Bosonization Approach to the One-Dimensional Kondo Lattice Model at Half Filling: Reexamination

Details Bosonization Approach to the One-Dimensional Kondo Lattice Model at Half Filling: Reexamination Bosonization Approach to the One-Dimensional Kondo Lattice Model at Half Filling: Reexamination

1997-02-26

arxiv.org/abs/cond-mat/9702222v1

Physics

Condensed Matter

Strongly Correlated Electrons

JPSJ-style files are included

Scientific paper

10.1143/JPSJ.66.2157

Low-energy properties of the one-dimensional Kondo lattice model are investigated by using bosonization and renormalization group methods. The formation of the spin and charge excitation gaps at half-filling is discussed in detail both for antiferromagnetic and ferromagnetic Kondo couplings. Also, the effect of the interaction between conduction electrons on the gap formation is studied both for the Kondo insulating phase and for the Haldane gap phase. It is found that while the repulsive interaction changes the dependence of the excitation gap on the Kondo exchange coupling, the attractive interaction can drive the Kondo (or Haldane) insulating phase to a completely different phase of massless metallic states.

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