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Title: One-dimensional Hubbard-Holstein model with finite-range electron-phonon coupling

Abstract

The Hubbard-Holstein model describes fermions on a discrete lattice, with on-site repulsion between fermions and a coupling to phonons that are localized on sites. Generally, at half-filling, increasing the coupling g to the phonons drives the system towards a Peierls charge density wave state, whereas increasing the electron-electron interaction U drives the fermions into a Mott antiferromagnet. At low g and U, or when doped, the system is metallic. In one dimension, using quantum Monte Carlo simulations, we study the case where fermions have a long-range coupling to phonons, with characteristic range ξ, interpolating between the Holstein and Fröhlich limits. Without electron-electron interaction, the fermions adopt a Peierls state when the coupling to the phonons is strong enough. This state is destabilized by a small coupling range ξ and leads to a collapse of the fermions, and, consequently, phase separation. Increasing interaction U will drive any of these three phases (metallic, Peierls, phase separation) into a Mott insulator phase. Furthermore, the phase separation region is once again present in the U ≠ 0 case, even for small values of the coupling range.

Authors:
 [1];  [2];  [3];  [2];  [4]
  1. Univ. Côte d'Azur (France)
  2. Univ. of California, Davis, CA (United States)
  3. Loyola Univ. New Orleans, LA (United States)
  4. Univ. Côte d'Azur (France); CNRS-UNS-NUS-NTU International Joint Research Unit (Singapore); National Univ. of Singapore (Singapore); Beijing Computational Science Research Center (China)
Publication Date:
Research Org.:
Univ. of California, Davis, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1612258
Alternate Identifier(s):
OSTI ID: 1493648
Grant/Contract Number:  
SC0014671
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 7; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; Physics; Electron-phonon coupling; Holstein model; Hubbard model; Quantum Monte Carlo

Citation Formats

Hébert, Frederic, Xiao, Bo, Rousseau, V. G., Scalettar, R. T., and Batrouni, G. G. One-dimensional Hubbard-Holstein model with finite-range electron-phonon coupling. United States: N. p., 2019. Web. doi:10.1103/physrevb.99.075108.
Hébert, Frederic, Xiao, Bo, Rousseau, V. G., Scalettar, R. T., & Batrouni, G. G. One-dimensional Hubbard-Holstein model with finite-range electron-phonon coupling. United States. https://doi.org/10.1103/physrevb.99.075108
Hébert, Frederic, Xiao, Bo, Rousseau, V. G., Scalettar, R. T., and Batrouni, G. G. Wed . "One-dimensional Hubbard-Holstein model with finite-range electron-phonon coupling". United States. https://doi.org/10.1103/physrevb.99.075108. https://www.osti.gov/servlets/purl/1612258.
@article{osti_1612258,
title = {One-dimensional Hubbard-Holstein model with finite-range electron-phonon coupling},
author = {Hébert, Frederic and Xiao, Bo and Rousseau, V. G. and Scalettar, R. T. and Batrouni, G. G.},
abstractNote = {The Hubbard-Holstein model describes fermions on a discrete lattice, with on-site repulsion between fermions and a coupling to phonons that are localized on sites. Generally, at half-filling, increasing the coupling g to the phonons drives the system towards a Peierls charge density wave state, whereas increasing the electron-electron interaction U drives the fermions into a Mott antiferromagnet. At low g and U, or when doped, the system is metallic. In one dimension, using quantum Monte Carlo simulations, we study the case where fermions have a long-range coupling to phonons, with characteristic range ξ, interpolating between the Holstein and Fröhlich limits. Without electron-electron interaction, the fermions adopt a Peierls state when the coupling to the phonons is strong enough. This state is destabilized by a small coupling range ξ and leads to a collapse of the fermions, and, consequently, phase separation. Increasing interaction U will drive any of these three phases (metallic, Peierls, phase separation) into a Mott insulator phase. Furthermore, the phase separation region is once again present in the U ≠ 0 case, even for small values of the coupling range.},
doi = {10.1103/physrevb.99.075108},
journal = {Physical Review B},
number = 7,
volume = 99,
place = {United States},
year = {Wed Feb 06 00:00:00 EST 2019},
month = {Wed Feb 06 00:00:00 EST 2019}
}

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