Open AccessPhase diagram of the one-dimensional extended ionic Hubbard model
Author(s) -
Hongduo Zhao,
Hui Zhao,
Yuguang Chen,
Yiming Yan
Publication year - 2015
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.64.107101
Subject(s) - phase diagram , hubbard model , ionic bonding , condensed matter physics , physics , scaling , renormalization group , density matrix renormalization group , electron , phase (matter) , ion , quantum mechanics , superconductivity , mathematics , geometry
We use a density-matrix renormalization group method to study quantitatively the phase diagram of the half-filled one-dimensional (1D) extended Hubbard model in the presence of a staggered ionic potential Δ. An extensive finite-size scaling analysis is carried out on the relevant structure factors and localization operator to characterize the Mott-insulator (MI)-bond-ordered insulator (BOI)-band-insulator (BI) transitions. The intermediate BOI phase occupies a small region of the phase diagram, and this region is enlarged in the presence of Δ. In addition, the phase diagram of ionic Hubbard (the nearest-neighbor electron-electron interaction V=0) is also given.