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

Fabio Caruso () and Feliciano Giustino
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Fabio Caruso: University of Oxford
Feliciano Giustino: University of Oxford

The European Physical Journal B: Condensed Matter and Complex Systems, 2016, vol. 89, issue 11, 1-7

Abstract: 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.

Date: 2016
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DOI: 10.1140/epjb/e2016-70028-4

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