Fixed Point of the Spin-Fermion Model Doped with a Single Fermion

Nobuo Furukawa, Masatoshi Imada

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Abstract

Spin-fermion model on a square lattice is investigated in the perturbation expansion in terms of the spin-fermion Kondo coupling. The fermion self-energy is calculated in a selfconsistent treatment by a dominant pole approximation. The quasi-particle excitation of a doped fermion turns out to be totally incoherent. It suggests that the low energy excitations should be described by the bound state of a fermion and spins as a collective mode and imply that the fixed point of the spin-fermion model with a single fermion is the t-J model. It also suggests the spin-charge separation of the low energy excitations in the light doping region of these two models.

Original languageEnglish
Pages (from-to)2048-2055
Number of pages8
Journaljournal of the physical society of japan
Volume61
Issue number6
DOIs
Publication statusPublished - 1992 Jun

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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