14 papers
Pair Phase Fluctuations and the Pseudogap
T. Eckl, D. J. Scalapino, E. Arrigoni +1
The single-particle density of states and the tunneling conductance are studied for a two-dimensional BCS-like Hamiltonian with a d_{x^2-y^2}-gap and phase fluctuations. The latter…
Stripes and superconducting pairing in the t-J model with Coulomb interactions
E. Arrigoni, A. P. Harju, W. Hanke +2
We study the competition between long- and short-range interactions among charge carriers in strongly-correlated electronic systems employing a new method which combines the densit…
An SO(5) Symmetric Ladder
D. Scalapino, Shou-Cheng Zhang, W. Hanke
We construct an SO(5) symmetric electron model on a two-chain ladder with purely local interactions on a rung. The ground state phase diagram of this model is determined in the str…
Electron transport in coupled chains of interacting fermions with impurities
E. Arrigoni, B. Brendel, W. Hanke
We study the low-temperature transport of a doped two-chain ladder system of interacting fermions in the presence of a barrier or of a low concentration of impurities. Above a cert…
Friedel oscillations induced by non-magnetic impurities in the two-dimensional Hubbard model
W. Ziegler, H. Endres, W. Hanke
We study the interplay of correlations and disorder using an unrestricted Slave-Boson technique in real space. Within the saddle-point approximation, we find Friedel oscillations o…
Pseudogaps and their Interplay with Magnetic Excitations in the doped 2D Hubbard Model
R. Preuss, W. Hanke, C. Gröber +1
On the basis of Quantum Monte Carlo simulations of the two-dimensional Hubbard model which cover the doping range from the under- to the over-doped regime, we find that the single-…