Accurate Quasiparticle Spectra from the T-Matrix Self-Energy and the Particle–Particle Random Phase Approximation

2017 ◽  
Vol 8 (14) ◽  
pp. 3223-3227 ◽  
Author(s):  
Du Zhang ◽  
Neil Qiang Su ◽  
Weitao Yang
Keyword(s):  
Random Phase Approximation ◽  
Random Phase ◽  
Phase Approximation ◽  
Self Energy ◽  
T Matrix

SELF-CONSISTENT T-MATRIX APPROXIMATION TO THE HUBBARD MODEL FOR A FINITE NUMBER OF SITES

2009 ◽  
Vol 23 (16) ◽  
pp. 2049-2062
Author(s):  
MOHSEN JEMAÏ
Keyword(s):  
Finite Number ◽  
Hubbard Model ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Fermi Gas ◽  
Phase Approximation ◽  
Matrix Approximation ◽  
Numerical Effort ◽  
Self Consistent ◽  
T Matrix

Within the 1D Hubbard model, linear closed chains with various numbers of sites are considered in particle–particle self-consistent random phase approximation (SCRPA) for the T-matrix. Encouraging results with a minimal numerical effort are obtained, confirming earlier results with this theory for other models. SCRPA solves the two-site problem exactly. It therefore contains the two electrons and high density Fermi gas limits correctly.

scholarly journals Explicit description of complexation between oppositely charged polyelectrolytes as an advantage of the random phase approximation over the scaling approach

2017 ◽  
Vol 19 (40) ◽  
pp. 27580-27592 ◽  
Author(s):  
Artem M. Rumyantsev ◽  
Igor I. Potemkin
Keyword(s):  
Random Phase Approximation ◽  
Correction Term ◽  
Random Phase ◽  
The Self ◽  
Explicit Description ◽  
Phase Approximation ◽  
Self Energy ◽  
Linear Chains ◽  
The Difference ◽  
Oppositely Charged

Formation of single globules via 1 : 1 complexation of oppositely charged linear chains occurs prior to coacervation. Fcorr is proved to be negative which is the difference between the random phase approximation (RPA) correction term and the self-energy of the chains.

Interpretation of Preferential Adsorption Using Random Phase Approximation Theory

1995 ◽  
Vol 60 (10) ◽  
pp. 1641-1652 ◽  
Author(s):  
Henri C. Benoît ◽  
Claude Strazielle
Keyword(s):  
Approximation Theory ◽  
Random Phase Approximation ◽  
Virial Coefficient ◽  
Random Phase ◽  
Second Virial Coefficient ◽  
Solvent Mixture ◽  
Gyration Radius ◽  
Thermodynamic Quantities ◽  
Phase Approximation ◽  
Preferential Adsorption

It has been shown that in light scattering experiments with polymers replacement of a solvent by a solvent mixture causes problems due to preferential adsorption of one of the solvents. The present paper extends this theory to be applicable to any angle of observation and any concentration by using the random phase approximation theory proposed by de Gennes. The corresponding formulas provide expressions for molecular weight, gyration radius, and the second virial coefficient, which enables measurements of these quantities provided enough information on molecular and thermodynamic quantities is available.

Neutrino reactions onC12by the quasiparticle random-phase approximation (QRPA)

2010 ◽  
Vol 81 (2) ◽  
Author(s):  
Myung-Ki Cheoun ◽  
Eunja Ha ◽  
Su Youn Lee ◽  
K. S. Kim ◽  
W. Y. So ◽  
...  
Keyword(s):  
Random Phase Approximation ◽  
Random Phase ◽  
Phase Approximation ◽  
Quasiparticle Random Phase Approximation
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