185 citations · 304 across the 10 of their papers we have counts for
10 papers
Minimizing and Maximizing the Shannon Entropy for Fixed Marginals
Paula Franke, Kay Hamacher, Paul Manns
The mutual information (MI) between two random variables is an important correlation measure in data analysis. The Shannon entropy of a joint probability distribution is the variab…
SPIKE: Secure and Private Investigation of the Kidney Exchange problem
Timm Birka, Kay Hamacher, Tobias Kussel +2
Background: The kidney exchange problem (KEP) addresses the matching of patients in need for a replacement organ with compatible living donors. Ideally many medical institutions sh…
Incomplete information in scale-free networks
K. Hamacher
We investigate the effect of incomplete information on the growth process of scale-free networks - a situation that occurs frequently e.g. in real existing citation networks. Two m…
Breakdown of the Luttinger sum-rule at the Mott-Hubbard transition in the one-dimensional t1-t2 Hubbard model
Claudius Gros, Kay Hamacher, Wolfgang Wenzel
We investigate the momentum distribution function near the Mott-Hubbard transition in the one-dimensional t1-t2 Hubbard model (the zig-zag Hubbard chain), with the density-matrix r…
Interaction induced collapse of a section of the Fermi sea in in the zig-zag Hubbard ladder
Kay Hamacher, Claudius Gros, Wolfgang Wenzel
Using the next-nearest neighbor (zig-zag) Hubbard chain as an one dimemensional model, we investigate the influence of interactions on the position of the Fermi wavevectors with th…
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…