52 citations · 87 across the 6 of their papers we have counts for
6 papers
Green's functions and equations of motion in correlated many body systems
Qingguo Feng
In this paper some new physical notations are given for the Green's functions and equations of motion (EOM) in many body physics with the concept of quasiparticles. It shows how th…
Spin and orbital hybridization at specifically nested Fermi surfaces in URuSi
Peter M. Oppeneer, Saad Elgazzar, Jan Rusz +3
The Fermi surface (FS) nesting properties of URuSi are analyzed with particular focus on their implication for the mysterious hidden order phase. We show that there exist t…
Investigation of on-site inter-orbital single electron hoppings in general multi-orbital systems
Qingguo Feng, Peter M. Oppeneer
A general multi-orbital Hubbard model, which includes on-site inter-orbital electron hoppings, is introduced and studied. It is shown that the on-site inter-orbital single electron…
Advanced multi-orbital impurity solver for dynamical mean field theory based on the equation of motion approach
Qingguo Feng, P. M. Oppeneer
We propose an improved fast multi-orbital impurity solver for the dynamical mean field theory (DMFT) based on equations of motion (EOM) of Green's functions and decoupling scheme.…
Fast multi-orbital equation of motion impurity solver for dynamical mean field theory
Qingguo Feng, P. M. Oppeneer
We propose a fast multi-orbital impurity solver for the dynamical mean field theory (DMFT). Our DMFT solver is based on the equations of motion (EOM) for local Green's functions an…
A fast impurity solver based on equations of motion and decoupling
Qingguo Feng, Yuzhong Zhang, Harald O. Jeschke
In this paper a fast impurity solver is proposed for dynamical mean field theory (DMFT) based on a decoupling of the equations of motion for the impurity Greens function. The resul…