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Plasmons in Strongly Correlated Systems: Spectral Weight Transfer and Renormalized Dispersion

Plasmons in Strongly Correlated Systems: Spectral Weight Transfer and Renormalized Dispersion We study the charge-density dynamics within the two-dimensional extended Hubbard model in the presence of long-range Coulomb interaction across the metal-insulator transition point. To take into account strong correlations we start from self-consistent extended dynamical mean-field theory and include nonlocal dynamical vertex corrections through a ladder approximation to the polarization operator. This is necessary to fulfill charge conservation and to describe plasmons in the correlated state. The calculated plasmon spectra are qualitatively different from those in the random-phase approximation: they exhibit a spectral density transfer and a renormalized dispersion with enhanced deviation from the canonical q behavior. Both features are reminiscent of interaction induced changes found in single-electron spectra of strongly correlated systems. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

Plasmons in Strongly Correlated Systems: Spectral Weight Transfer and Renormalized Dispersion

Plasmons in Strongly Correlated Systems: Spectral Weight Transfer and Renormalized Dispersion

Physical Review Letters , Volume 113 (24): 5 – Dec 11, 2014

Abstract

We study the charge-density dynamics within the two-dimensional extended Hubbard model in the presence of long-range Coulomb interaction across the metal-insulator transition point. To take into account strong correlations we start from self-consistent extended dynamical mean-field theory and include nonlocal dynamical vertex corrections through a ladder approximation to the polarization operator. This is necessary to fulfill charge conservation and to describe plasmons in the correlated state. The calculated plasmon spectra are qualitatively different from those in the random-phase approximation: they exhibit a spectral density transfer and a renormalized dispersion with enhanced deviation from the canonical q behavior. Both features are reminiscent of interaction induced changes found in single-electron spectra of strongly correlated systems.

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References (32)

Publisher
American Physical Society (APS)
Copyright
© 2014 American Physical Society
Subject
LETTERS; Condensed Matter: Electronic Properties, etc.
ISSN
0031-9007
eISSN
1079-7114
DOI
10.1103/PhysRevLett.113.246407
pmid
25541788
Publisher site
See Article on Publisher Site

Abstract

We study the charge-density dynamics within the two-dimensional extended Hubbard model in the presence of long-range Coulomb interaction across the metal-insulator transition point. To take into account strong correlations we start from self-consistent extended dynamical mean-field theory and include nonlocal dynamical vertex corrections through a ladder approximation to the polarization operator. This is necessary to fulfill charge conservation and to describe plasmons in the correlated state. The calculated plasmon spectra are qualitatively different from those in the random-phase approximation: they exhibit a spectral density transfer and a renormalized dispersion with enhanced deviation from the canonical q behavior. Both features are reminiscent of interaction induced changes found in single-electron spectra of strongly correlated systems.

Journal

Physical Review LettersAmerican Physical Society (APS)

Published: Dec 11, 2014

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