Charge ordering and nonlocal correlations in the doped extended Hubbard model

Hanna Terletska, Tianran Chen, Joseph Paki, and Emanuel Gull
Phys. Rev. B 97, 115117 – Published 9 March 2018

Abstract

We study the extended Hubbard model away from half filling on a two-dimensional square lattice using cluster dynamical mean field theory on clusters of size 8. We show that the model exhibits metallic, compressible charge-ordered, and insulating charge-ordered phases. We determine the location of the charge-ordering phase transition line at finite temperature and the properties of the phases as a function of doping, temperature, local interaction, and nearest-neighbor interaction. An analysis of the energetics of the charge-order transition shows that the charge-ordering transition mainly results in a rearrangement of local and nonlocal potential energy. We show the doping evolution of the spectral function from the isotropic metal via a charge-ordered metal to a charge-ordered insulator with a big gap, and study finite-size effects of the approximation.

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  • Received 10 January 2018
  • Revised 19 February 2018

DOI:https://doi.org/10.1103/PhysRevB.97.115117

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Hanna Terletska1,2, Tianran Chen3, Joseph Paki2, and Emanuel Gull2

  • 1Department of Physics and Astronomy, Computational Science Program, Middle Tennessee State University, Murfreesboro, Tennessee 37132, USA
  • 2Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
  • 3Department of Physics, West Chester University of Pennsylvania, West Chester, Pennsylvania 19383, USA

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Issue

Vol. 97, Iss. 11 — 15 March 2018

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