Fyzikální ústav Akademie věd ČR

Semináře

Surface engineering of indirect bandgap semiconductor nanoparticles for enhanced optical properties

Čt, 04/02/2016 - 13:00 - 14:00

Katerina Dohnalova (Institute of Physics, University of Amsterdam, Science Park 904, 1018XH Amsterdam, The Netherlands)

IV-group bulk crystalline semiconductors, Diamond (C), Silicon and Germanium, all possess diamond structure and indirect bandgaps. The latter property results in very poor emission and band-edge absorption, limiting their use in optoelectronic and photonic applications. In nanocrystal form, oscillator strength is enhanced via the spatial confinement of carriers, which leads to relaxation of the k-selection rule and band-mixing.

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Anomalous Hall Effect in antiferromagnets

Út, 09/02/2016 - 10:00 - 11:30

Karel Výborný (FzÚ)

(Přednáška o článku Nature 527, 212 (2015) ze série Journal Club.) The common notion that the anomalous Hall effect (AHE) is propor- tional to magnetisation M suggests that antiferromagnets with M = 0 should exhibit no AHE. Despite this intuition, when certain symmetries are broken, AHE was still predicted to appear in multi-sublattice antiferromagnets with M = 0 (such as IrMn3 or Mn3Sn). Re- cently, this prediction has been confirmed experimentally and the magnitude of AHE was even found to exceed that of ordinary ferromagnetic metals.

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Minulé semináře
Miroslav Havránek Senzory a elektronika pro upgrade pixelového detektoru v experimentu ATLAS 30.10.2014 14:00
Dr. Andreas Undisz Oxide layers on biomedical NiTi alloy – formation mechanism, mechanical stability and consequences for short- and long-term Ni-release 30.10.2014 14:00
Artem Ryabov Diffusion of a tagged particle in open single-file systems 21.10.2014 15:00
Miloš V. Lokajíček Elastický rozptyl protonů a platnost optického teorému v silných interakcích 16.10.2014 14:00
Jiří Chýla Jak byly objeveny kvarky 15.10.2014 15:00
Harald Oberhofer A theoretical description of water splitting on metal decorated oxide surfaces 14.10.2014 10:00
Richard Lednický Joint Institute for Nuclear Research in Dubna: past, presence and future 13.10.2014 14:00
Yasuo Koide Diamond Field Effect Transistors with high-k gate insulator 09.10.2014 10:00
Nikolaj Moll Molecular Geometry Determination by Atomic Force Microscopy 07.10.2014 10:00
Petr Ondrejkovič Dynamics of nanoscale polarization fluctuations in a SBN-61 single crystal 07.10.2014 10:00
Sebastian Loth Controlling magnetism in atomically engineered nanostructures 02.10.2014 10:00
Jörn Bonse Femtosecond laser-induced periodic surface structures 19.09.2014 15:00
Thomas Frederiksen Simulations of electron transport phenomena in single-molecule junctions 16.09.2014 10:00
Prof. Alok Singh Nucleation and growth of twins during fracture of a fine grained magnesium alloy 15.09.2014 10:00
E. Z. Kurmaev X-ray spectra and electronic structure of Fe and Cu superconducting pnictides 11.09.2014 14:00
Prof. Jordi Arbiol Exploring the optical properties of nanomaterials at sub-nanometer scale with a direct correlation to its structure at atomic scale 11.09.2014 11:00
Jiří J. Mareš The Concept of Temperature – Critical Analysis 10.09.2014 14:00
Ron Jansen Silicon spintronics 08.09.2014 10:00
Martin Veis Magneto-optical spectroscopy and ellipsometry of nanostructures 28.07.2014 10:00
M. I. Tsindlekht DC and AC Magnetic Properties of the Thin Walled Superconducting Niobium Cylinder 24.07.2014 14:00
Prof. Jeffrey McCord Magnetic materials as seen by magneto-optics 21.07.2014 10:00
Martin Eckstein Nonequilibrium control of the magnetic exchange interaction 17.07.2014 14:00
Prof. Robert L. Byer LASERs at Stanford: from the Laboratory to Commercial Products 08.07.2014 10:00
Prof. Juris Purans Synchrotron radiation XAFS studies of local structure with femtometer accuracy 23.06.2014 10:00
Prof. Dr. Juan Carlos Cuevas Heat-dissipation in atomic-scale junctions 10.06.2014 10:00
Dr. Thibault Derrien Ultrashort laser processing of solids. Numerical investigation of sub-wavelength optical and thermal effects in nanomaterials 05.06.2014 16:00
Zdeněk Regner Prostorové soustavy minimálních ploch 04.06.2014 10:00
Igor Bieloshapka Kompozitní katalytické materiály pro zlepšení účinnosti palivového článku s kyselinou mravenčí 03.06.2014 13:00
Prof. Siegmund Greulich-Weber Photoelectrochemical Water Splitting 02.06.2014 10:00
Lucia Nasi Transmission electron microscopy study of semiconductor nanowires and nanostructured materials 28.05.2014 10:00

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