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
Soumyadeep Misra Radial junction architecture: a new approach for stable and highly efficient silicon thin film solar cells 14.07.2015 10:00
M. Moro Engineering spin structures at the atomic scale 09.07.2015 15:00
Dr. Lars-Oliver Kautschor Extending Synchrotron X-ray Microscopy to the Laboratory - X-Ray Microscopy as a correlative imaging technique 09.07.2015 14:00
Alan D. Bristow Coherent Spectroscopy for Quantum Control of Matter 07.07.2015 10:00
V.P. Zhukov Modeling of propagation of bi-chromatic laser pulse in transparent solids: Preliminary concept 02.07.2015 14:30
Martin Friák Multi-scale modeling of hierarchical biocomposites 30.06.2015 15:00
Leonid Glebov Volume Holographic Elements for Spectroscopy and High-Power Laser Applications 26.06.2015 10:00
Urko Petralanda Holguin Structural instabilities and sequence of phase transitions in SBN and SBT from first principles and Monte Carlo simulations 23.06.2015 15:00
Dr. Pavel Staroba Measurement of properties of W a Z bosons at LHC + information about conference CIPANP 2015 18.06.2015 13:30
Václav Drchal Angle-resolved photoemission spectra of Heusler alloys: Ni2MnGa as a case study 16.06.2015 15:00
Kirill Belashchenko Effects of thermal spin fluctuations on the electronic properties of itinerant magnets: Surprises from ab initio calculations 09.06.2015 15:00
Elena Buixaderas / Urko Petralanda Metastable ferroelectric states in antiferroelectric PZT ceramics (EB); Phase transtion mechanism of SBT and SBN (UP) 09.06.2015 14:00
Joachim Reichert Single-Molecule Junctions in Strong Optical Fields 09.06.2015 10:00
Vladimir Stephanovich Thermodynamics of magnetically ordered and disordered systems 04.06.2015 14:00
Prof. B. Dabrowski Search for Displacive-type Multiferroics with a Huge Magnetoelectric Coupling 02.06.2015 10:00
Karel Král, Miroslav Menšík Energy and Charge Transfer between Quasi-zero-dimensional Nanostructures 26.05.2015 15:00
Marek Pasciak Finite temperature phonon spectra in perovskites from atomistic simulations 26.05.2015 10:00
Iván Brihuega Visualizing and manipulating graphene physics at the atomic scale 21.05.2015 15:00
R. Cimrman, M. Novák, and J. Vackář Isogeometric analysis, environment-reflecting separable pseudopotentials and Hamiltonian rank-m updates in the evaluation of Hellman-Feynman forces 12.05.2015 15:00
Miroslav Kotrla Multiscale modeling of magnetic metals heteroepitaxial overlayers. 05.05.2015 15:00
Michal Svatoš Measurement of the isolated prompt photon + b jet cross-section in pp collisions at 8 TeV 30.04.2015 13:30
Dr. Xavier Martí From/to science to/from business 30.04.2015 10:00
Matthias Vojta Coupled-dimer magnets: Systematic expansions, quantum criticality, and disorder 28.04.2015 15:00
Bert Voigtländer Charge Transport Measurements at the Nanoscale using a Multi-Tip STM 28.04.2015 10:00
Prof. David A. Crandles The Search for Ferromagnetism in SrTiO3 28.04.2015 10:00
Prof. Shih-Jye Sun The property variations of ZnO responding to UV irradiations 27.04.2015 13:30
Prof. Hua Shu Hsu Introduction to Magnetic Circular Dichroism and its application in magnetic semiconductor 27.04.2015 13:00
Jiří Chaloupka Magnetism of layered honeycomb iridates 21.04.2015 15:00
Alexander Poddubny Surface engineering in silicon- and germanium- based nanocrystals 21.04.2015 10:00
Hendrik Vita Interaction of magnetic and non-magnetic metals with graphene 14.04.2015 15:00

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