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- W2078755166 abstract "We study the effects of doping on the spin fluctuations of the two-dimensional Hubbard model. Within a harmonic approximation we calculate the linearized antiferromagnetic spin-wave spectra around a hole away from half-filling, which takes the form of a spin polaron in a mean-field approximation. The presence of the spin polaron breaks a symmetry of the problem, the product of time reversal and lattice translation. As a result, the double degeneracy of the magnon spectra of the N'eel state is lifted. There also appear localized magnon modes depending on the ratio U/t of the Hubbard model. The quantum correction due to the spin fluctuations is found to increase the spin polaron binding energy for U/t13, but decreases it for U/t>13." @default.
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- W2078755166 date "1991-08-01" @default.
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- W2078755166 title "Linearized antiferromagnetic spin-wave spectra around a hole in the two-dimensional Hubbard model" @default.
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- W2078755166 doi "https://doi.org/10.1103/physrevb.44.2609" @default.
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