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The GW plus cumulant method and plasmonic polarons: application to the homogeneous electron gas

Author

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  • Fabio Caruso

    (University of Oxford)

  • Feliciano Giustino

    (University of Oxford)

Abstract

We study the spectral function of the homogeneous electron gas using many-body perturbation theory and the cumulant expansion. We compute the angle-resolved spectral function based on the GW approximation and the “GW plus cumulant” approach. In agreement with previous studies, the GW spectral function exhibits a spurious plasmaron peak at energies 1.5ω pl below the quasiparticle peak, ω pl being the plasma energy. The GW plus cumulant approach, on the other hand, reduces significantly the intensity of the plasmon-induced spectral features and renormalizes their energy relative to the quasiparticle energy to ω pl. Consistently with previous work on semiconductors, our results show that the HEG is characterized by the emergence of plasmonic polaron bands, that is, broadened replica of the quasiparticle bands, red-shifted by the plasmon energy.

Suggested Citation

  • Fabio Caruso & Feliciano Giustino, 2016. "The GW plus cumulant method and plasmonic polarons: application to the homogeneous electron gas," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 89(11), pages 1-7, November.
    • Handle: RePEc:spr:eurphb:v:89:y:2016:i:11:d:10.1140_epjb_e2016-70028-4
    DOI: 10.1140/epjb/e2016-70028-4
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