A5072719316- Strong Light-Matter Interactions
- Diamond and Carbon-based Materials Research
- Silicon Nanostructures and Photoluminescence
- Carbon Nanotubes in Composites
- Graphene research and applications
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- High-pressure geophysics and materials
- Quantum optics and atomic interactions
- Laser-Ablation Synthesis of Nanoparticles
- Microfluidic and Bio-sensing Technologies
- Thermal properties of materials
- Nonlinear Optical Materials Studies
- Quantum and electron transport phenomena
- Quantum Dots Synthesis And Properties
- Nonlinear Photonic Systems
- Analog and Mixed-Signal Circuit Design
- Spectroscopy and Quantum Chemical Studies
- Random lasers and scattering media
- Neuroscience and Neural Engineering
- Spectroscopy Techniques in Biomedical and Chemical Research
- Neural Networks and Reservoir Computing
- Mass Spectrometry Techniques and Applications
- Evolution and Genetic Dynamics
Center for Theoretical Physics
2024
Institute for Basic Science
2022-2024
Korea University of Science and Technology
2023-2024
Institut Pascal
2017-2022
Université Clermont Auvergne
2019-2022
Centre National de la Recherche Scientifique
2017-2022
Saint Petersburg Academic University
2013-2021
Sigma Clermont
2019-2021
Universidad Blas Pascal
2020-2021
Ioffe Institute
2013-2018
Being the polymorphs of calcium carbonate (CaCO3), vaterite and calcite have attracted a great deal attention as promising biomaterials for drug delivery tissue engineering applications. Furthermore, they are important biogenic minerals, enabling living organisms to reach specific functions. In nature, monocrystals typically form self-assembled polycrystal micro- nanoparticles, also referred spherulites. Here, we demonstrate that alpine plants belonging Saxifraga genus can tailor light...
Topological defects, such as quantum vortices, determine the properties of fluids. Their study has been at center activity in solid state and BEC communities. In parallel, nontrivial behavior linear wave packets with complex phase patterns was investigated by singular optics. Here, we formation, evolution, interaction optical vortices Dirac point photonic graphene. We show that while their exact goes beyond equation requires a full account lattice properties, it can be still approximately...
The Klein paradox consists in the perfect tunneling of relativistic particles through high potential barriers. As a curious feature particle physics, it is responsible for exceptional conductive properties graphene. It was recently studied context atomic condensates and topological photonics phononics. While theory holds only normal incidence, so far angular dependence its strong variation with barrier height were not measured experimentally. In this work, we capitalize on versatility vapor...
Monodisperse carbon nanodots (MCNDs) were fabricated. The prepared MCNDs form spherical porous aggregates.
Analogue physics became very popular in recent decades. It allows simulating inaccessible physical phenomena, such as black holes, the laboratory. The first success of analogue is fact much older being due to Maxwell, who derived his equations for electromagnetic field by analogy with fluid dynamics presence vortices. Here we propose use vortices gravity. We implement an acoustic Kerr hole quantized angular momentum a Bose-Einstein condensate. show that condensate's metric equivalent Kerr's...
In crystalline nanoparticles, the Raman peak is downshifted with respect to bulk material and has asymmetric broadening. These effects are straightly related finite size of giving perspective use spectroscopy as probe. By combining dynamical matrix method (DMM) bond polarization model (BPM), we develop a new (DMM–BPM) approach for description spectra nanoparticle powders. The numerical variant this suitable small particles, whereas its analytical version simpler implement allows one obtain...
This letter calculates the contribution of electron-phonon interaction to thermoelectric effects in graphene.One considers case free standing graphene taking into account with intrinsic acoustic phonons.The temperatures considered range from liquid nitrogen room level.It has turned out that thermoelectromotive force due electron drag by phonons is determined Fermi energy sample and phonon relaxation time.The explicit temperature dependence deriving weak contrast diffusion, which directly...
We investigate the formation of a new class density-phase defects in resonantly driven 2D quantum fluid light. The system bistability allows low-density regions containing singularities confined between high-density regions. show that, 1D channels, an odd (1 or 3) even (2 4) number dark solitons form parallel to channel axis order accommodate phase constraint induced by pumps barriers. These soliton molecules are typically unstable and evolve toward stationary symmetric antisymmetric arrays...
The dark solitons observed in a large variety of nonlinear media are unstable against the modulational (snake) instabilities and can break vortex streets. This behavior has been investigated optical crystals ultra-cold atomic gases. However, deep characterization this phenomenon is still missing. In resonantly pumped two-dimensional polariton superfluid, we use an all-optical imprinting technique together with bistability system to create confined channels. Due snake instabilities, into...
Engineering of the orbital angular momentum (OAM) light due to interaction with photonic lattices reveals rich physics and motivates potential applications. We report experimental creation regularly distributed quantized vortex arrays in space by probing honeycomb hexagonal a single focused Gaussian beam. For lattice, vortices are associated Dirac points. However, we show that resulting spatial patterns strongly defined symmetry wave packet evolving not their topological properties. Our...
Impedance spectroscopy, the measurement of electrical current in response to excitation voltage at various frequencies, is a ubiquitous analytical technique, particularly device physics and biophysics. The authors apply adaptive filtering (in sense, simplest version artificial intelligence) for noise reduction time-domain impedance measurements, with outstanding results compared standard Fourier-transform techniques. This approach can be used any context, including portable biosensors. As...
We propose an optical analog of electron snake states based on artificial gauge magnetic field in a photonic graphene implemented by varying distances between cavity pillars. develop intuitive and exhaustive continuous model tight-binding approximation compare it with numerical simulations realistic structure. The allowed lateral propagation direction is shown to be strongly coupled the valley degree freedom, proposed structure may used as filter.
A simple way to investigate theoretically the Raman spectra (RS) of nonpolar nanoparticles is proposed. For this aim we substitute original lattice optical phonon eigenproblem by continuous Klein-Fock-Gordon-like equation with Dirichlet boundary conditions. This approach provides basis for description phonons in same manner how elasticity theory describes longwavelength acoustic phonons. Together reformulation bond polarization model it allows calculate RS without referring their atomistic...
We develop the theory of heat conductivity in supported graphene, accounting for coherent phonon scattering on disorder induced by an amorphous substrate. derive spectra in-plane and out-of-plane phonons framework Green's function approach. The energetic parameters are obtained using molecular dynamics simulations graphene SiO$_2$ is calculated Boltzmann transport equation. find that interaction with substrate drastically reduces lifetime completely suppresses contribution ZA to...
Disorder-induced broadening of optical vibrational eigenmodes in nanoparticles nonpolar crystals is studied numerically. The methods previously used to treat phonons defectless particles are adjusted for numerical evaluation the disordered problem. Imperfections form Gaussian and binary disorders as well surface irregularities investigated thoroughly a wide range impurity concentrations disorder strengths. For dilute weak point-like impurities regimes separated overlapped phonon levels...