A5068021661- Acoustic Wave Resonator Technologies
- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Advanced Condensed Matter Physics
- Atomic and Subatomic Physics Research
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Ferroelectric and Piezoelectric Materials
- Gas Sensing Nanomaterials and Sensors
- Perovskite Materials and Applications
- Neural Networks and Applications
- Catalytic Processes in Materials Science
- Geophysics and Sensor Technology
- Mechanical and Optical Resonators
- Crystal Structures and Properties
- Quantum optics and atomic interactions
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- ZnO doping and properties
- Silicone and Siloxane Chemistry
- Physics of Superconductivity and Magnetism
- Photorefractive and Nonlinear Optics
- Seismic Waves and Analysis
- Cold Atom Physics and Bose-Einstein Condensates
University of Liège
2020-2024
Islamic Azad University, Karaj
2016
A strong driving force for charge separation and transfer in semiconductors is essential designing effective photoelectrodes solar energy conversion. While defect engineering polarization alignment can enhance this process, their potential interference within a photoelectrode remains unclear. Here we show that oxygen vacancies bismuth vanadate (BiVO
Spin reorientation and magnetization reversal are two important features of the rare-earth orthorhombic perovskites ($RM{\mathrm{O}}_{3}$) that have attracted a lot attention, though their exact microscopic origin has eluded researchers. Here, using density functional theory classical atomistic spin dynamics we build general Heisenberg magnetic model allows to explore whole phase diagram chromite ferrite compounds scrutinize mechanism responsible for reorientations reversals. We show...
We report a theoretical study of the non-linear magnetoelectric response GdFeO$_3$ through an analytical approach combined with Heisenberg model which is fitted against first-principles calculations. Our theory reproduces change polarization under applied magnetic field reported experimentally such that it allows to analyze origin large responses in different directions. show character these materials originates from fact antiferromagnetic order Gd atoms changes non-linearly respect field....
Abstract Strain engineering has been extended recently to the picosecond timescales, driving ultrafast metal–insulator phase transitions and propagation of ultrasonic demagnetization fronts. However, nonlinear lattice dynamics underpinning interfacial optoelectronic switching have not yet addressed. Here we perform time-resolved all-optical pump-probe experiments study initiated by impulsive light excitation tuned in resonance with a polar vibration LaAlO 3 single crystals, one most widely...
${\mathrm{PbZrO}}_{3}$ and ${\mathrm{CaTiO}}_{3}$ appear a priori as similar ${\mathrm{ABO}}_{3}$ oxide perovskites with very close tolerance factors. Amazingly, they show, however, significantly distinct properties: while is prototypical antiferroelectric, not. Here, we investigate the microscopic origin of their different behaviors. From comparison harmonic anharmonic interatomic force constants, highlight that key differences are in $A\text{\ensuremath{-}}\mathrm{O}$ interactions. Then,...
The observation of unexpected polarisation textures such as vortices, skyrmions and merons in various oxide heterostructures has challenged the widely accepted picture ferroelectric domain walls being Ising-like. Bloch components 180{\deg} PbTiO3 have recently been reported PbTiO3/SrTiO3 superlattices linked to wall chirality. While this opens exciting perspectives, ubiquitous nature component remains be further explored. In work, we present a comprehensive investigation superlattices,...
The observation of unexpected polarization textures such as vortices, skyrmions, and merons in various oxide heterostructures has challenged the widely accepted picture ferroelectric domain walls being Ising-like. Bloch components 180° <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi>PbTiO</a:mi></a:mrow><a:mn>3</a:mn></a:msub></a:mrow></a:math> have recently been reported <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
Resonant pumping of the electronic f-f transitions in orbital multiplet dysprosium ions (Dy^{3+}) a complex perovskite DyFeO_{3} is shown to impulsively launch THz lattice dynamics corresponding B_{2g} phonon mode, which dominanted by motion Dy^{3+} ions. The findings, supported symmetry analysis and density-functional theory calculations, not only provide novel route for highly selective excitation rare-earth crystal lattices but also establish important relationships between excitations oxides.
Lead vanadate PbVO3 is a polar crystal with P4mm space group at ambient conditions. It isostructural the model soft-mode driven ferroelectric PbTiO3, but differs from it by so-called 'supertetragonal' elongation of its unit cell. In this paper, we report combined study lattice dynamics Raman spectroscopy room temperature and first-principle calculations. All zone-center transverse optical (TO) phonon modes are identified polarized, angle-dependent assigned as follows: E 136, 269, 374 508...