A5056351082- Ferroelectric and Piezoelectric Materials
- Acoustic Wave Resonator Technologies
- Multiferroics and related materials
- Microwave Dielectric Ceramics Synthesis
- Graphene research and applications
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Ferroelectric and Negative Capacitance Devices
- Rare-earth and actinide compounds
- Solid-state spectroscopy and crystallography
- Electronic and Structural Properties of Oxides
- Transition Metal Oxide Nanomaterials
- Photorefractive and Nonlinear Optics
- Dielectric materials and actuators
- Fullerene Chemistry and Applications
- Boron and Carbon Nanomaterials Research
- Magnetic and transport properties of perovskites and related materials
- Theoretical and Computational Physics
- Topological Materials and Phenomena
- Glass properties and applications
- Advanced Memory and Neural Computing
- Characterization and Applications of Magnetic Nanoparticles
- High-pressure geophysics and materials
- Liquid Crystal Research Advancements
- Advanced Sensor and Energy Harvesting Materials
Université de Picardie Jules Verne
2016-2025
Laboratoire de physique de la matière condensée
2007-2024
Kyiv National University of Construction and Architecture
2019-2024
Landau Institute for Theoretical Physics
2011-2023
Southern Federal University
2020-2021
UniLaSalle Amiens (ESIEE-Amiens)
2020-2021
Laboratoire de Physique Théorique de la Matière Condensée
2010-2019
University of Žilina
2019
ITMO University
2016
University of South Africa
2014
The quantum de Haas van Alphen (dHvA) and Shubnikov (SdH) oscillations measured in graphite were decomposed by pass-band filtering onto contributions from three different groups of carriers. We develop the two-dimensional phase analysis method which allows to identify these carriers as (i) minority holes having (2D) parabolic massive spectrum, (ii) majority electrons, also but with intermediate 2D-3D (iii) 2D Dirac-like spectrum seems be responsible for unusual strongly-correlated electronic...
The ability to synthesize VO2 in the form of single-crystalline nanobeams and nano- microcrystals uncovered a number previously unknown aspects metal−insulator transition (MIT) this oxide. In particular, several reports demonstrated that MIT can proceed through competition between two monoclinic (insulating) phases M1 M2 tetragonal (metallic) R phase under influence strain. nature such behavior has been not identified. Here we show is purely lattice-symmetry-driven. Within framework...
Abstract Paradigmatic knotted solitons, Hopfions, that are characterized by topological Hopf invariant, attract an intense attention in the diverse areas of physics ranging from high-energy physics, cosmology and astrophysics to biology, magneto- hydrodynamics condensed matter physics. Yet, while being broad interest, they remain elusive under-explored. Here we demonstrate Hopfions emerge as a basic configuration polarization field confined ferroelectric nanoparticles. Our findings establish...
Abstract Integrating ferroelectric negative capacitance (NC) into the field-effect transistor (FET) promises to break fundamental limits of power dissipation known as Boltzmann tyranny. However, realizing stable static in non-transient non-hysteretic regime remains a daunting task. The problem stems from lack understanding how origin NC due emergence domain state can be put use for implementing FET. Here we forth an ingenious design domain-based with reversible capacitance. Using dielectric...
We investigate the ferroelectric phase transition and domain formation in a periodic superlattice consisting of alternate (FE) paraelectric (PE) layers nanometric thickness. find that polarization domains formed different FE can interact with each other via PE layers. By coupling electrostatic equations those obtained by minimizing Ginzburg-Landau functional, we calculate critical temperature Tc as function FE/PE wavelength Lambda quantitatively explain recent experimental observation...
We have performed x-ray diffraction and Raman spectroscopy measurements in the temperature range of 300–873 K on a single phase epitaxially oriented BaTiO3 thin film grown by pulsed laser deposition crystal MgO substrate. The θ–2θ room asymmetric rocking curves indicate that is very weakly tetragonal with c-axis parallel to plane film. X-ray up high reveal only change slope perpendicular lattice parameter around 450 (in bulk Tc=395 K) indicating diffuse-like transition taking place. Room...
Formation of ferroelastic twin domains in vanadium dioxide (VO(2)) nanosystems can strongly affect local strain distributions, and hence couple to the strain-controlled metal-insulator transition. Here we report polarized-light optical scanning microwave microscopy studies interrelated transitions single-crystalline VO(2) quasi-two-dimensional (quasi-2D) nanoplatelets (NPls). In contrast quasi-1D nanobeams, 2D geometric frustration results emergence several possible families NPls, thus...
