Optical conductivity of one-dimensional doped Hubbard-Mott insulator
نویسندگان
چکیده
منابع مشابه
Optical conductivity in Mott-Hubbard systems.
We study the transfer of spectral weight in the optical spectra of a strongly correlated electron system as a function of temperature and interaction strength. Within a dynamical mean field theory of the Hubbard model that becomes exact in the limit of large lattice coordination, we predict an anomalous enhancement of spectral weight as a function of temperature in the correlated metallic state...
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ions and approximations can violate the f -sum rules; then, the plasma frequency may become dependent on parameters of the model or even on temperature. Before we treat transport properties and the conductivity sum rule on a microscopic level in the next sections, we want to discuss the qualitative impact of the neglect of lattice degrees of freedom and of a reduction to a few valence bands. Fu...
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The one-dimensional Bose-Hubbard model at a unit filling factor is studied by means of a very high-order symbolic perturbative expansion. Analytical expressions are derived for the ground-state quantities such as energy per site, variance of on-site occupation, and correlation functions: âj âj+r and n̂jn̂j+r . These findings are compared to numerics and good agreement is found in the Mott insulat...
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We introduce the concept that there are two generic classes of Mott insu-lators in nature. They are distinguished by their responses to weak doping. Doped charges form cluster (i.e. distribute inhomogeneously) in type I Mott insulators while distribute homogeneously in type II Mott insulators. We present our opinion on the role inhomogeneity plays in the cuprates.
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We calculate the one-particle density of states for the Mott–Hubbard insulating phase of the Hubbard model on a Bethe lattice in the limit of infinite coordination number. We employ the Kato–Takahashi perturbation theory around the strong-coupling limit to derive the Green function. We show that the Green function for the lower Hubbard band can be expressed in terms of polynomials in the bare h...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2002
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.66.073105