A5063305155- Strong Light-Matter Interactions
- Quantum and electron transport phenomena
- Semiconductor Quantum Structures and Devices
- Thermal Radiation and Cooling Technologies
- Plasmonic and Surface Plasmon Research
- Quantum Dots Synthesis And Properties
- Photonic Crystals and Applications
- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Physics of Superconductivity and Magnetism
- Semiconductor Lasers and Optical Devices
- Molecular Junctions and Nanostructures
- Quantum Electrodynamics and Casimir Effect
- Chalcogenide Semiconductor Thin Films
- Surface and Thin Film Phenomena
- ZnO doping and properties
- Advanced Semiconductor Detectors and Materials
- Quantum optics and atomic interactions
- Magnetic properties of thin films
- Semiconductor materials and devices
- Advancements in Semiconductor Devices and Circuit Design
- GaN-based semiconductor devices and materials
- Social Media and Politics
- Metamaterials and Metasurfaces Applications
- Spectroscopy and Laser Applications
Osipyan Institute of Solid State Physics RAS
2014-2024
National Research University Higher School of Economics
2018-2024
Russian Academy of Sciences
2006-2018
Moscow Institute of Physics and Technology
2017
Georgi Nadjakov Institute of Solid State Physics
2013
Physico-Technical Institute
2009
University of Würzburg
1993-2007
Radiophysical Research Institute
2006
Yaroslav-the-Wise Novgorod State University
2006
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2006
Abstract Optical bound states in the continuum (BICs) provide a way to engineer very narrow resonances photonic crystals. The extended interaction time these systems is particularly promising for enhancement of nonlinear optical processes and development next generation active devices. However, achievable strength limited by purely character BICs. Here, we mix BIC crystal slab with excitons atomically thin semiconductor MoSe 2 form exciton-polaritons Rabi splitting 27 meV, exhibiting large...
The influence of quantum dot (QD) asymmetry on the emission single three-dimensionally confined biexcitons in II-VI semiconductor nanostructures has been studied by magnetophotoluminescence spectroscopy. Investigating both biexciton and single-exciton transition same QD, we obtain a unified picture impact electron-hole exchange interaction fine structure polarization properties optical transitions QDs. splitting is demonstrated to have strong derivation binding energy, which determine be...
Photonic molecules have been fabricated by coupling pairs of micrometer-sized semiconductor cavities via a narrow channel. The optical modes in these structures studied spectroscopically as function the and mode energies are compared to detailed calculations. These results provide rich picture photonic molecules.
The critical width Lc for misfit dislocation generation has been determined molecular beam epitaxy grown strained InxGa1−xAs (0.1<x≤1) quantum wells in a GaAs matrix by means of photoluminescence measurements. For the full alloy region dependence Lc(x) is good agreement with theoretical expression proposed J. W. Matthews and A. E. Blakeslee [J. Cryst. Growth 27, 118 (1974)].
The decay characteristics of excitons and biexcitons in one single semiconductor quantum dot (QD) are directly monitored using time- spatially resolved photoluminescence spectroscopy. experiments performed on a CdSe/ZnSe QD, occupied by either or two at time, allowing direct comparison between the radiative lifetime biexciton an exciton confined same QD. rather surprising result comparable recombination rates for both states is related to spatial wave function distribution spin structure...
Quasi-zero-dimensional magnetic polarons in single ${\mathrm{Cd}}_{0.93}{\mathrm{Mn}}_{0.07}{\mathrm{T}\mathrm{e}/\mathrm{C}\mathrm{d}}_{0.6}{\mathrm{Mg}}_{0.4}\mathrm{Te}$ quantum dots have been studied by photoluminescence spectroscopy. By comparing the experimental data with model calculations, energy, internal field, and volume of are obtained. Moreover, environment recombining electron hole pair causes a distinct broadening emission line $(\ensuremath{\sim}4 \mathrm{meV})$ one diluted...
Structure has been observed in the photoluminescence and photoconductivity spectra of ${\mathrm{In}}_{\mathrm{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$As/GaAs (x\ensuremath{\le}1) strained quantum wells grown by molecular-beam epitaxy onto GaAs(001)-oriented substrates. Features at energies larger than energy gap ${\mathrm{In}}_{\mathrm{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$As are interpreted as allowed excitonic transitions between electron hole subbands...
