Ensemble Green's function theory for interacting electrons with degenerate ground states
(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.
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https://lup.lub.lu.se/record/8e55e359-5bf8-4dce-8c29-c5fe32120d77
- author
- Linnér, E. and Aryasetiawan, F. LU
- organization
- publishing date
- 2019
- 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}}, }