Theory of Superconductivity in Strongly Correlated Systems: Auxiliary Boson-Fermion Formulation
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概要
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An effective Harniltonian with auxiliary bosons and auxiliary fermions is proposedto treat the Flubbard Hamiltonian with strong correlation. Auxiliary particlesthemselves can not describe any real excitations. In particular, the Bose condensationof auxiliary bosons never occurs, and auxiliary fermions have no Fermi surfaces. Realexcitations are described by two kinds of pair-excitations of auxiliary particles, suchas fermionic and bosonic pair-excitations. Superconductivity in the effective Hamilto-nian is nothing but the condensation of Cooper pairs between fermionic pair-exci-Cations, which are formed by the superexchange interaction mediated by auxiliaryfermions. The proposed model of superconductivity is consistent with anisotropicsinglet superconductivity previously examined by the present author (Jpn. J. Appl.Phys. 26 (1987) L652.), which is based on the Fermi liquid theory of the HubbardHamiltonian.
- 社団法人日本物理学会の論文
- 1988-11-15
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