Phase diagram of the one-dimensional extended ionic Hubbard model | Zendy

Zhao Hong-Xia | Zendy; Hui Zhao | Zendy; Yuguang Chen | Zendy; Yan Yong-Hong | Zendy

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Phase diagram of the one-dimensional extended ionic Hubbard model

Author(s) -

Zhao Hong-Xia,

Hui Zhao,

Yuguang Chen,

Yan Yong-Hong

Publication year - 2015

Publication title -

acta physica sinica

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.

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