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• W2035596945 abstract "We study the effects of quantum fluctuations on excitation spectra in the two-dimensional Heisenberg antiferromagnet by means of the $1∕S$ expansion. We calculate the spin-wave dispersion and the transverse dynamical structure factor up to the second order of $1∕S$ in comparison with inelastic neutron scattering experiments. The spin-wave energy at momentum $(ensuremath{pi},0)$ is found to be about 2% smaller than that at $(ensuremath{pi}∕2,ensuremath{pi}∕2)$ due to the second-order correction. In addition, we study the dimensional crossover from two dimensions to one dimension by weakening exchange couplings in one direction. It is found that the second-order correction becomes large with approaching the quasi-one-dimensional situation and makes the spin-wave energy approach to the des Cloizeaux-Pearson boundary for $S=1∕2$. The transverse dynamical structure factor is also calculated up to the second order of $1∕S$. It is shown that the intensity of the spin-wave peak is strongly reduced while the intensity of three-spin-wave continuum becomes large and exceeds that of the spin-wave peak in the quasi-one-dimensional situation." @default.
• W2035596945 created "2016-06-24" @default.
• W2035596945 creator A5064582120 @default.
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• W2035596945 date "2005-07-01" @default.
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• W2035596945 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mn>1</mml:mn><mml:mo>∕</mml:mo><mml:mi>S</mml:mi></mml:mrow></mml:math>-expansion study of spin waves in a two-dimensional Heisenberg antiferromagnet" @default.
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• W2035596945 doi "https://doi.org/10.1103/physrevb.72.014403" @default.
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