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

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 1.5ωpl below the quasiparticle peak, ωpl being the plasma energy. The GW plus cumulant approach, on the other hand, reduces significantly the inten...

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Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1140/epjb/e2016-70028-4

Authors


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Institution:
University of Oxford
Division:
MPLS
Department:
Materials
Role:
Author
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Institution:
University of Oxford
Oxford college:
Wolfson College
Role:
Author
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Grant:
EUFP7/ERCGrantNo.239578
EUFP7/GrantNo.604391GrapheneFlagship
Publisher:
Springer Verlag Publisher's website
Journal:
European Physical Journal B Journal website
Volume:
89
Issue:
11
Publication date:
2016-11-02
Acceptance date:
2016-01-01
DOI:
EISSN:
1434-6036
ISSN:
1434-6028
Source identifiers:
660244
Keywords:
Pubs id:
pubs:660244
UUID:
uuid:29203beb-7543-4e4c-87ec-30c15109419e
Local pid:
pubs:660244
Deposit date:
2017-02-14

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