Towards numerically accurate many-body perturbation theory: Short-range correlation effects

2014 ◽  
Vol 141 (16) ◽  
pp. 164127 ◽  
Author(s):  
Andris Gulans
Keyword(s):  
Perturbation Theory ◽  
Short Range ◽  
Correlation Effects ◽  
Many Body ◽  
Short Range Correlation ◽  
Range Correlation ◽  
Many Body Perturbation Theory

Short range correlation effects in MnO

1982 ◽  
Vol 92 (2) ◽  
pp. 93-94 ◽  
Author(s):  
A. Bakhshai ◽  
N.E. Brener
Keyword(s):  
Short Range ◽  
Correlation Effects ◽  
Short Range Correlation ◽  
Range Correlation

A study of short-range correlation effects on nuclear spatial and momentum distribution

1987 ◽  
Vol 328 (4) ◽  
pp. 393-397
Author(s):  
A. Małecki ◽  
A. N. Antonov ◽  
I. Zh. Petkov ◽  
P. E. Hodgson
Keyword(s):  
Momentum Distribution ◽  
Short Range ◽  
Correlation Effects ◽  
Short Range Correlation ◽  
Range Correlation

SHORT-RANGE CORRELATION EFFECTS IN A POLARON GAS IN GaAs–AlGaAs QUANTUM WELL WIRES

1999 ◽  
Vol 13 (22n23) ◽  
pp. 819-827 ◽  
Author(s):  
ANTÔNIO NEWTON BORGES ◽  
FRANCISCO A. P. OSÓRIO ◽  
PAULO CÉSAR MIRANDA MACHADO ◽  
OSCAR HIPÓLITO
Keyword(s):  
Quantum Well ◽  
Short Range ◽  
Rectangular Cross Section ◽  
Random Phase ◽  
Field Approximation ◽  
Correlation Effects ◽  
Short Range Correlation ◽  
Electronic Density ◽  
Quantum Well Wire ◽  
Range Correlation

We investigate the short-range correlation effects of plasmon–phonon collective excitations in a quantum well wire by using the self-consistent field approximation theory proposed by Singwi, Tosi, Land and Sjolander [Phys. Rev.176, 589 (1968)]. In our calculation model, we consider a three-subband model with only one populated, for a rectangular cross-section quantum well wire with infinite height for the potential barrier. We have verified that by decreasing the wire width (and/or decreasing the electronic density), the local field correction effects are increased. We compare the present results with those obtained within the Random Phase Approximation throughout the paper and found that the differences between the two calculation methods are more significant for the intrasubband plasmon.

scholarly journals HYPERFINE STRUCTURE PARAMETERS FOR COMPLEX ATOMS WITHIN RELATIVISTIC MANY-BODY PERTURBATION THEORY

2021 ◽  
pp. 52-59
Author(s):  
M. Makushkina ◽  
O. Antoshkina ◽  
O. Khetselius
Keyword(s):  
Perturbation Theory ◽  
Hyperfine Structure ◽  
Finite Size ◽  
Structure Parameters ◽  
Radiative Corrections ◽  
Correlation Effects ◽  
Many Body ◽  
Radium Isotope ◽  
Hartree Fock ◽  
Many Body Perturbation Theory

The calculational results for the hyperfine structure (HFS) parameters for the Mn atom (levels of the configuration 3d64s) and  the results of advanced calculating the HFS constants and nuclear quadrupole moment for the radium isotope are obtained on the basis of computing within the relativistic many-body perturbation theory formalism with a correct and effective taking into account the exchange-correlation, relativistic, nuclear and radiative corrections. Analysis of the data shows that an account of the interelectron correlation effects is crucial in the calculation of the hyperfine structure parameters.  The fundamental reason of physically reasonable agreement between theory and experiment is connected with the correct taking into account the inter-electron correlation effects, nuclear (due to the finite size of a nucleus), relativistic and radiative corrections. The key difference between the results of the relativistic Hartree-Fock Dirac-Fock and many-body perturbation theory methods calculations is explained by using the different schemes of taking into account the inter-electron correlations as well as nuclear and radiative ones.

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