We examine the property of the fluctuation which exists around the mean field of the spin density wave state in low dimensional conductors. The collective modes are calculated for the spin density fluctuation, the charge density fluctuation and the superconducting fluctuation. The effective Hamiltonian describing these modes are derived microscopically from the path integral method and from the perturbational method. The effect of the nonmagnetic impurity is also discussed.
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Yoshikazu Suzumura (1990) studied this question.
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