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Charge ordering in the extended Hubbard model in the ionic limit

Adolfo Avella, Francesco Paolo Mancini

Physica B Condensed MatterFeb 15, 20064 citations

Charge ordering in the extended Hubbard model

R. Pietig, Stefan Blawid, R. Bulla

Physica B Condensed MatterJan 1, 19990 citations

Long-Range Charge Order in the Extended Holstein–Hubbard Model

Tadahiro Miyao

arXiv:1601.00765Journal of Statistical PhysicsSep 19, 20162 citations

The staggered charge-order phase of the extended Hubbard model in the atomic limit

Christian Borgs, Janusz Jędrzejewski, Roman Kotecký

We study the phase diagram of the extended Hubbard model in the atomic limit. At zero temperature, the phase diagram decomposes into six regions: three with homogeneous phases (characterized by particle densities , 1 and 2 and staggered charge density ) and three with staggered phases (characterized by the densities , 1 and and staggered densities , 1, and ). Here we use Pirogov - Sinai theory to analyse the details of the phase diagram of this model at low temperatures. In particular, we show that for any sufficiently low non-zero temperature the three staggered regions merge into one staggered region S, without any phase transitions (analytic free energy and staggered order parameter ) within S.We study the phase diagram of the extended Hubbard model in the atomic limit. At zero temperature, the phase diagram decomposes into six regions: three with homogeneous phases (characterized by particle densities , 1 and 2 and staggered charge density ) and three with staggered phases (characterized by the densities , 1 and and staggered densities , 1, and ). Here we use Pirogov - Sinai theory to analyse the details of the phase diagram of this model at low temperatures. In particular, we show that for any sufficiently low non-zero temperature the three staggered regions merge into one staggered region S, without any phase transitions (analytic free energy and staggered order parameter ) within S.

arXiv:cond-mat/9501097Journal of Physics A Mathematical and GeneralFeb 21, 199619 citations

Electron Phase Separations Involving Superconductivity in the Extended Hubbard Models with Pair Hopping Interaction

Konrad Jerzy Kapcia

In this work the extended Hubbard models with pair hopping interaction (at the atomic limit) are investigated within the variational approach, which treats the on-site interaction term exactly and the intersite interactions within the mean-eld approximation (exact in d → +∞).We analyze mutual stability of the superconducting phase and charge or (ferro/antiferro-)magnetic orderings as well as homogeneous mixed phases.Our preliminary results for U = 0 show that the superconducting phase can coexist with the charge or (ferro/antiferro-)magnetic phases only in states with electron phase separation.In this work the extended Hubbard models with pair hopping interaction (at the atomic limit) are investigated within the variational approach, which treats the on-site interaction term exactly and the intersite interactions within the mean-eld approximation (exact in d → +∞).We analyze mutual stability of the superconducting phase and charge or (ferro/antiferro-)magnetic orderings as well as homogeneous mixed phases.Our preliminary results for U = 0 show that the superconducting phase can coexist with the charge or (ferro/antiferro-)magnetic phases only in states with electron phase separation.

Acta Physica Polonica AFeb 1, 201511 citations

Phase diagrams of extended Hubbard models in the atomic limit

Janusz Jędrzejewski

Physica A Statistical Mechanics and its ApplicationsApr 1, 199427 citations

Charge orderings in the atomic limit of the extended Hubbard model

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