2008/04/29 by Pavol Farkašovský, Pavol Farkasovsky
Materials Science · Physics and Astronomy · #Ferroelectricity #Magnetic and transport properties of perovskites and related materials #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.77.155130
published as Phys. Rev. B 77, 155130 (2008) · 13 pages, 5 figures
openalex publication_date 2008/04/29 · arxiv created 2008/05/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The Hartree-Fock (HF) approximation with the charge-density-wave (CDW) instability is used to study the ground-state phase diagram of the spinless Falicov-Kimball model (FKM) extended by f\text\ensuremath-f hopping in two and three dimensions. It is shown that the HF solutions with the CDW instability perfectly reproduce the two-dimensional intermediate-coupling phase diagram of the FKM model with f\text\ensuremath-f hopping, which was recently calculated using the constrained path Monte Carlo (CPMC) method. Using this fact, we have extended our HF study on cases that have been not described by CPMC, namely, (i) the case of small values of f-electron hopping integrals, (ii) the case of weak Coulomb interactions, and (iii) the three-dimensional case. We have found that ferroelectricity remains robust with respect to the reducing strength of coupling (f-electron hopping) as well as with respect to the increasing dimension of the system.