You are here

Home » Division seminars

Division seminars

KKR-Green's function method - recent developments and applications to ARPES

Tuesday, 25.09.2018 15:00

Ján Minár (New technologies – Research Center, University of West Bohemia, Plzeň)

The modern version of the KKR (Korringa–Kohn–Rostoker) method represents the electronicstructure of a system directly and efficiently in terms of its single-particle Green's function. Direct access to the Green function results in several appealing features. In particular the description of the electronic correlations, disorder and electronic spectroscopies for the nanosystems and surfaces has been developed in the recent years. In the first part of my talk I will review basic ideas of the multiple scattering KKR formalism. Second part will be devoted to the Angle-resolved photoemission...

More »

Advanced Coatings of Nuclear Fuel Cladding

Thursday, 20.09.2018 14:00

Ing. Jan Škarohlíd (doktorand ČVUT)

A new anticorrosion strategy for Zr nuclear fuel claddings will be presented and explained. The dissertation deals with a protection of zirconium (Zr) nuclear fuel cladding material against corrosion in water-cooled nuclear reactors by coating by polycrystalline diamond (PCD) or chromium-aluminum-silicon nitrate (CrAlSiN) layers. It was shown that Zr alloy surfaces can be effectively protected against oxygen and hydrogen uptake at both accident and working temperatures in water-cooled nuclear reactor environments by coating the Zr surface by PCD layer or CrAlSiN each in specific way and for...

More »

Extended spin models and quantum statistics in atomistic simulations

Wednesday, 19.09.2018 15:00

Lars Bergqvist (KTH Royal Institute of Technology, Stockhom, Sweden)

Abstract: An extended atomistic spin model allowing for studies of the finite temperature magnetic properties of alloys is proposed. The model is obtained by extending the Heisenberg Hamiltonian via a parameterization from a first principles basis, interpolating from both the low temperature ferromagnetic and the high temperature paramagnetic reference states. This allows us to treat magnetic systems with varying degree of itinerant character within the model. Satisfactory agreement with both previous theoretical studies and experiments are obtained in terms of Curie...

More »

Going red to make good white, or red phosphors for white light emitting diodes

Tuesday, 04.09.2018 13:00

Prof. M.G. Brik (1Institute of Physics, University of Tartu, Estonia
2College of Sciences, Chongqing University of Posts and Telecommunications, China
3Institute of Physics, Jan Długosz University, Poland

)

The red-light emitting phosphors get more and more attention in the recent years due to various applications, one of the most important of which is related to the solid state lighting and white light emitting diodes (LEDs). The currently used white LEDs suffer from the lack of the red component, which results in the high color correlated temperature (CCT) and low color rendering index (CRI). The phosphors based on the red emission of the Mn4+ ions are excellent candidates for improvement of the white LEDs characteristics. The advantage of these phosphors over those based on the Eu3+ and Sm3+...

More »

Charged individual molecules on insulating films by atomic force microscopy

Tuesday, 04.09.2018 10:00

Shadi Fatayer (IBM Research – Zurich, Rueschlikon, Switzerland)

Here, we present results concerning molecules and their charge-state determination and control on multilayer NaCl films. We demonstrate lateral single electron transfer between molecules (1) and gain insight into charging processes via single-electron tunneling spectroscopy, where we quantify the reorganization energy of a molecule on a NaCl substrate (2). Finally, we show results where the charge state of a complex on top of an insulator plays a key role for its on-surface chemical reaction.

 

References

(1) W. Steurer et al. Nature Communications 114, 036801 (2015)...

More »

Past seminars

R. F. Mamin Delay time of the phase transition to the polar phase in relaxors 23.04.2018 10:00
Michal Šindler Terahertz spectroscopy of thin superconducting films 19.04.2018 10:00
Dr. Philippe Veber Crystal growth of rare Earth sesquioxides for high power lasers and magneto-optical applications 18.04.2018 13:00
I. Titvinidze Non-equilibrium real-space DMFT for correlated heterostuctures with long-range Coulomb interaction 17.04.2018 15:00
Jorge P. Zubelli Inverse Problems, Resampling Monte Carlo Techniques and Applications to Biophysical Systems 16.04.2018 15:00
Benedikt Scharf Testing Topological Protection of Edge States in Hexagonal Quantum Spin Hall Candidate Materials 16.04.2018 11:00
Boris Gorshunov, Mikhail Belyanchikov From incipient ferroelectricity of nano-confined water molecules in beryl to their relaxor-like behavior in cordierite 16.04.2018 10:00
Prof. Udo Schwingenschloegl Elemental 2D materials beyond graphene: Insights from computational theory 13.04.2018 14:00
Tomi Koivisto Symmetric Teleparallelism 12.04.2018 14:00
František Slanina Colloidal particles in nanotubes 10.04.2018 15:00

Pages