|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.
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.
Open Science internships at the Institute of Physics open doors to universities worldwide
In 2018, a secondary school student, Nela Sedláčková has undertaken a one-year Open Science internship under supervision of Alexej Bubnov. At present, she is enjoying the studies of Physics at University of St Andrews supported by The Kellner Family Foundation and says: “I am convinced that the Open Science played the key role in my admittance to university in abroad”.
Silver medal for young scientists
Team of secondary school students (nicknamed NAFTA), consisting of M. Švanda (captain), T. Čajan, B. Růžičková, P. Štencl and M. Yurchenko, representing the Czech Republic in the 35th International Young Physicists Tournament was awarded a silver medal!
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)].
Ferroelectric phase transition in water molecules localized in mineral cordierite
We discovered that hydrogen bonds are eliminated and the Coulombic interactions dominate in water molecules localized in nano-channels of mineral cordierite. Their dipole moment is perpendicular to the channel axis c and our dielectric spectroscopy study have revealed their ordering at ~3 K. The critical relaxation tending to this ordering is polarized along the a-axis direction and lies in the radiofrequency range. Spontaneous polarization measurements yield the saturated value of ~3 nC/cm2 at 0.3 K [Nat. Commun. 11, 3927 (2020)].