Hybridization in Hubbard models with different bandwidths
نویسندگان
چکیده
منابع مشابه
on some bayesian statistical models in actuarial science with emphasis on claim count
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15 صفحه اولAnalyticity in Hubbard Models
Abstract. The Hubbard model describes a lattice system of quantum particles with local (on-site) interactions. Its free energy is analytic when βt is small, or βt/U is small; here, β is the inverse temperature, U the on-site repulsion and t the hopping coefficient. For more general models with Hamiltonian H = V +T where V involves local terms only, the free energy is analytic when β‖T ‖ is smal...
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We propose a general framework that leads to one-dimensional XX and Hubbard models in full generality, based on the decomposition of an arbitrary vector space (possibly infinite dimensional) into a direct sum of two subspaces, the two corresponding orthogonal projectors allowing one to define a R-matrix of a universal XX model, and then of a Hubbard model using a Shastry type construction. The ...
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where a†iσ , aiσ are fermionic operators for electrons of spin σ ∈ {↑, ↓} at site i of the lattice, niσ ≡ a † iσaiσ, and 〈i, j〉 denotes nearest neighbor sites i 6= j. The model is given in grand canonical form; μ fixes the average number 〈 ∑ i,σ niσ〉 of electrons. The first term is a local on-site interaction; for u > 0 it describes a repulsive Coulomb interaction, for u < 0 it yields an effect...
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ژورنال
عنوان ژورنال: Journal of Physics: Condensed Matter
سال: 2007
ISSN: 0953-8984,1361-648X
DOI: 10.1088/0953-8984/19/43/436206