Theory of spin-reflection positivity developed in recent years is reviewed. This theory makes
use of symmetries in an electron system and theory of matrix to investigate the ground state …

We construct a class of exact ground states for correlated electrons on pentagon chains in
the high density region and discuss their physical properties. In this procedure the …

We have studied the extended Hubbard model with pair hop** in the atomic limit for
arbitrary electron density and chemical potential. The Hamiltonian considered consists of (i) …

We have studied the extended Hubbard model with pair hop** in the atomic limit for
arbitrary electron density and chemical potential and focus on paramagnetic effects of the …

Exotic superconducting states in the extended attractive Hubbard model - IOPscience Skip to
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We construct exact ground states of interacting electrons on triangle and diamond Hubbard
chains. The construction requires (i) a rewriting of the Hamiltonian into positive semidefinite …

We investigate in the Hartree approximation the temperature and filling dependence of the
superconducting π phase for the Penson-Kolb-Hubbard model. Due to the presence of the …

In the paper, we study the thermodynamic and electromagnetic properties of the Penson–
Kolb (PK) model, ie, the tight-binding model for fermionic particles with the pair-hop** …

The experimental realization of time-dependent ultracold lattice systems has paved the way
towards the implementation of new Hubbard-like Hamiltonians. We show that in a one …

We investigate integrable fermionic models within the scheme of the graded quantum
inverse scattering method, and prove that any symmetry imposed on the solution of the Yang …