221 citations · 1.1k across the 16 of their papers we have counts for
12 papers · 1 filter
Breakdown of traditional many-body theories for correlated electrons
O. Gunnarsson, G. Rohringer, T. Schäfer +2
Starting from the (Hubbard) model of an atom, we demonstrate that the uniqueness of the mapping from the interacting to the noninteracting Green's function, , is strongly…
Non-perturbative landscape of the Mott-Hubbard transition: Multiple divergence lines around the critical endpoint
T. Schäfer, S. Ciuchi, M. Wallerberger +5
We analyze the highly non-perturbative regime surrounding the Mott-Hubbard metal-to-insulator transition (MIT) by means of dynamical mean field theory calculations at the two-parti…
Efficient real frequency solver for dynamical mean field theory
Y. Lu, M. Höppner, O. Gunnarsson +1
We here present how a self-consistent solution of the dynamical mean field theory equations can be obtained using exact diagonalization of an Anderson impurity model with accuracie…
Divergent Precursors of the Mott-Hubbard Transition at the Two-Particle Level
T. Schäfer, G. Rohringer, O. Gunnarsson +3
Identifying the fingerprints of the Mott-Hubbard metal-insulator transition may be quite elusive in correlated metallic systems if the analysis is limited to the single particle le…
Analytical continuation of imaginary axis data for optical conductivity
O. Gunnarsson, M. W. Haverkort, G. Sangiovanni
We compare different methods for performing analytical continuation of spectral data from the imaginary time or frequency axis to the real frequency axis for the optical conductivi…
Electron-phonon coupling in the self-consistent Born approximation of the t-J model
O. Gunnarsson, O. Rösch
We study an undoped t-J model with electron-phonon interaction using the self-consistent Born approximation (SCBA). By neglecting vertex corrections, the SCBA solves a boson-holon…