Auxiliary-Particle Theory of Strongly Correlated Systems
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概要
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The Hubbard model with strong correlation is investigated in an auxiliary boson-fermion Hamiltonian, where electrons are described by fermionic pair-excitations ofauxiliary particles. Auxiliary particles are localized because of a local gauge symmetry, which is required to guarantee the equivalence between the Hubbard modeland the auxiliary-particle Hamiltonian. The density of states of electrons has adouble-peak structure in nearly-half filled cases. The main band is broad and deep,and it is consistent with the alloy analogy of the Hubbard model. The other is narrowand at the top of the main band, where the chemical potential lies. The narrow peakcan be interpreted in terms of the formation of heavy quasiparticles or heavy elecirons. The mass enhancement factor of heavy electrons is consistent with the Gutzwiller variational treatment of the Hubbard model.
- 社団法人日本物理学会の論文
- 1989-11-15
著者
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Fusayoshi J.
Department Of Physics Hokkaido University
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Ohkawa Fusayoshi
Department Of Physics Faculty Of Science University Of Tokyo
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