Abstract The tunability of electrical polarization in ferroelectrics is instrumental to their applications information-storage devices. existing ferroelectric memory cells are based on the two-level storage capacity with standard binary logics. However, latter have reached its fundamental limitations. Here we propose multibit (FMBC) utilizing ability multiaxial materials pin at a sequence multistable states. Employing catastrophe theory principles show that these states symmetry-protected...
Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT) relaxor ferroelectric ceramics exhibit enhanced energy storage and electrocaloric performances due to their excellent dielectric properties. In this study, the temperature-dependence of structural properties, as well field properties in BCZT elaborated at low-temperature hydrothermal processing are investigated. X-ray diffraction Raman spectroscopy results confirmed ferroelectric-paraelectric phase transition ceramic. At room temperature 1 kHz, constant loss...
Abstract Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 (BCZT) lead-free ceramics demonstrated excellent dielectric, ferroelectric, and piezoelectric properties at the morphotropic phase boundary (MPB). So far, to study effect of morphological changes on dielectric ferroelectric in BCZT ceramics, researchers have mostly focused influence spherical grain shape change. In this study, with rod-like grains aspect ratio about 10 were synthesized by surfactant-assisted solvothermal route. X-ray diffraction...
High-thermal stability of the recovered energy density and significant electrocaloric temperature change over a broad span in lead-free BCZT ceramic.
Spectral analysis of the Shubnikov--de Haas magnetoresistance oscillations and quantum Hall effect (QHE) measured in quasi-2D highly oriented pyrolytic graphite (HOPG) [Phys. Rev. Lett. 90, 156402 (2003)] reveals two types carriers: normal (massive) electrons with Berry phase 0 Dirac-like (massless) holes $\ensuremath{\pi}$. We demonstrate that recently reported integer- semi-integer QHEs for bilayer single-layer graphenes take place simultaneously HOPG samples.
In this paper the description of dielectric and ferroelectric properties BaTiO3 single crystals using Landau phenomenological thermodynamic potential was addressed. Our results suggest that when sixth-power free energy expansion potential, remarkably different values fourth-power coefficient, β (the coefficient Pi4 terms), are required to adequately reproduce nonlinear behavior paraelectric phase electric field induced (Eb∥[001]), respectively. contrast, eighth-power with a common set...
The novel phenomena induced by symmetry breaking at homointerfaces between ferroic variants in ferroelectric and ferroelastic materials have attracted recently much attention. Using variable temperature scanning microwave microscopy, we demonstrate the mesoscopic strain-induced metal−insulator phase transitions vicinity of domain walls semiconductive VO2 that nucleated temperatures as 10−12 °C below bulk transition, resulting formation conductive channels material. Density functional theory...
Using the tight-binding approximation we calculated magnetic susceptibility of graphene quantum dots (GQD) different geometrical shapes and sizes, smaller than length, when properties are governed by electron edge states. Two types states can be discerned: zero-energy (ZES) located exactly at Dirac point, dispersed (DES) with energy close, but not equal to zero. DES responsible for temperature independent diamagnetic response, while ZES provide dependent spin Curie paramagnetism. The...
We study electronic and optical properties of single layer phosphorene quantum dots with various shapes, sizes, edge types (including disordered edges) subjected to an external electric field normal the structure plane. Compared graphene dots, in clusters similar shape size there is a set states energies dispersed at around Fermi level. These make majority metallic enrich absorption gap low-energy peaks tunable by field. The presence level characteristic feature that independent morphology roughness.
Abstract Chirality, an intrinsic handedness, is one of the most intriguing fundamental phenomena in nature. Materials composed chiral molecules find broad applications areas ranging from nonlinear optics and spintronics to biology pharmaceuticals. However, chirality usually invariable inherent property a given material that cannot be easily changed at will. Here, we demonstrate ferroelectric nanodots support skyrmions which can controlled switched. We devise protocols for realizing control...
The design of lead-free ceramics for piezoelectric energy harvesting applications has become a hot topic. Among these materials, Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT) and BaTi0.89Sn0.11O3 (BTSn) are considered as potential candidates due to their enhanced properties. Here, the structural, electrical, properties (1 - x)Ba0.85Ca0.15Zr0.10Ti0.90O3-xBaTi0.89Sn0.11O3 (xBTSn, x = 0.2, 0.4 0.6) system investigated. A systematic study structural xBTSn samples was carried out using X-ray diffraction,...
The focus on sustainable energy sources is intensifying as they present a viable alternative to conventional fossil fuels. emergence of clean and renewable hydrogen fuel marks significant technological shift toward decarbonizing the environment. Harnessing mechanical thermal through piezoelectric pyroelectric catalysis has emerged an effective strategy for producing contributing reducing dependence carbon-based In this regard, review presents recent advances in induced by excitations,...