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Spin and charge fluctuations in a one-dimensional lattice with long-range interactions

Talebi, A. H ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.physb.2019.07.020
  3. Publisher: Elsevier B.V , 2019
  4. Abstract:
  5. We study the competition between spin and charge fluctuations of the extended Hubbard model with on-site and dipole-dipole interactions in a one-dimensional lattice. Using the extended two-particle self consistent (ETPSC) method, we find the corresponding expressions for spin and charge response functions. In this approach, the irreducible spin and charge vertices are a function of inter-particle distance (r) and wave-number (q). This theory allows us to determine the crossover temperatures and the dominant instability as a function of U and V. The phase diagrams are obtained for several effective particle densities: n = 0.5, n = 1 and n = 4/3. Each phase diagram (U − V − T space) incorporates four possible modulations of charge carriers and spins like charge/spin density wave, phase-separation and paramagnetic orders. We find that the portion of possible phases depending on the on-site interaction U, nearest-neighbor interaction V and filling factor n can change. © 2019 Elsevier B.V
  6. Keywords:
  7. Dipole-dipole interactions ; ETPSC method ; Spin and charge response functions ; Dipole moment ; Electric dipole moments ; Phase diagrams ; Phase separation ; Dipole dipole interactions ; Interparticle distances ; Long range interactions ; Nearest-neighbor interactions ; One-dimensional lattice ; Response functions ; Spin and charge fluctuations ; Spin fluctuations
  8. Source: Physica B: Condensed Matter ; Volume 571 , 2019 , Pages 204-209 ; 09214526 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0921452619304594?dgcid=rss_sd_all