Kagome chiral spin liquid in transition metal dichalcogenide moiré bilayers Article Swipe

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Condensed matter physics Spins Spin (aerodynamics) Phase diagram Quantum spin liquid Frustration Materials science Transition metal Phase transition Physics Phase (matter) Electron Spin polarization Chemistry Quantum mechanics Thermodynamics Catalysis Biochemistry

Johannes Motruk , Dario Rossi , Dmitry A. Abanin , Louk Rademaker ·

YOU? · · 2022 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2211.15696 · OA: W4310509346

At $n=3/4$ filling of the moiré flat band, transition metal dichalcogenide moiré bilayers will develop kagome charge order. We derive an effective spin model for the resulting localized spins and find that its further neighbor spin interactions can be much less suppressed than the corresponding electron hopping strength. Using density matrix renormalization group simulations, we study its phase diagram and, for realistic model parameters relevant for WSe$_2$/WS$_2$, we show that this material can realize the exotic chiral spin liquid phase and the highly debated kagome spin liquid. Our work thus demonstrates that the frustration and strong interactions present in TMD heterobilayers provide an exciting platform to study spin liquid physics.