HiddenXYstructure of the bond-charge Hubbard model
نویسندگان
چکیده
منابع مشابه
Bond-charge interaction in the extended Hubbard chain.
We study the effects of bond-charge interaction (or correlated hopping) on the properties of the extended (i.e., with both on-site (U) and nearest-neighbor (V ) repulsions) Hubbard model in one dimension at half-filling. Energy gaps and correlation functions are calculated by Lanczos diagonalization on finite systems. We find that, irrespective of the sign of the bond-charge interaction, X, the...
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We obtain the exact solution of a general Hubbard chain with kinetic energy t, bond-charge interaction X and on-site interaction U with the only restriction t = X. At zero temperature and half filling, the model exhibits a Mott transition at U = 4t. In the metallic phase and near half filling, superconducting states are part of the degenerate ground state and are favored for small U if the syst...
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We study a one-dimensional extended Peierls-Hubbard model coupled to intracell and intercell phonons for a half-filled band. The calculations are made using the Hartree-Fock and adiabatic approximations for arbitrary temperature. In addition to static spin, charge, and bond density waves, we predict intermediate phases that lack inversion symmetry, and phase transitions that reduce symmetry on ...
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We have studied the Hubbard model with bond-charge interaction on a triangular lattice for a half-filled band. At the point of particle-hole symmetry the model could be analyzed in detail in two opposite regimes of the parameter space. Using a real space renormalization group we calculate the ground state energy and the local moment over the whole parameter space. The RG results obey the exact ...
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The Hubbard model with an additional bond-charge interaction X is solved exactly in one dimension for the case t = X where t is the hopping amplitude. In this case the number of doubly occupied sites is conserved. In the sector with no double occupations the model reduces to the U = ∞ Hubbard model. In arbitrary dimensions the qualitative form of the phase diagram is obtained. It is shown that ...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2010
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.82.233105