|Dielectric and IR spectroscopy
|THz science and technology
|Light and neutron scattering
|Solid-state materials science
Main activities of Department of Dielectrics cover experimental and theoretical investigations of high-permittivity insulators like liquid crystals, ferroelectrics, multiferroics, piezoelectrics, semiconductor nanostructures, and low-loss materials.
- Dielectric and IR spectroscopy
- THz science and technology
- Light and neutron scattering
- Theory and simulations
- Solid-state materials science
- Liquid crystals
The most significant fresh scientific results of our deparment are listed in the section Highlights.
Anna Radochová won the Czech Head Award 2023 (České hlavičky) for secondary school students
Anna Radochová received this prestigious award in the category UNIVERSUM for her successful project "Properties of new photosensitive liquid crystals" under supervision of Alexej Bubnov. The ceremony will be broadcasted by the Czech Television on the 18th of November 2023.
Charged domain walls in BaTiO3 crystals emerging from superdomain boundaries
Petr Bednyakov and Jirka Hlinka observed a transient domain structure with multiple superdomains whose boundaries transform into charged domain walls in BaTiO3 [Adv. Electron. Mater. 9, 2300005 (2023)]. These superdomains highlighted the inside front cover of the June issue of Advanced Electronic Materials.
Jan Petzelt is ranked #8 in Czech Republic among Best Materials Science Scientists
According to the 2nd edition of Research.com ranking, Jan Petzelt holds the 8th place in the Czech Republic and the overall 3564th place in the Ranking of Best Scientists in the field of Materials Science 2023.
Karel Tesař received the Stanislav Hanzl award
Karel Tesař, a PhD student at the Department of Dielectrics and at the Faculty of Nuclear Sciences and Physical Engineering, won the Stanislav Hanzl award which is presented to best students of the Czech Technical University in Prague on the occasion of the International Student Day (on November 17, 2022).
Best three places in the FZU Photo Competition 2022 taken by our department
Alexey Bubnov won the
FZU Photo Competition 2022.
by his beautiful image of liquid crystal texture.
Manas Ranjan Parida received the 2nd place for his SEM image of V2O5 nanoflower,
Fedir Borodavka & Vladimir Pushkarev got the 3rd place for their artistic picture of a superlattice roll.
New Research Professor in Department of Dielectrics
We are happy to announce that Stanislav Kamba has received the Research Professor degree for his outstanding and o riginal scientific work in condensed matter physics, presented in his dissertation: Soft-mode spectroscopy of ferroelectrics and multiferroics.
Ultrafast long-distance expansion of electron-hole plasma in direct bandgap semiconductors
Transport of charge carriers inside crystals is determined by their energy band structure which only permits velocities smaller than ~c/100 in known materials. We demonstrated that ultrafast and long-distance propagation of electron-hole plasma (velocities up to c/10, reaching more than 100 μm) is possible as a quite general result of fundamental electron-photon interaction in direct bandgap semiconductors upon strong pulse photoexcitation with low photon excess energy above the bandgap [PRL 130, 226301 (2023)].
Paving the way to a 3-state thermal switch using antiferroelectric Pb(Zr1-xTix)O3
We propose a novel approach of phase-control in Pb(Zr0.95Ti0.05)O3 (PZT95/5) based on the thermal behavior of its phases. Our results show the possibility to thermally switch among three states near room temperature using small temperature gradients by heating-cooling cycles at slow rates. Thus, PZT95/5 ceramics are potential materials for room temperature device applications [Acta Materialia, 119208 (2023), online].
Application of HfO2 thin films in non-volatile memories – a review
We review main factors in preparation of HfO2 thin films and their physical properties which are important for applications in high-density resistive random access memories and ferroelectric memories [Small 18, 2107575 (2022)].
Multidomain ordered metal–ferroelectric superlattices
By combination of advanced experimental techniques and phase-field simulations, we found that electric dipoles in superlattices, composed of layers of a ferroelectric material separated by thin metallic spacers, form an unusual pattern of nanoscale domains that order in three dimensions. These ferroelectric multidomain ordered superlattices exhibit an outstanding dielectric response and their engineered modulated structural and electronic properties can be controlled using electric field [Nat. Mater. 20, 495 (2021)].
Ferroelectric and antiferroelectric phases in liquid crystalline compounds with terphenyl in the molecular coere
We designed a new type of antiferroelectric liquid crystalline structure with terphenyl in the molecular core and two lactate units attached to the chiral chain [J. Mol. Liq. 336, 116267 (2021)].