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Title: Enhancement of charge density wave correlations in a Holstein model with an anharmonic phonon potential

Abstract

The Holstein Hamiltonian describes itinerant electrons whose site density couples to local phonon degrees of freedom. In the single-site limit, at half filling, the electron-phonon coupling results in a double-well structure for the lattice displacement, favoring empty or doubly occupied sites. In two dimensions and on a bipartite lattice in d ≥ 2, intersite hopping causes these doubly occupied and empty sites to alternate in a charge density wave (CDW) pattern when the temperature is lowered. Because a discrete symmetry is broken, this occurs in a conventional second-order transition at finite Tcdw. In this paper, we investigate the effect of changing the phonon potential energy to one with an intrinsic double-well structure even in the absence of electron-phonon coupling. While this aids in the initial process of pair formation, the implications for subsequent CDW order are nontrivial. One expects that, when the electron-phonon coupling is too strong, the double wells become deep and the polaron mass gets large, an effect which reduces Tcdw. Here, we show here the existence of regions of parameter space where the double-well potential, while aiding local pair formation, does so in a way which also substantially enhances long-range CDW order.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [5]
  1. Kalamazoo College, MI (United States); University of California, Davis, CA (United States)
  2. Flatiron Institute, New York, NY (United States); University of California, Davis, CA (United States)
  3. Université Côte d'Azur, Nice (France)
  4. National University of Singapore (Singapore); Université Côte d'Azur, Nice (France)
  5. University of California, Davis, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Davis, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
2007046
Grant/Contract Number:  
SC0014671; PHY2150515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B
Additional Journal Information:
Journal Volume: 108; 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; Charge density waves; Phase transitions; Transition temperature; Holstein model; Quantum Monte Carlo

Citation Formats

Kvande, Claire, Feng, C., Hébert, F., Batrouni, G. G., and Scalettar, R. T. Enhancement of charge density wave correlations in a Holstein model with an anharmonic phonon potential. United States: N. p., 2023. Web. doi:10.1103/physrevb.108.075119.
Kvande, Claire, Feng, C., Hébert, F., Batrouni, G. G., & Scalettar, R. T. Enhancement of charge density wave correlations in a Holstein model with an anharmonic phonon potential. United States. https://doi.org/10.1103/physrevb.108.075119
Kvande, Claire, Feng, C., Hébert, F., Batrouni, G. G., and Scalettar, R. T. Mon . "Enhancement of charge density wave correlations in a Holstein model with an anharmonic phonon potential". United States. https://doi.org/10.1103/physrevb.108.075119.
@article{osti_2007046,
title = {Enhancement of charge density wave correlations in a Holstein model with an anharmonic phonon potential},
author = {Kvande, Claire and Feng, C. and Hébert, F. and Batrouni, G. G. and Scalettar, R. T.},
abstractNote = {The Holstein Hamiltonian describes itinerant electrons whose site density couples to local phonon degrees of freedom. In the single-site limit, at half filling, the electron-phonon coupling results in a double-well structure for the lattice displacement, favoring empty or doubly occupied sites. In two dimensions and on a bipartite lattice in d ≥ 2, intersite hopping causes these doubly occupied and empty sites to alternate in a charge density wave (CDW) pattern when the temperature is lowered. Because a discrete symmetry is broken, this occurs in a conventional second-order transition at finite Tcdw. In this paper, we investigate the effect of changing the phonon potential energy to one with an intrinsic double-well structure even in the absence of electron-phonon coupling. While this aids in the initial process of pair formation, the implications for subsequent CDW order are nontrivial. One expects that, when the electron-phonon coupling is too strong, the double wells become deep and the polaron mass gets large, an effect which reduces Tcdw. Here, we show here the existence of regions of parameter space where the double-well potential, while aiding local pair formation, does so in a way which also substantially enhances long-range CDW order.},
doi = {10.1103/physrevb.108.075119},
journal = {Physical Review. B},
number = 7,
volume = 108,
place = {United States},
year = {Mon Aug 07 00:00:00 EDT 2023},
month = {Mon Aug 07 00:00:00 EDT 2023}
}

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