Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-04-28
Phys. Rev. B 56, 11084-11091 (1997)
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 7 Postscript figures, REVTeX
Scientific paper
10.1103/PhysRevB.56.11084
The one-dimensional Kondo lattice model with attractive interaction among the conduction electrons is analyzed in the case of half-filling. It is shown that there are three distinct phases depending on the coupling constants of the model. Two phases have a spin and charge gap. While one shows a clear separation of the spin and charge excitation spectrum the other phase may be characterized as a band insulator type where both excitations are due to two-particle states. The third phase is gapless in both channels and has quasi long-range order in the spin and charge density wave correlation. In this phase the spin and charge excitations have again a clearly separated spectrum. For the analysis we discuss first two limiting cases. Then a density matrix renormalization group calculation on finite systems is applied to determine the phase diagram and the correlation functions in the gapped and gapless phase for general couplding constants.
Heeb E.
Shibata Naokazu
Sigrist Manfred
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