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13 papers · 1 filter
Noise-Induced Transition from Translational to Rotational Motion of Swarms
Udo Erdmann, Werner Ebeling, Alexander S. Mikhailov
We consider a model of active Brownian agents interacting via a harmonic attractive potential in a two-dimensional system in the presence of noise. By numerical simulations, we sho…
Theory of field induced spin reorientation transition in thin Heisenberg films
S. Schwieger, J. Kienert, W. Nolting
We consider the spin reorientation transition in a ferromagnetic Heisenberg monolayer with a second order single ion anisotropy as a function of temperature and external field. Up…
On-diagonal singularities of the Green functions for Schroedinger operators
Jochen Bruening, Vladimir Geyler, Konstantin Pankrashkin
We investigate the behavior of the Green functions of Schroedinger operators near the diagonal. The only non-trivial cases, where the on-diagonal singularities are non-zero and do…
Advantages of Hopping on a Zig-zag Course
Lutz Schimansky-Geier, Udo Erdmann, Niko Komin
We investigate self-moving particles which prefer to hop with a certain turning angle equally distributed to the right or left. We assume this turning angle distribution to be give…
Non-perturbative tests of HQET in small-volume quenched QCD
Jochen Heitger, Andreas Juttner, Rainer Sommer +1
We quantitatively investigate the quark mass dependence of current matrix elements and energies, calculated over a wide range of quark masses in the continuum limit of small-volume…
Disorder in Diluted Spin Systems
S. Hilbert, W. Nolting
The influence of substitutional disorder on the magnetic properties of diluted Heisenberg spin systems is studied with regard to the magnetic stability of ferromagnetic diluted sem…