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Abstract
A consistent Schwinger-boson mean field theory is developed for a spin-1/2 2D antiferromagnet. It predicts that there are two branches of the Schwinger-boson excitation spectrum: an acoustic branch, essentially the same as that predicted by Arovas and Auerbach theory, and a new optical branch. The present theory provides a natural explanation of the mystery of the Raman “two magon” scattering from La2CuO4.
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