Journal ArticleDOI
The ground state of the neutral Hubbard model
TLDR
In this article, the ground state energy of the neutral Hubbard model is calculated by BCS methods for all values of total spinSz. Numerical results are given for the simple cubic and for the body centred cubic lattice.Abstract:
The ground state energy of the neutral Hubbard model is calculated by BCS methods for all values of total spinSz. Numerical results are given for the simple cubic and for the body centred cubic lattice. Antiferromagnetic ordering and a finite paramagnetic susceptibility is found for all values of the coupling constantV0.read more
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Generalized Hartree-Fock theory and the Hubbard model
TL;DR: In this paper, the authors generalized the Hartree-Fock variational principle to include quasi-free states, which are in one-to-one correspondence with the one-particle density matrices.
Journal ArticleDOI
Generalized Hartree-Fock Theory and the Hubbard Model
TL;DR: In this article, the authors generalized the Hartree-Fock variational principle to include quasi-free states and showed that these are in one-to-one correspondence with the one-particle density matrices and these, in turn, provide a convenient formulation of the BCS theory as a special case.
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Estimation of Off-Site Coulomb Integrals and Phase Diagrams of Charge Ordered States in the θ-Phase Organic Conductors
TL;DR: In this paper, the authors calculated the bare V of the highest occupied molecular orbitals (HOMO) of BEDT-TTF (bis(ethylenedithio)tetrathiafulvalene) is calculated for various molecular geometries.
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Variational Monte Carlo studies of attractive Hubbard model. I - Normal-state properties
TL;DR: In this paper, a series of variational Monte Carlo calculations with better statistics was carried out to estimate accurately the expectation values of several many-body wave functions, including Gutzwiller wave functions.
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Saddle Point Mean Field Calculation in the Hubbard Model
TL;DR: In this article, the Hubbard model is transformed into a bosonic functional integral, which is treated by a mean field approximation in its modern version as a systematic expansion around a saddle point.