Abstract
We proposed a modified Schwinger boson theory for quantum Heisenberg model which naturally satisfies the spin identity [Formula: see text], and in which the redundant degrees of freedom due to an average treatment of the constraints are discarded by introducing new boson operators. The results, either for free energy or for spin-spin correlation are exactly the same as those of Takahashi’s modified spin wave theory.7 This theory provides a unified approach to study the ferromagnet and antiferromagnet on equal footing. As such it would be a good starting point for discussing antiferromagnetism in the presence of holes, where ferromagnetic component plays an important role.
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