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• W2042268081 abstract "The spectrum of short-wavelength magnons in two-dimensional quantum Heisenberg antiferromagnet on a square lattice is calculated in the third order in $1/S$ expansion. It is shown that $1/S$ series for $S=1/2$ converges fast in the whole Brillouin zone except for the neighborhood of the point ${bf k}=(pi,0)$, at which absolute values of the third and the second order $1/S$-corrections are approximately equal to each other. It is shown that the third order corrections make deeper the roton-like local minimum at ${bf k}=(pi,0)$ improving the agreement with the recent experiments and numerical results in the neighborhood of this point. It is suggested that $1/S$ series converges slowly near ${bf k}=(pi,0)$ also for $S=1$ although the spectrum renormalization would be small in this case due to very small values of high-order $1/S$ corrections." @default.
• W2042268081 created "2016-06-24" @default.
• W2042268081 creator A5047780462 @default.
• W2042268081 date "2010-04-30" @default.
• W2042268081 modified "2023-10-16" @default.
• W2042268081 title "Spectrum of short-wavelength magnons in a two-dimensional quantum Heisenberg antiferromagnet on a square lattice: third-order expansion in 1/<i>S</i>" @default.
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• W2042268081 doi "https://doi.org/10.1088/0953-8984/22/21/216003" @default.
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