scholarly journals Pair Excitations and Vertex Corrections in Fermi Fluids

2007 ◽  
Vol 148 (3-4) ◽  
pp. 139-143 ◽  
Author(s):  
Helga M. Böhm ◽  
Eckhard Krotscheck ◽  
Martin Panholzer
Keyword(s):  
Vertex Corrections ◽  
Fermi Fluids

Anderson impurity model: Vertex corrections within the finite U non-crossing approximation

2009 ◽  
Vol 404 (18) ◽  
pp. 2861-2864 ◽  
Author(s):  
P. Roura-Bas ◽  
V. Vildosola ◽  
L.O. Manuel ◽  
A.M. Llois
Keyword(s):  
Vertex Corrections ◽  
Impurity Model ◽  
Anderson Impurity Model

scholarly journals Vertex Corrections in Gauge Theories for Two-dimensional Condensed Matter Systems

1998 ◽  
Vol 12 (16n17) ◽  
pp. 1673-1692 ◽  
Author(s):  
Peter Kopietz
Keyword(s):  
Gauge Field ◽  
Condensed Matter ◽  
Finite Energy ◽  
Energy Scale ◽  
Gauge Fields ◽  
Logarithmic Correction ◽  
Two Dimensional ◽  
Numerical Constant ◽  
Self Energy ◽  
Vertex Corrections

We calculate the self-energy of two-dimensional fermions that are coupled to transverse gauge fields, taking two-loop corrections into account. Given a bare gauge field propagator that diverges for small momentum transfers q as 1/qη, 1<η≤ 2, the fermionic self-energy without vertex corrections vanishes for small frequencies ω as Σ(ω)∝ ωγ with γ=2/(1+η)<1. We show that inclusion of the leading radiative correction to the fermion-gauge field vertex leads to Σ(ω)∝ωγ [1-aη ln (ω0/ω)], where aη is a positive numerical constant and ω0 is some finite energy scale. The negative logarithmic correction is consistent with the scenario that higher order vertex corrections push the exponent γ to larger values.

scholarly journals Dynamic many-body theory: Dynamics of strongly correlated Fermi fluids

2010 ◽  
Vol 82 (22) ◽  
Author(s):  
H. M. Böhm ◽  
R. Holler ◽  
E. Krotscheck ◽  
M. Panholzer
Keyword(s):  
Strongly Correlated ◽  
Many Body ◽  
Many Body Theory ◽  
Fermi Fluids ◽  
Body Theory
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