scholarly journals Low-energy effective interactions beyond the constrained random-phase approximation by the functional renormalization group

2015 ◽  
Vol 92 (4) ◽  
Author(s):  
Michael Kinza ◽  
Carsten Honerkamp
Keyword(s):  
Renormalization Group ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Low Energy ◽  
Phase Approximation ◽  
Effective Interactions ◽  
Functional Renormalization Group

scholarly journals Elastic scattering of low-energy positron by atom

2005 ◽  
Vol 3 (2) ◽  
pp. 141-149 ◽  
Author(s):  
M.R. Nikolic ◽  
Aleksandar Tancic
Keyword(s):  
Elastic Scattering ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Dyson Equation ◽  
Low Energy ◽  
Phase Approximation ◽  
Correlation Effects ◽  
Slow Positron ◽  
Theoretical Results

In this paper, we present our calculation for the elastic scattering of the slow positron from atoms. The calculation is performed for He, Ne, Xe and Kr. In the calculations we used Random phase approximation. By slowing Dyson equation we take into account the correlation effects. Our results are consistent with experimental and other theoretical results.

scholarly journals Optical potential approach to the slow positron scattering from helium atom

2002 ◽  
Vol 2 (4) ◽  
pp. 183-188 ◽  
Author(s):  
Aleksandar Tancic ◽  
M.R. Nikolic
Keyword(s):  
Elastic Scattering ◽  
Random Phase Approximation ◽  
Optical Potential ◽  
Random Phase ◽  
Low Energy ◽  
Phase Approximation ◽  
Positron Scattering ◽  
Slow Positron ◽  
Experimental Values ◽  
Theoretical Results

We have extended our previous calculations to include the contribution of the random-phase approximation (RPA) (improved) optical potential to the low energy elastic scattering in the electron+He system. Our improved RPA calculations are shown to be in better agreement with the experimental values than other theoretical results.

PAIRING MECHANISM FOR OXYGEN HOLES IN PLANAR CuO2 SYSTEMS

1988 ◽  
Vol 02 (05) ◽  
pp. 771-778
Author(s):  
Ken SASAKI ◽  
Hiroshi BETSUYAKU
Keyword(s):  
Spin Density ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Density Wave ◽  
Spin Density Wave ◽  
Phase Approximation ◽  
Pairing Mechanism ◽  
Effective Interactions ◽  
Oxygen Ions ◽  
Explicit Expressions

Effects of antiferromagnetic fluctuations on the pairing of holes produced on oxygen ions by doping are investigated theoretically for the planar CuO 2 systems in the spin-density-wave (SDW) background. Explicit expressions for singlet and triplet effective interactions are obtained within the random-phase approximation, which predicts great possibilities of singlet pairing. It is shown that the pairing is multiplicatively enhanced by the coexistence of p− and d-holes near the SDW instability.

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