Magnetism and infrared divergence in a Hubbard-phonon interacting system

作者: Yoshitsugu Sekine

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摘要: We show that a finite Hubbard-phonon interacting system has ferromagnetic or unique spin-singlet ground state under the infrared singular condition. The key tool is unitary transformation introduced by Arai and Hirokawa. construct concrete representation using operator algebraic method. method essentially same as one for van Hove model Wightman functional

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