao-Lee spin-orbital model with inter-layer interactions (J), for several stackings and moir & eacute; superlattices. For AA stacking, a gapped Z(2) quantum spin liquid phase emerges at a finite J(c). We show that this phase survives in the well-controlled large-J limit, where an isotropic honeycomb toric code emerges. For moir & eacute; superlattices, a finite -q inter-layer hybridization is stabilized. This connects inequivalent Dirac points, effectively "untwisting' the system. Our study thus provides insight into the spin-liquid phases of bilayer spin-orbital Kitaev materials.