Abstract
Effects of hopping disorder in the Mott-Hubbard antiferromagnet are studied, both perturbatively and also using the exact-eigenstate method, in the strong correlation limit. It is shown that while the low-energy, long-wavelength magnon modes are only weakly affected, the high-energy modes are strongly affected because of a cooperative effect arising from local correlations in hopping disorder. Implications of this highly asymmetric magnon-energy renormalization for two-magnon Raman scattering in cuprate antiferromagnets are also discussed.
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