Criterion for validity of many-body perturbation theory of the electron gas
- 23 August 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 71 (8) , 1220-1221
- https://doi.org/10.1103/physrevlett.71.1220
Abstract
The purpose of this paper is to point out the steps in conventional many-body perturbation theory which requires separate, additional justification over and above convergence of the pertubation series. The questionable step is the cancellation of the renormalized energy shift by the chemical potential, neglecting any possible modification of the wave functions as well as state-dependent energy shifts.Keywords
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