8 papers · 1 filter
T-Matrix Formulation of Impurity Scattering in Correlated Systems
W. Ziegler, D. Poilblanc, R. Preuss +2
Using a generalized T-matrix description which, in principle, exactly includes Coulomb correlations and potential scattering events, resonant and bound impurity states are discusse…
Dynamical Properties of Two Coupled Hubbard Chains at Half-filling
H. Endres, R. M. Noack, W. Hanke +2
Using grand canonical Quantum Monte Carlo (QMC) simulations combined with Maximum Entropy analytic continuation, as well as analytical methods, we examine the one- and two-particle…
SPIN AND CHARGE MODES OF THE t-J LADDER
D. Poilblanc, D. J. Scalapino, W. Hanke
The spin and charge excitations of the t--J ladder are studied by exact diagonalization techniques for several electron densities. The various modes are classified according to the…
Quasiparticle Dispersion of the 2D Hubbard Model: From an Insulator to a Metal
R. Preuss, W. von der Linden, W. Hanke
On the basis of Quantum-Monte-Carlo results the evolution of the spectral weight of the two-dimensional Hubbard model is studied from insulating to metallic behavior…
Conserving approximation for the three-band Hubbard model: flat quasiparticle dispersion
R. Putz, R. Preuss, A. Muramatsu +1
It is shown that the low-energy single-particle excitation-spectrum of the three-band Hubbard model at hole-dopings away from half-filling agrees remarkably well with Quantum Monte…
Binding of Holes to Magnetic Impurities in a Strongly Correlated System
D. Poilblanc, D. J. Scalapino, W. Hanke
The effect of a magnetic (S=1/2) impurity coupled to a 2D system of correlated electrons (described by the t--J model) is studied by exact diagonalisations. It is found that, if th…