Defect density of order 10^{-4} to 10^{-2} in the Kitaev honeycomb model drives a true finite-T transition to a chiral spin liquid with T_c approximately 2 n_d, mediated by emergent r^{-2.7} ferromagnetic interactions between defect chiralities.
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Degenerate perturbation theory on a multiorbital Hubbard model shows isotropic superexchange arises mainly from ground-state Kramers doublet hopping while anisotropy comes from excited multiplets, yielding an orbital design rule for quasi-isotropic exchange in rare-earth insulators.
Simulations of a square-lattice spin model with bilinear and biquadratic interactions reveal successive field-driven transitions to single-Q, double-Q, and multiple inequivalent quadruple-Q states with distinct phase locking, amplitude distributions, and scalar spin chirality.
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Chiral spin liquid instability of the Kitaev honeycomb model with crystallographic defects
Defect density of order 10^{-4} to 10^{-2} in the Kitaev honeycomb model drives a true finite-T transition to a chiral spin liquid with T_c approximately 2 n_d, mediated by emergent r^{-2.7} ferromagnetic interactions between defect chiralities.
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Design Principles for Quasi-Isotropic Exchange in Rare-Earth Quantum Magnets
Degenerate perturbation theory on a multiorbital Hubbard model shows isotropic superexchange arises mainly from ground-state Kramers doublet hopping while anisotropy comes from excited multiplets, yielding an orbital design rule for quasi-isotropic exchange in rare-earth insulators.
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Field-tunable quadruple-$Q$ states driven by momentum-space frustration
Simulations of a square-lattice spin model with bilinear and biquadratic interactions reveal successive field-driven transitions to single-Q, double-Q, and multiple inequivalent quadruple-Q states with distinct phase locking, amplitude distributions, and scalar spin chirality.