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Flat-band physics in the spin-1/2 sawtooth chain
Abstract We consider the strongly anisotropic spin-1/2 XXZ model on the sawtooth-chain lattice with ferromagnetic longitudinal interaction J zz = Δ J and aniferromagnetic transversal interaction J xx = J yy = J > 0. At Δ = −1∕2 the lowest one-magnon excitation band is dispersionless (flat) leading to a …