We present a systematic study of vertex corrections in a homogeneous electron gas at metallic densities. The vertex diagrams are built using a recently proposed positive-definite diagrammatic expansion for the spectral function. The vertex function not only provides corrections to the well known plasmon and particle-hole scatterings, but also gives rise to new physical processes such as the generation of two plasmon excitations or the decay of the one-particle state into a two-particle-one-hole state. By an efficient Monte Carlo momentum integration we are able to show that the additional scattering channels are responsible for a reduction of the bandwidth, the appearance of a secondary plasmon satellite below the Fermi level, and a substantial redistribution of spectral weights. The feasibility of the approach for first-principles band-structure calculations is also discussed.

Pavlyukh, Y., Uimonen, A., STEFANUCCI, G., & Van Leeuwen, R. (2016). Vertex corrections for positive-definite spectral functions of simple metals. PHYSICAL REVIEW LETTERS, 117(20) [10.1103/PhysRevLett.117.206402].

Vertex corrections for positive-definite spectral functions of simple metals

STEFANUCCI, GIANLUCA;
2016

Abstract

We present a systematic study of vertex corrections in a homogeneous electron gas at metallic densities. The vertex diagrams are built using a recently proposed positive-definite diagrammatic expansion for the spectral function. The vertex function not only provides corrections to the well known plasmon and particle-hole scatterings, but also gives rise to new physical processes such as the generation of two plasmon excitations or the decay of the one-particle state into a two-particle-one-hole state. By an efficient Monte Carlo momentum integration we are able to show that the additional scattering channels are responsible for a reduction of the bandwidth, the appearance of a secondary plasmon satellite below the Fermi level, and a substantial redistribution of spectral weights. The feasibility of the approach for first-principles band-structure calculations is also discussed.
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Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/03 - Fisica della Materia
English
Physics and Astronomy (all)
http://harvest.aps.org/bagit/articles/10.1103/PhysRevLett.117.206402/apsxml
Pavlyukh, Y., Uimonen, A., STEFANUCCI, G., & Van Leeuwen, R. (2016). Vertex corrections for positive-definite spectral functions of simple metals. PHYSICAL REVIEW LETTERS, 117(20) [10.1103/PhysRevLett.117.206402].
Pavlyukh, Y; Uimonen, A; Stefanucci, G; Van Leeuwen, R
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/174017
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