An investigation of the 2D attractive Hubbard model
نویسندگان
چکیده
منابع مشابه
Nonperturbative approach to the attractive Hubbard model
A nonperturbative approach to the single-band attractive Hubbard model is presented in the general context of functional-derivative approaches to many-body theories. As in previous work on the repulsive model, the first step is based on a local-field-type ansatz, on enforcement of the Pauli principle and a number of crucial sumrules. The Mermin-Wagner theorem in two dimensions is automatically ...
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متن کاملPseudogaps in the 2D Hubbard Model.
We study the pseudogaps in the spectra of the 2D Hubbard model using both finite-size and dynamical cluster approximation (DCA) quantum Monte Carlo calculations. At half-filling, a charge pseudogap, accompanied by non-Fermi-liquid behavior in the self-energy, is shown to persist in the thermodynamic limit. The DCA (finite-size) method systematically underestimates (overestimates) the width of t...
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ژورنال
عنوان ژورنال: The European Physical Journal B
سال: 1998
ISSN: 1434-6028
DOI: 10.1007/s100510050275