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We present large-scale numerical exact diagonalization results of static and dynamical properties of the square lattice Heisenberg antiferromagnet in a uniform magnetic field. We provide strong numerical evidence for the decay of antiferromagnetic magnons in high magnetic field, in agreement with previous work based on spin-wave theory. Furthermore we report strong renormalization effects of the spin-wave dispersion in low and intermediate fields,
reminiscent of similar effects in the triangular lattice antiferromagnet.
Work performed in collaboration with A. Luscher |
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