TY  - JOUR
A1  - Bialonski, Stephan
A1  - Horstmann, Marie-Therese
A1  - Lehnertz, Klaus
T1  - From brain to earth and climate systems: Small-world interaction networks or not?
JF  - Chaos: An Interdisciplinary Journal of Nonlinear Science
N2  - We consider recent reports on small-world topologies of interaction networks derived from the dynamics of spatially extended systems that are investigated in diverse scientific fields such as neurosciences, geophysics, or meteorology. With numerical simulations that mimic typical experimental situations, we have identified an important constraint when characterizing such networks: indications of a small-world topology can be expected solely due to the spatial sampling of the system along with the commonly used time series analysis based approaches to network characterization.
Y1  - 2010
U6  - http://dx.doi.org/10.1063/1.3360561
SN  - 1089-7682
VL  - 20
IS  - 1
PB  - AIP Publishing
CY  - Melville, NY
ER  - 
TY  - JOUR
A1  - Fleischhaker, Robert
A1  - Evers, Jörg
A1  - Dey, Tarak N.
T1  - Phase modulation induced by cooperative effects in electromagnetically induced transparency
JF  - Physical Review A - Atomic, molecular, and optical physics
N2  - We analyze the influence of dipole-dipole interactions in an electromagnetically induced transparency set up for a density at the onset of cooperative effects. To this end, we include mean-field models for the influence of local-field corrections and radiation trapping into our calculation. We show both analytically and numerically that the polarization contribution to the local field strongly modulates the phase of a weak pulse. We give an intuitive explanation for this local-field-induced phase modulation and demonstrate that it distinctively differs from the nonlinear self-phase-modulation that a strong pulse experiences in a Kerr medium.
Y1  - 2010
U6  - http://dx.doi.org/10.1103/PhysRevA.82.013815
SN  - 1050-2947
VL  - 82
IS  - 1
PB  - AIP Publishing
CY  - Melville, NY
ER  -