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Department of Dielectrics

Institute of Physics of the Czech Academy of Sciences


group Dielectric and IR spectroscopy science Dielectric and IR spectroscopy group THz and pump-probe science THz science and technology group Photon and neutron scattering group Light and neutron scattering group Theory Theory and
simulations
group Solid materials science Solid-state materials science group Liquid crystal material science Liquid crystals

About us

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.

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Photo of people of Dielectrics
Our mission: Understanding the materials for which the frequency dependence of dielectric function can be probed by capacitance, waveguide or optical techniques. Experimental research in the Department of Dielectrics is mostly based on dielectric, infrared, time-domain THz, Raman and neutron spectroscopy, but also calorimetry, nonlinear optics and scanning probe microscopy measurements. The information on the core research activities organized within our six principal research groups can be accessed through the following links:

The most significant fresh scientific results of our deparment are listed in the section Highlights.

Oncoming seminars & workshops
07.12.2021 10:00, Na Slovance 2, online
Faraday law, oxidation numbers, and ionic conductivity: The role of topology
Raffaele Resta
Istituto Officina dei Materiali (CNR), Trieste, Italy
(show abstract)
workshop workshop
23.-27.5.2022, Harrachov, Czech Republic


News & Public

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10.11.2021

Jožka Holakovský has passed away

On September 28, 2021, at the age of 82, our former colleague prom. Josef Holakovský, CSc. passed away. After graduating from the Faculty of Mathematics and Physics of the Charles University in Prague as a theoretical physicist, he joined the Department of Dielectrics in 1968 and ten years later defended his dissertation "Ferroelectric and Antiferroelectric Phase Transition of the Order Type in Mixed Crystals", submitted in 1973).

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05.11.2021 Research

Picosecond nonlinear optoelectronics in graphene

Petr Kužel and Vaisakh Chelod Paingad in collaboration with colleagues from the Charles University described nonlinear behavior of charge carriers during early times after pulsed optical excitation in epitaxially grown graphene layers. The time evolution of the system is determined by nonlinear electronic response of graphene, which opens the possibility of the increase of the speed of optoelectronic elements [Adv. Funct. Mater. 31, 2105763 (2021)].

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18.10.2021 Award

Second place for Pavel Baláž in Photogenic Science Competition 2021

A photo of (un)usual window cleaning during home office brought the second place to Pavel Baláž in the category of ‘Scientists and Home Office’. The competition is organized by the Czech Academy of Sciences and by the association Science is Alive! (Věda žije! in Czech) and its aim is to promote science by intriguing photos taken by scientists.

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30.09.2021 Award

Karel Tesař took the 2nd place in the Falling Walls Lab competition

Karel Tesař was awarded for 'breaking the wall' with his project 'Post sternotomy chest pain' at Falling Walls Lab Wroclaw on 29 September 2021.

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16.04.2021 Research

Subterahertz collective dynamics of polar vortices

An artist take on the 'whirling' vibrational mode revealed in the polar vortex structure of PbTiO3/SrTiO3 superlattices [Nature 592, 376 (2021)] to highlight the front cover of the April issue of Nature.

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Latest Highlights
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New material for 5G mobile networks

Epitaxial strained thin films of (SrTiO3)n-1(BaTiO3)1SrO were found to be a promising new material for mobile network of the 5th generation [Nature Mater. 19, 176 (2020)].

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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)].

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Making EuO multiferroic by epitaxial strain engineering

Optical soft mode driven ferroelectric phase transition was discovered in IR spectra of tensile strained ferromagnetic EuO thin films [Commun. Mater. 1, 74 (2020)].

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Seemingly anisotropic magnetodielectric effect in isotropic EuTiO3 ceramics

Anisotropic magnetodielectric effect was observed at 0.3 K in the low-frequency dielectric spectra of antiferromagnetic EuTiO3 ceramics [Phys. Rev. B 102, 144402 (2020)].

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Latest Key Articles

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Q. Li, V.A. Stoica, M. Paściak, Y. Zhu, Y. Yuan, T. Yang, M.R. McCarter, S. Das, A.K. Yadav, S. Park, C. Dai, H.J. Lee, Y. Ahn, S.D. Marks, S. Yu, C. Kadlec, T. Sato, M.C. Hoffmann, M. Chollet, M.E. Kozina, S. Nelson, D. Zhu, D.A. Walko, A.M. Lindenberg, P.G. Evans, L.-Q. Chen, R. Ramesh, L.W. Martin, V. Gopalan, J.W. Freeland, J. Hlinka, and H. Wen

Subterahertz collective dynamics of polar vortices

Nature 592, 376 (2021).
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M. Hadjimichael, Y. Li, E. Zatterin, G. A. Chahine, M. Conroy, K. Moore, E. N. O’ Connell, P. Ondrejkovic, P. Marton, J. Hlinka, U. Bangert, S. Leake, and P. Zubko

Metal–ferroelectric supercrystals with periodically curved metallic layers

Nat. Mater. 20, 495 (2021).
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V. C. Paingad, J. Kunc, M. Rejhon, I. Rychetský, I. Mohelský, M. Orlita, and P. Kužel

Ultrafast plasmon thermalization in epitaxial graphene probed by time-resolved THz spectroscopy

Adv. Funct. Mater. 31, 2105763 (2021).
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L.N. Alyabyeva, A.S. Prokhorov, D.A. Vinnik, V.B. Anzin, A.G. Ahmed, A. Mikheykin, P. Bednyakov, C. Kadlec, F. Kadlec, E. de Prado, J. Prokleška, P. Proschek, S. Kamba, A.V. Pronin, M. Dressel, V.A. Abalmasov, V.V. Dremov, S. Schmid, M. Savinov, P. Lunkenheimer, and B.P. Gorshunov

Lead-substituted barium hexaferrite for tunable terahertz optoelectronics

NPG Asia Mater. 13, 63 (2021).
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N. Podoliak, M. Cigl, V. Hamplová, D. Pociecha, and V. Novotná

Multichiral liquid crystals based on terphenyl core laterally substituted by chlorine atom

J. Mol. Liq. 336, 116267 (2021).
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E. Dmochowska, J. Herman, M. Czerwiński, S. Stulov, A. Bubnov, and P. Kula

Self-assembling behaviour of chiral calamitic monoacrylates targeted for polymer stabilisation of polar smectic phases in chiral liquid crystals

J. Mol. Liq. 331, 115723 (2021).

Last update: 26 November 2021 (admin)