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Ensemble Green's function theory for interacting electrons with degenerate ground states

Linnér, E. and Aryasetiawan, F. LU (2019) In Physical Review B 100(23).
Abstract

An ensemble Green's function formalism, based on the von Neumann density matrix approach, to calculate one-electron excitation spectra of a many-electron system with degenerate ground states is proposed. A set of iterative equations for the ensemble Green's function and self-energy is derived and a simplest approximation corresponding to an ensemble GW approximation is naturally obtained. The derivation is based on the Schwinger functional derivative technique and does not assume any adiabatic connection between a noninteracting and an interacting ground state.

Please use this url to cite or link to this publication:
author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
100
issue
23
article number
235106
publisher
American Physical Society
external identifiers
  • scopus:85076571638
ISSN
2469-9950
DOI
10.1103/PhysRevB.100.235106
language
English
LU publication?
yes
id
8e55e359-5bf8-4dce-8c29-c5fe32120d77
date added to LUP
2020-01-07 08:45:43
date last changed
2022-04-18 20:05:08
@article{8e55e359-5bf8-4dce-8c29-c5fe32120d77,
  abstract     = {{<p>An ensemble Green's function formalism, based on the von Neumann density matrix approach, to calculate one-electron excitation spectra of a many-electron system with degenerate ground states is proposed. A set of iterative equations for the ensemble Green's function and self-energy is derived and a simplest approximation corresponding to an ensemble GW approximation is naturally obtained. The derivation is based on the Schwinger functional derivative technique and does not assume any adiabatic connection between a noninteracting and an interacting ground state.</p>}},
  author       = {{Linnér, E. and Aryasetiawan, F.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  number       = {{23}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Ensemble Green's function theory for interacting electrons with degenerate ground states}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.100.235106}},
  doi          = {{10.1103/PhysRevB.100.235106}},
  volume       = {{100}},
  year         = {{2019}},
}