scholarly journals Dynamical screening effects in correlated materials: Plasmon satellites and spectral weight transfers from a Green's function ansatz to extended dynamical mean field theory

2012 ◽  
Vol 85 (3) ◽  
Author(s):  
Michele Casula ◽  
Alexey Rubtsov ◽  
Silke Biermann
Keyword(s):  
Field Theory ◽  
Green’S Function ◽  
Green's Function ◽  
Mean Field Theory ◽  
Mean Field ◽  
Spectral Weight ◽  
Dynamical Mean Field Theory ◽  
Dynamical Screening

scholarly journals Combined GW and dynamical mean-field theory: Dynamical screening effects in transition metal oxides

2012 ◽  
Vol 100 (6) ◽  
pp. 67001 ◽  
Author(s):  
Jan M. Tomczak ◽  
Michele Casula ◽  
Takashi Miyake ◽  
Ferdi Aryasetiawan ◽  
Silke Biermann
Keyword(s):  
Field Theory ◽  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Mean Field Theory ◽  
Mean Field ◽  
Dynamical Mean Field Theory ◽  
Dynamical Screening

scholarly journals EQUATION-OF-MOTION APPROACH TO DYNAMICAL MEAN FIELD THEORY

2006 ◽  
Vol 20 (25) ◽  
pp. 1629-1636 ◽  
Author(s):  
JIAN-XIN ZHU ◽  
R. C. ALBERS ◽  
J. M. WILLS
Keyword(s):  
Field Theory ◽  
Mean Field Theory ◽  
Mean Field ◽  
Bethe Lattice ◽  
Equation Of Motion ◽  
Spectral Weight ◽  
Dynamical Mean Field Theory ◽  
Strongly Correlated ◽  
Strongly Correlated Materials ◽  
Weight Transfer

We propose using an equation-of-motion approach as an impurity solver for dynamical mean field theory. As an illustration of this technique, we consider a finite-U Hubbard model defined on the Bethe lattice with infinite connectivity at arbitrary filling. Depending on the filling, the spectra that is obtained exhibits a quasiparticle peak, and lower and upper Hubbard bands as typical features of strongly correlated materials. The results are also compared and in good agreement with exact diagonalization. We also find a different picture of the spectral weight transfer than the iterative perturbation theory.

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