نتایج جستجو برای: hubbard approximation
تعداد نتایج: 204802 فیلتر نتایج به سال:
We study the two-band degenerate Hubbard model using the fluctuation exchange approximation (FLEX) and compare the results with quantum Monte Carlo (QMC) calculations. Both the self-consistent and the non-self-consistent versions of the FLEX scheme are investigated. We find that, unlike in the one-band case, in the multiband case, good agreement with the quantum Monte Carlo results is obtained ...
We develop a time-dependent Gutzwiller approximation (GA) for the Hubbard model analogous to the time-dependent Hartree-Fock (HF) method. This new formalism incorporates ground state correlations of the random phase approximation (RPA) type beyond the GA. Static quantities like ground state energy and double occupancy are in excellent agreement with exact results in one dimension up to moderate...
The relevance of the Hubbard model as minimal model for describing the highTc cuprate superconductors 4 and, generally, many strongly correlated materials is very well established. The model is thought to have a very rich phenomenology: a variety of spin and charge orderings (ferroand antiferromagnetic included), Mott transitions (of the Slater, Heisenberg and Hubbard types) driven by both fill...
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