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Il'ichev E.V.,Institute For Photonische Technologien
Fizika Nizkikh Temperatur

Based on the numerical solution of nonstationary Ginzburg-Landau equations, we investigated the evolution of the order parameter of superconducting channels of different length under applied voltage (socalled voltage-driven regime). We calculated the current- voltage characteristics for channels of different length and found out the origin of theirs characteristic disorder oscillations. For very long channels in a certain voltage interval we revealed a chaotic dynamics of the order parameter. The collected data allowed us to plot the most complete and detailed phase diagram of the resistive state of the superconducting channel in the voltage-driven regime. Source

Il'ichev E.,Institute For Photonische Technologien
Fizika Nizkikh Temperatur

The transmission coefficient of microwave wave-guide lines with different Josephson junction circuits has been calculated. The resonance modes in lines manifest themselves as sharp dips in the transmission power. The shape and the position of these dips de-pend both on external magnetic field and applied mi-crowave power. The results of calculation can be use-ful for design and implementation of modern cryoelectronics microwave superconducting devices. Source

Stockel S.,Friedrich - Schiller University of Jena | Meisel S.,Friedrich - Schiller University of Jena | Elschner M.,Friedrich Loeffler Institute | Rosch P.,Friedrich - Schiller University of Jena | And 2 more authors.
Angewandte Chemie - International Edition

Better safe than sorry: A combined analytical procedure consisting of Raman spectroscopy and chemometrics can be used to test for anthrax endospores in environmental samples. Time-consuming enrichment steps are not required and low levels of anthrax endospores in household substances like baking powder can be detected within 3h and discriminated against other nonpathogenic Bacillus species with typing accuracies of up to 99 %. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Vargas Jentzsch P.,Friedrich - Schiller University of Jena | Ciobota V.,Friedrich - Schiller University of Jena | Rosch P.,Friedrich - Schiller University of Jena | Popp J.,Friedrich - Schiller University of Jena | Popp J.,Institute For Photonische Technologien
Angewandte Chemie - International Edition

Climate science: When different salts occurring in atmospheric particles combine during a coagulation process and interact with humid air, some reactions can take place and modify the salt composition (see picture). The hygroscopicity of certain salts favors the formation of a liquid H2O film on the solid material. The salts partially dissolve and the ions can react with each other. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Gompf B.,University of Stuttgart | Braun J.,University of Stuttgart | Weiss T.,University of Stuttgart | Giessen H.,University of Stuttgart | And 2 more authors.
Physical Review Letters

Polarization rotation in isotropic materials is commonly associated with chirality, i.e., structures with a handedness which are not identical with their mirror image. We observe this effect in the visible and near-IR regions at oblique incidence in the optical response of a subwavelength square array of holes. Mapping the complete k→ space via Mueller-matrix spectroscopic ellipsometry, we find that in specific directions the rotary power is orders of magnitude larger than that observed for chiral molecules. Although experimentally indistinguishable, the physics behind the two phenomena is fundamentally different: While optical activity is a consequence of magnetic interactions, nanostructures on a square lattice rotate the polarization due to spatial dispersion. © 2011 American Physical Society. Source

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