scholarly journals Improving accuracy and efficiency of calculations of photoemission spectra within the many-body perturbation theory

2012 ◽  
Vol 85 (8) ◽  
Author(s):  
Huy-Viet Nguyen ◽  
T. Anh Pham ◽  
Dario Rocca ◽  
Giulia Galli
Keyword(s):  
Perturbation Theory ◽  
Many Body ◽  
Many Body Perturbation Theory ◽  
The Many ◽  
Improving Accuracy

scholarly journals Surface chemistry effects on work function, ionization potential and electronic affinity of Si(100), Ge(100) surfaces and SiGe heterostructures

2020 ◽  
Vol 22 (44) ◽  
pp. 25593-25605
Author(s):  
Ivan Marri ◽  
Michele Amato ◽  
Matteo Bertocchi ◽  
Andrea Ferretti ◽  
Daniele Varsano ◽  
...  
Keyword(s):  
Perturbation Theory ◽  
Surface Chemistry ◽  
Work Function ◽  
Ionization Potential ◽  
Many Body ◽  
Many Body Perturbation Theory ◽  
The Many ◽  
Electronic Affinity

Surface chemistry effects are calculated within the many body perturbation theory for Si(100), Ge(100) and SiGe surfaces.

The calculation of higher-order energies in the many-body perturbation theory series

1985 ◽  
Vol 113 (1) ◽  
pp. 8-12 ◽  
Author(s):  
P.J. Knowles ◽  
K. Somasundram ◽  
N.C. Handy ◽  
K. Hirao
Keyword(s):  
Perturbation Theory ◽  
Higher Order ◽  
Many Body ◽  
Many Body Perturbation Theory ◽  
The Many ◽  
Theory Series

scholarly journals Many-Electron QED with Redefined Vacuum Approach

Symmetry ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1014
Author(s):  
Romain N. Soguel ◽  
Andrey V. Volotka ◽  
Dmitry A. Glazov ◽  
Stephan Fritzsche
Keyword(s):  
Perturbation Theory ◽  
Electronic Configuration ◽  
Bound State ◽  
Many Body ◽  
Photon Exchange ◽  
Self Energy ◽  
Many Body Perturbation Theory ◽  
Formula Derivation ◽  
The Many ◽  
The One

The redefined vacuum approach, which is frequently employed in the many-body perturbation theory, proved to be a powerful tool for formula derivation. Here, we elaborate this approach within the bound-state QED perturbation theory. In addition to general formulation, we consider the particular example of a single particle (electron or vacancy) excitation with respect to the redefined vacuum. Starting with simple one-electron QED diagrams, we deduce first- and second-order many-electron contributions: screened self-energy, screened vacuum polarization, one-photon exchange, and two-photon exchange. The redefined vacuum approach provides a straightforward and streamlined derivation and facilitates its application to any electronic configuration. Moreover, based on the gauge invariance of the one-electron diagrams, we can identify various gauge-invariant subsets within derived many-electron QED contributions.

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