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Division seminars

Bounds on Lorentz violation from observations of extensive air showers

Thursday, 13.12.2018 14:00

Dr. Marcus Niechciol (University of Siegen, Germany)

Abstract:

Due to their extremely high particle energies (up to 10^20 eV), cosmic rays are ideally suited to search for New Physics, for example violations of Lorentz invariance. In the following, isotropic, nonbirefringent Lorentz violation in the photon sector is considered, specializing to the case of a photon velocity larger than the maximum attainable velocity of standard Dirac fermions. Up to now, Earth-based bounds on this type of Lorentz violation have been determined from observations of TeV gamma rays. A novel approach to test Lorentz invariance with improved...

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Dynamics of Photoinduced Charge Transfer Processes in Iron Carbene Photosensitizers

Thursday, 13.12.2018 10:00

Pavel Chábera (Chemical Center, Lund University)

Abstract: Transition-metal complexes are widely used as photosensitizers and photocatalysts, and in light-emitting devices [Chem. Rev. 117, 10940 (2017)]. We have recently demonstrated first iron complex [FeIII(btz)3]3+ exhibiting room temperature photoluminescence from a charge transfer state and show that it has a 100 ps excited state charge transfer lifetime which is unprecedented for any iron complex [Nature 543, 695 (2017)]. This was characterized as a rare low-spin FeIII d5 complex with emission from a long-lived doublet ligand-to-metal charge transfer (2LMCT) state. Absence of...

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Active Quantum Nano-Photonics

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...

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Exotic magnetic interactions in solids: first-principle modeling

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...

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Past seminars

Alexej Perevertov Ph.D. Dynamic and dimensional properties of Barkhausen noise 06.12.2018 14:00
The National Centre of Competence for Materials, Advanced Technologies, Coatings and their Applications (MATCA) 05.12.2018 13:00
Myriam H. Aguirre Advances in thermomagnetic phenomena based on spin Seebeck effects in hybrid nanostructures 04.12.2018 14:00
J. Michael Gottfried Carbon-Based Nanomaterials in 2D Confinement: Surface Reactions, Aromaticity and Molecular Topology 04.12.2018 10:00
Jaromír Chalupský Characterization of focused free-electron laser beams using their imprints in solid materials 28.11.2018 15:00
Jens Paaske Cooper pair induced frustration and nematicity of two-dimensional magnetic adatom lattices 27.11.2018 15:00
Rachel Houtz Color Unified Dynamical Axion 23.11.2018 14:00
Antonino Marciano Non-dynamical torsion from fermions and CMBR phenomenology 22.11.2018 16:00
Dr. Klaus Ellmer Tailoring of Reactive Magnetron Sputtering for the Deposition of Active Semiconducting Films 22.11.2018 13:00
Martin Friák High and medium entropy alloys: a combined experimental and theoretical study 21.11.2018 15:00

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