Fyzikální ústav Akademie věd ČR

Semináře

Jahn-Teller phonons inducing ferroelectricity in GaV4S8

Úterý, 14.06.2016 10:30 - 11:30

Jiri Hlinka (Oddělení dielektrik )

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.

Více >>

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

Úterý, 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].

Více >>

Optical trapping of silica nanoparticles in air

Čtvrtek, 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.

Více >>

Spin Seebeck effect in Fe3O4 heterostructures

Čtvrtek, 16.06.2016 14:00

Alberto Anadon (Universidad de Zaragoza, Spain)

The interaction between heat and spin currents has been a very active field of study and highly boosted recently since the discovery of the spin Seebeck effect (SSE). The mechanism and control of spin injection, detection and, in general, the optimization of SSE signal is still in progress.

Více >>

Minulé semináře
Vilgelmina Stepkova Second Quantization of Mixed States of Luminophore Molecule and Small metal particle 27.10.2009 10:00
Wojciech Kuczynski Behaviour of helical structure in some chiral smectic C* liquid crystals 15.10.2009 10:00
Martin Žonda Phase transitions in the three-dimensional Falicov-Kimball model 29.09.2009 15:00
Simonas Grecius Simultaneous permittivity and permeability measurements of multiferroics using coaxial line techniques 22.09.2009 10:00
Dr. Dieter van den Bleeken, Rutgers Univ. (USA) Counting multicenter BPS states in N=2 supergravity 14.09.2009 14:30
Patrick Bruno, European Synchrotron Radiation Facility, Grenoble, France Exchange interactions in magnetic systems: From bulk through multilayers to nanostructures (Mach Medal Lecture) 09.09.2009 15:00
Ausrine Bartasyte Raman spectroscopy and X-ray diffraction studies of oxide thin films 23.07.2009 10:00
Samuel Margueron Raman spectroscopy of GaN quantum dots and GaN/sapphire circular pillars 21.07.2009 10:00
Nina Podoliak Theoretical modelling of ferromagnetic nanomaterials based on liquid crystals 04.06.2009 10:00
Jean-François Legrand Onset of the -relaxation in LiCl-6H2O by Brillouin scattering techniques 07.05.2009 10:00
Marina Tyunina Relaxor Ferroelectric Thin Films 05.05.2009 10:00
Paweł Perkowski The analysis of methods for elimination of high frequency dielectric losses in ITO cells 30.04.2009 10:00
Hiroko Yokota Polar state and critical behavior in quantum relaxor Li doped KTaO3 17.04.2009 09:00
Yoshiaki Uesu Peculiar physical properties of ferroelectric superlattice thin films 16.04.2009 15:00
Lubor Lejček Pozoruhodný svět topologických poruch 17.03.2009 10:00
Databáze minulých seminářů (1995-2009) 01.01.2008 00:03

Copyright © 2008-2014, Fyzikální ústav AV ČR, v. v. i.