23 citations · 23 across the 1 of their papers we have counts for
7 papers
Disorder Induced Quantum Phase Transition in Random-Exchange Spin-1/2 Chains
K. Hamacher, J. Stolze, W. Wenzel
We investigate the effect of quenched bond-disorder on the anisotropic spin-1/2 (XXZ) chain as a model for disorder induced quantum phase transitions. We find non-universal behavio…
A Stochastic Tunneling Approach for Global Minimization of Complex Potential Energy Landscapes
W. Wenzel, K. Hamacher
We investigate a novel stochastic technique for the global optimization of complex potential energy surfaces (PES) that avoids the freezing problem of simulated annealing by allowi…
Structure of the Hilbert-space of the infinite-dimensional Hubbard model
C. Gros, W. Wenzel
An iterative procedure for the explicit construction of the nontrivial subspace of all symmetry-adapted configurations with non-zero weight in the ground-state of the infinite-dime…
The Scaling Behaviour of Stochastic Minimization Algorithms in a Perfect Funnel Landscape
K. Hamacher, W. Wenzel
We determined scaling laws for the numerical effort to find the optimal configurations of a simple model potential energy surface (PES) with a perfect funnel structure that reflect…
Magnon-magnon interactions in the Spin-Peierls compound CuGeO_3
C. Gros, W. Wenzel, A. Fledderjohann +6
In a magnetic substance the gap in the Raman spectrum, Delta_R, is approximatively twice the value of the neutron scattering gap, Delta_S, if the the magnetic excitations (magnons)…
Frustration induced Raman scattering in CuGeO_3
V. N. Muthukumar, Claudius Gros, Wolfgang Wenzel +7
We present experimental data for the Raman intensity in the spin-Peierls compound CuGeO_3 and theoretical calculations from a one-dimensional frustrated spin model. The theory is b…