منابع مشابه
One-dimensional Kondo lattice model at quarter filling
We revisit the problem of the quarter-filled one-dimensional Kondo lattice model, for which the existence of a dimerized phase and a nonzero charge gap had been reported by Xavier et al. Phys. Rev. Lett. 90, 247204 2003 . Recently, some objections were raised claiming that the system is neither dimerized nor has a charge gap. In the interest of clarifying this important issue, we show that thes...
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We propose a quantitative estimate of the charge gap that opens in the onedimensional dimerized Hubbard model at quarter-filling due to dimerization, which makes the system effectively half–filled, and to repulsion, which induces umklapp scattering processes. Our estimate is expected to be valid for any value of the repulsion and of the parameter describing the dimerization. It is based on anal...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2007
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.75.224405