25 citations · 109 across the 9 of their papers we have counts for
9 papers
Dynamical correlations in one-dimensional charge-transfer insulators
Karlo Penc, Walter Stephan
The single-particle spectral function and the density response of a two band Emery model for CuO chains is calculated for large on-site Cu repulsion U and large on-site energy diff…
Is There a Phase Transition in the Isotropic Heisenberg Antiferromagnet on the Triangular Lattice?
W. Stephan, B. W. Southern
The phase diagram of the classical anisotropic (XXZ) Heisenberg model on the 2-dimensional triangular lattice is investigated using Monte Carlo methods. In the easy-axis limit, two…
Monte Carlo Study of the Anisotropic Heisenberg Antiferromagnet on the Triangular Lattice
W. Stephan, B. W. Southern
We report a Monte Carlo study of the classical antiferromagnetic Heisenberg model with easy axis anisotropy on the triangular lattice. Both the free energy cost for long wavelength…
Small polaron formation in many-particle states of the Hubbard-Holstein model: The one-dimensional case
Massimo Capone, Marco Grilli, Walter Stephan
We investigate polaron formation in a many-electron system in the presence of a local repulsion sufficiently strong to prevent local-bipolaron formation. Specifically, we consider…
Coulomb correlations and coherent charge tunneling in mesoscopic coupled rings
C. M. Canali, W. Stephan, L. Y. Gorelik +2
We study the effect of a strong electron-electron (e-e) interaction in a system of two concentric one-dimensional rings with incommensurate areas A_1 and A_2, coupled by a tunnel a…
Ordering effect of Coulomb interaction in ballistic double-ring systems
C. M. Canali, W. Stephan, L. Y. Gorelik +2
We study a model of two concentric onedimensional rings with incommensurate areas and , in a constant magnetic field. The two rings are coupled by a nonhomogeneous inter…