Fyzikální ústav Akademie věd ČR

Seminars

Jahn-Teller phonons inducing ferroelectricity in GaV4S8

Tue, 14/06/2016 - 10:30 - 11:30

Jiri Hlinka (Department of Dielectrics )

Interesting ferromagnetic ferroelectric system permitting skyrmionic spin structure phases has also a peculiar ferroelectric transition. We shall briefly report about theoretical and experimental studies of the lattice-dynamics aspects of this phase transition.

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High-pressure behaviour of transition metal dichalcogenides MoS2, MoSe2 and MoTe2 from ab initio simulations

Tue, 14/06/2016 - 15:00 - 16:00

Roman Martoňák (Department of Experimental Physics, Comenius University in Bratislava, Mlynská dolina F2, 842 48 Bratislava, Slovakia)

Abstract: We study the evolution of structural and electronic properties of layered semiconducting transition metal dichalcogenides, MoX2 (X = S, Se, Te) upon increasing pressure, employing ab initio DFT calculations in combination with metadynamics and evolutionary search. We found that in MoS2 a layer sliding structural transition occurs at 20 GPa, converting the 2Hc stacking stable at ambient pressure to the 2Ha stacking (known in 2H-NbSe2)[1].

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Optical trapping of silica nanoparticles in air

Thu, 16/06/2016 - 10:00 - 11:00

Lukáš Ondič (Fyzikální ústav AV ČR, v.v.i.; Cikrovarnická 10; Praha 6)

Tightly focused electromagnetic radiation (an optical beam) can be used to capture a small particle without physically touching it. This technique, which has led to a Nobel prize in physics and a whole new industry in biotechnology, could allow for example to explore new physical regimes when it is combined with cooling the particle to its quantum ground state.

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Optical convertors for high average-power, high-repetition laser

Tue, 28/06/2016 - 15:00

H. Turčičová, O. Novák (Dolní Břežany)

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Past Seminars
Roland Winkler Effective Hamiltonian for edge states in graphene 02.06.2016 10:00
Roberto Lorenzi Luminescence and photonics in silica based nanomaterials 01.06.2016 13:00
Teresa Isabel Madeira Application of Photothermal Expansion for Optical Absorption Mapping of Nanostructured Semiconductor Materials 27.05.2016 10:00
Dietrich RT Zahn Spectroscopic Characterisation of Organic Thin Film Deposition and Modification 26.05.2016 15:00
Ing. Tomáš Jakoubek Lifetime, mixing and CP violation measurements in ATLAS 26.05.2016 14:00
Dr. Dennis R. Schaart FAst timing for Positron Emission Tomography 25.05.2016 13:00
Helena Reichlová Magnetization switching by spin–orbit torque in an antiferromagnet–ferromagnet bilayer system 25.05.2016 11:30
Sabine Körbel Computational materials design for photovoltaics and piezoelectrics 24.05.2016 10:00
Petr Kužel Ultrafast Terahertz spectroscopy: a tool for contactless investigation of photoconductivity in nano-scaled systems 24.05.2016 10:00
Harald Brune Realizing the Smallest Surface Adsorbed Quantum Magnets 19.05.2016 15:00
Warren E. Pickett Spin-Orbit Coupling, Strong Interactions, and Topological Character: By Design & By Serendipity 17.05.2016 15:00
E.O. Smetanina Laser-induced correlative SHG and fluorescence in a silver-containing phosphate glass under a train of femtosecond laser pulses 11.05.2016 15:00
G. Schull Optoelectronic properties of single-molecule junctions 10.05.2016 10:00
Robert A. Evarestov Electron and Phonon Properties of Perfect and Defective SrTiO3 Crystal 09.05.2016 13:00
Dr. Marcela Mikeštíková Study of the radiation hardness of strip sensors for the ATLAS Upgrade 05.05.2016 14:00
N.M. Bulgakova, I. Mirza Propagation of powerful laser pulses in atmosphere: general effects of air presence and impact on laser processing of materials 03.05.2016 15:00
Sabine Maier On-surface polymerization and self-assembly of molecular nanostructures: From metal to insulator surfaces 03.05.2016 10:00
Dr. Otokar Dragoun Searching for active and sterile neutrinos in beta-ray spectra 28.04.2016 14:00
Dr. Alberto Iorio Black holes in a pencil case 21.04.2016 14:00
L. H. Tjeng Spin-spin correlations, spin-orbit/Hund’s coupling, and metal-insulator transition in Ca2RuO4 20.04.2016 15:00
Prof. Christophe Dujardin Nanoluminescence, nanoscintillators 19.04.2016 13:00
Milan Vrabel Bioorthogonal Chemistry – Organic Chemistry on Biomolecules 19.04.2016 10:00
Peter Pikna; Hynek Němec Ultrafast processes in nanostructured and polycrystalline silicon solar cells; Conductivity mechanisms in doped SnO2 nanoparticles 19.04.2016 10:00
Gang Li Transition metal oxides topological Dirac semimetals 12.04.2016 14:00
Shohei Miyakozawa Temperature dependence of in-plane magnetic anisotropy and anisotropic magnetoresistance in (Ga,Mn)As codoped with Li 12.04.2016 10:00
Grit Köppel Nanostructures for crystalline silicon thin-film solar cells 05.04.2016 10:00
Prof. Benno Willke Observation of Gravitational Waves from a Binary Black Hole Merger 29.03.2016 16:30
Lukáš Šedivý Positron annihilation spectroscopy of defects in CdTe 23.03.2016 13:00
Jan Benedikt Cold atmospheric plasmas for material synthesis and surface treatment 23.03.2016 10:00
Luca M. Ghiringhelli Learning descriptors from materials science (big) data 22.03.2016 15:00

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