scholarly journals Bilayer graphene spectral function in the random phase approximation and self-consistent GW approximation

2013 ◽  
Vol 88 (8) ◽  
Author(s):  
Andro Sabashvili ◽  
Stellan Östlund ◽  
Mats Granath
Keyword(s):  
Spectral Function ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Bilayer Graphene ◽  
Phase Approximation ◽  
Gw Approximation ◽  
Self Consistent

THE NUMBER SELF-CONSISTENT RENORMALIZED RANDOM PHASE APPROXIMATION

2006 ◽  
Vol 20 (30n31) ◽  
pp. 5334-5337
Author(s):  
A. MARIANO
Keyword(s):  
Charge Exchange ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Critical Value ◽  
Phase Approximation ◽  
Heavy Nuclei ◽  
Electromagnetic Transitions ◽  
Self Consistent ◽  
Eigen Values ◽  
Beta Decays

RPA and its quasiparticle generalization (QRPA) have been widely used to study electromagnetic transitions and beta decays in medium and heavy nuclei, being the pn-QRPA charge exchange mode extensively employed in the description of single and double beta decays in vibrational nuclei. However develops a collapse, i.e. it presents imaginary eigen-values for strengths beyond a critical value of the force. Extensions called renormalized QRPA (RQRPA) do not develop any collapse going beyond the simplest quasiboson approximation, however they present several drawbacks which will be analyzed.

Towards a self-consistent random-phase approximation for Fermi systems

1996 ◽  
Vol 54 (24) ◽  
pp. 17536-17546 ◽  
Author(s):  
F. Catara ◽  
G. Piccitto ◽  
M. Sambataro ◽  
N. Van Giai
Keyword(s):  
Random Phase Approximation ◽  
Random Phase ◽  
Phase Approximation ◽  
Fermi Systems ◽  
Self Consistent
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