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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Antiferromagnetic skyrmions exhibit bidirectional motion under current-induced torques above a threshold due to competing effective forces, enabling logic gates.
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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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Bidirectional motion of antiferromagnetic skyrmions driven by competing spin torques
Antiferromagnetic skyrmions exhibit bidirectional motion under current-induced torques above a threshold due to competing effective forces, enabling logic gates.