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TT: Fachverband Tiefe Temperaturen

TT 86: Correlated Magnetism – Spin Liquids II

TT 86.5: Vortrag

Donnerstag, 12. März 2026, 16:00–16:15, CHE/0091

Exactly solvable spin liquids in Kitaev bilayers and moiré superlattices — •Ivan Dutta^1,2, Anamitra Mukherjee^1,2, Onur Erten³, and Kush Saha^1,2 — ¹National Institute of Science Education and Research, Jatni, 752050, India — ²Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India — ³Department of Physics, Arizona State University, Tempe, Arizona 85287, USA

Building on the recent advancements on moiré superlattices, we propose an exactly solvable model with Kitaev-type interactions on a bilayer honeycomb lattice for both AA stacking and moiré superlattices. Employing Monte Carlo simulations and variational analysis, we uncover a rich variety of phases where the intra and interlayer Z2 fluxes (visons) are arranged in a periodic fashion in the ground state, tuned by interlayer coupling and out-of-plane external magnetic field. We further extend our model to moiré superlattices at various commensurate twist angles around two distinct twist centers represented by C3z and C6z of the honeycomb lattice. Our simulations reveal generalized patterns of plaquette values correlated with the AA or AB stacking regions across the moiré unit cell. In addition, depending on the twist angle, twist center and interlayer coupling, moiré superlattices exhibit a variety of gapped and gapless spin liquid phases and can also host corner and edge modes. Our results highlight the rich physics in bilayer and twisted bilayer models of exactly solvable quantum spin liquids.

Keywords: Quantum Spin Liquids; Kitaev Model; Spin Lattice Model; Moiré system; Bilayer films