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Seminar / Wednesday, 21.11.2018 15:00

Martin Friák (Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22,CZ-616 62 Brno, Czech Republic)

Abstract: Alloys consisting of multiple principal elements in approximately equiatomic concentrations have been termed high (configurational) entropy alloys (HEAs). They represent a very interesting class of materials since certain combinations of elements in a single phase may exhibit a number of unusual physical properties with high potential for applications. The first part of the talk will provide a representative example of HEAs, the equiatomic CrMnFeCoNi alloy, which we studied using both experimental and theoretical tools. In particular, we found that the material...

Seminar / Thursday, 22.11.2018 13:00

Dr. Klaus Ellmer (Optotransmitter-Umweltschutz-Technologie e.V.)

    Magnetron sputtering, invented by the renowned plasma physicist Penning already in 1939, is since more than 30 years a widely used large-area, plasma-assisted deposition method for many industrial applications, mostly used in fields like architectural and low emissivity glass coatings, mirrors and absorbers for solar concentrators, magnetic films for hard disks or hard coatings for tools, i.e., mainly for metals, oxides and nitrides. In the rising thin film photovoltaics industry, magnetron sputtering is only used for the deposition of metallic back contacts (Ag, Mo)...

Seminar / Tuesday, 27.11.2018 15:00

Jens Paaske (Niels Bohr Institute, University of Copenhagen)

Abstract: Apart from their potential for quantum computing, topological superconductors have instigated renewed interest in the intricate interplay between superconductivity and magnetic degrees of freedom. This question dates back to the 1950’ies, but the recent advances in material growth and custom made hybrid materials provide an exciting new perspective on this venerable problem. In this seminar, I will discuss a possible platform for frustrated magnetism utilizing a Cooper pair mediated long-ranged indirect exchange interaction in two-dimensional (2D) magnetic adatom...

Seminar / Wednesday, 28.11.2018 15:00

Jaromír Chalupský (Institute of Physics of the CAS)

An unflagging development of novel X-ray laser sources has stimulated a continuous growth in the X-ray scientific community and in new types of scientific endeavours. Unprecedented progress in X-ray lasing and improvement of all observed laser beam parameters brings ever higher requirements on laser field diagnostics. One of the most challenging issues is a rigorous spatial characterization of focused X-ray laser beams. Owing to excessive radiation intensities and (sub)micron focus sizes, radiation damage, linear response and sufficient resolution power of the sensing element are important...

Seminar / Tuesday, 04.12.2018 10:00

J. Michael Gottfried (Department of Chemistry, University of Marburg, Germany)

The synthesis of carbon-based and heterocyclic nanostructures on surfaces has attracted considerable attention as a versatile approach for the functionalization of interfaces and the preparation of new materials. In this lecture, examples for the on-surface synthesis of novel conjugated hydrocarbon and nitrogen-doped materials, organometallic compounds, and metal complexes with cyclic and open-chain topology will be discussed. Unusual regioselectivity of C-C coupling reactions achieved by monoselective aromatic C-H bond activation will be explained on the basis of a detailed discussion of...

Seminar / Tuesday, 11.12.2018 15:00

S. Khmelevskyi (Center for Computational Materials Science, Vienna University of Technology,Vienna, Austria.)

Abstract: The magnetic materials might be sub-divided into the three major classes that requires special approaches and has specific problems, but also allowing for specific simplifications. This classes are magnetic insulators, 4f-metals with high degree of the magnetic moment localizations and d-metals and intermetallic compounds and alloys. For the first classes an important role of the correlation effects are evident, but quantum Heisenberg model with some modifications provide robust description of the finite temperature magnetic properties. The class of the d-metallic...

Seminar / Wednesday, 12.12.2018 16:00

Ortwin Hess (Imperial College London)

Nanoplasmonics and Metamaterials have in the last 15 years inspired scientists to think about photonics beyond traditional constraints imposed by natural materials in which light propagates to conceive functionalities such as subwavelength imaging and broadband ultraslow light. While most concepts have initially been demonstrated at longer wavelengths and for microwaves, they have continuously moved to optical frequencies and beyond. Embracing nonlinearity and (quantum) gain [1], exciting phenomena such as ‘dark-light’ [2] and cavity-free [3] nano-lasing and room temperature single...