scholarly journals Dynamically screened vertex correction to GW

2020 ◽  
Vol 102 (4) ◽  
Author(s):  
Y. Pavlyukh ◽  
G. Stefanucci ◽  
R. van Leeuwen
Keyword(s):  
Vertex Correction

Vertex Correction to RPA and Superconductivity in the Two-Dimensional Hubbard Model

1989 ◽  
Vol 58 (12) ◽  
pp. 4576-4599 ◽  
Author(s):  
Kenji Yonemitsu
Keyword(s):  
Hubbard Model ◽  
Vertex Correction ◽  
Two Dimensional

scholarly journals Exploring excitonic signal in optical conductivity of ZnO through first-order electron-hole vertex correction

2018 ◽  
Vol 1011 ◽  
pp. 012073
Author(s):  
Humaira Khoirunnisa ◽  
Muhammad Aziz Majidi
Keyword(s):  
Optical Conductivity ◽  
Vertex Correction ◽  
Electron Hole ◽  
First Order

scholarly journals ONE-ELECTRON SPECTRAL WEIGHT OF DOPED MOTT INSULATORS IN GAUGE FIELD THEORY APPROACH

1996 ◽  
Vol 10 (27) ◽  
pp. 3727-3736
Author(s):  
H.C. LEE
Keyword(s):  
Field Theory ◽  
Gauge Field ◽  
Spectral Weight ◽  
Low Energy ◽  
Vertex Correction ◽  
Gauge Field Theory ◽  
Mott Insulators ◽  
Theory Approach ◽  
Two Dimensional ◽  
Second Order Perturbation Theory

The electron spectral weight of doped Mott insulators based on the two-dimensional slave boson gauge field theory is studied. The vertex correction with static gauge field is calculated in the second order perturbation theory. The vertex correction is found to be singular at low energy and requires non-perturbative treatments.

scholarly journals Spectral function method for Hall conductivity of incoherent metals

2017 ◽  
Vol 31 (14) ◽  
pp. 1750112
Author(s):  
Osamu Narikiyo
Keyword(s):  
Spectral Function ◽  
Fermi Liquid ◽  
Function Method ◽  
Hall Conductivity ◽  
Vertex Correction ◽  
Metallic State ◽  
Fermi Liquid Theory ◽  
Liquid Theory ◽  
Exchange Approximation

Using a model spectral function of the electron, the Hall conductivity in the normal metallic state of the Pr[Formula: see text]CexCuO4 (PCCO) superconductor is calculated neglecting the current vertex-correction. The result is qualitatively consistent with the experiment. Consequently, the reason becomes clear why the Fermi-liquid theory fails to explain the anomaly of the Hall conductivity. The inconsistency of the fluctuation-exchange approximation also becomes clear.

Hartree-Fock and lowest-order vertex-correction contribution to the direct gap of the semiconductor silicon

1989 ◽  
Vol 40 (17) ◽  
pp. 11659-11665 ◽  
Author(s):  
R. Daling ◽  
W. van Haeringen
Keyword(s):  
Vertex Correction ◽  
Hartree Fock ◽  
Semiconductor Silicon

Vertex correction effects on nonlinear optical response

1985 ◽  
Vol 55 (5) ◽  
pp. 397-400 ◽  
Author(s):  
H. Tsunetsugu ◽  
E. Hanamura
Keyword(s):  
Nonlinear Optical ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Vertex Correction

VERTEX CORRECTIONS IN THE NUCLEAR SCHWINGER–DYSON FORMALISM

2002 ◽  
Vol 11 (04) ◽  
pp. 321-333 ◽  
Author(s):  
MASAHIRO NAKANO ◽  
HIROYUKI MATSUURA ◽  
TAISUKE NAGASAWA ◽  
KEN-ICHI MAKINO ◽  
NOBUO NODA ◽  
...  
Keyword(s):  
Field Theory ◽  
Correlation Energy ◽  
Mean Field Theory ◽  
Mean Field ◽  
The Other ◽  
Vertex Correction ◽  
Hartree Fock ◽  
Vertex Corrections ◽  
Negative Correlation Energy ◽  
Self Consistent

We develop the Nuclear Schwinger–Dyson (NSD) formalism to include the effects of ladder diagrams by modifying the vertex. In this extension, the NSD equation sums up both ring diagrams and ladder diagrams self-consistently. The results are compared with mean field theory, Hartree Fock and bare-vertex NSD calculations. It is shown that the vertex correction is important from the following viewpoints. First, the vertex correction greatly modifies the meson propagators, and we can avoid the ghost-pole from meson propagators in a self-consistent way. Secondly, it gives a large negative correlation-energy compared with the other calculations; as a result, it gives a softer equation of state which is preferable according to the experimental data.

Vertex-Correction-Driven Intersubband Spin-Density Excitonic Instability in Double Quantum Well Structures

1994 ◽  
Vol 73 (14) ◽  
pp. 1971-1974 ◽  
Author(s):  
S. Das Sarma ◽  
P. I. Tamborenea
Keyword(s):  
Quantum Well ◽  
Spin Density ◽  
Vertex Correction ◽  
Double Quantum ◽  
Quantum Well Structures ◽  
Double Quantum Well

Towards numerical implementation of the relativistically covariant many-body perturbation theoryThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

2009 ◽  
Vol 87 (7) ◽  
pp. 817-824 ◽  
Author(s):  
Daniel Hedendahl ◽  
Ingvar Lindgren ◽  
Sten Salomonson
Keyword(s):  
Standard Procedure ◽  
Operator Method ◽  
Vertex Correction ◽  
Many Body ◽  
Atomic Systems ◽  
Self Energy ◽  
Electron Positron ◽  
Many Body Perturbation Theory ◽  
Qed Effects ◽  
First Time

The standard procedure for relativistic many-body perturbation theory (RMBPT) is not relativistically covariant, and the effects of retardation, virtual-electron-positron-pair, and radiative effects (self-energy, vacuum polarisation, and vertex correction) — the so-called QED effects — are left out. The energy contribution from the QED effects can be evaluated by the covariant evolution operator method, which has a structure that is similar to that of RMBPT, and it can serve as a merger between QED and RMBPT. The new procedure makes it, in principle, possible for the first time to evaluate QED effects together with correlation to high order. The procedure is now being implemented, and it has been shown that the effect of electron correlation on first-order QED for He-like neon dominates heavily over second-order QED effects.

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