We demonstrate a method for control of the polarization emission quantum dots (QDs) embedded in an active layer planar microcavity. This involves modification electromagnetic mode structure microcavity which is achieved by fabrication chiral gammadion with partial etching upper Bragg mirror. A degree as high 81% has been demonstrated experimentally without use static magnetic field or birefringent wave plates; this full agreement theoretical simulations fabricated structure. Theoretical...
The interaction of self-assembled ${\mathrm{In}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ quantum dots with nondegenerate modes a two-dimensional photonic-crystal defect microcavity has been investigated in the weak-coupling regime. Photoluminescence intensity measurements show transition from pump rate limited regime at low excitation to cavity-controlled high excitation. We observe considerably different saturation levels for on and off resonance. An enhancement light emission by...
We present lasing in optically pumped high-Q micropillar cavity lasers with low thresholds and high β factors. The cavities diameters between 1.0 4.0μm contain a single layer of density In0.3Ga0.7As quantum dots as active region. Cavity Q factors up to 23.000 for based on less than 70 is demonstrated.
By use of homogeneously excited small mesa structures a highly uniform electron-hole plasma (EHP) is created by cw excitation ${\mathrm{In}}_{\mathrm{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$As/InP single-quantum-well (SQW) structures. Because the high homogeneity EHP in space and time we observe many-body effects band filling under very clear experimental conditions. Our luminescence measurements demonstrate subband dependence band-gap renormalization strong reduction on width SQW's.
The transmission of a pump laser resonant with the lower polariton branch semiconductor microcavity is shown to be highly dependent on degree circular polarization pump. Spin anisotropy polariton-polariton interactions allows internal controlled by varying power. formation spatial patterns, spin rings high polarization, arising as result bistability, observed. A phenomenological model based effective semiclassical equations motion provides good description experimental results. Inclusion...
Lasing effects based on individual quantum dots have been investigated in optically pumped high-Q micropillar cavities. We demonstrate a lowering of the threshold pump power from off-resonance value 37 microW to 18 when an dot exciton is on-resonance with cavity mode. Photon correlation studies below and above laser confirm single influence. At resonance we observe antibunching g((2))(0) = 0.36 at low excitation, which increases 1 about 1.5 times threshold. In off-resonant case,
The authors demonstrate a prototype of an electrically injected, circularly polarized near-infrared laser based on specifically engineered chiral microcavity. Importantly, the high degree polarization emitted coherent beam is determined by chirality imprinted structure, which optical cavity with gradually doped GaAs/AlAs distributed Bragg reflector. A two-step lithographic process was used to fabricate structures, in combination electrical injectors. This device represents key step toward...
The confined optical modes in photonic dots have been studied by angle-resolved photoluminescence spectroscopy. photon no dispersion the cavity plane due to their three-dimensional confinement. emission intensity from each mode depends strongly on detection angle. From angle dependence of distribution electromagnetic field dot can be obtained. experimental findings are good agreement with theoretical calculations.
Statistical fluctuations of the magnetization are measured on nanometer scale. As experimental monitor we use characteristic photoluminescence signal a single electron-hole pair confined in one magnetic semiconductor quantum dot, which sensitively depends alignment ion spins. Quantitative access to statistical is obtained by analyzing linewidth broadening dot emission. Our all-optical technique allows us address moment only approximately equal 100 micro(B) and resolve changes order few micro(B).
Polariton-polariton scattering has been measured in a GaAs-based microcavity by c.w. polarized photoluminescence technique using circularly and elliptically resonant excitation into the lower polariton (LP) branch. The found to be strongly enhanced when singlet biexciton state is allowed as an intermediate one, i.e., under excitation. An exponential growth of $k=0$ LP emission achieved at high densities for major spin population leading polarization degree higher than that effect indicates...
The photoluminescence (PL) and excitation (PLE) spectra of ${\mathrm{In}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As quantum-well wires (QWW's) with wire widths ${\mathit{L}}_{\mathit{x}}$ between 10 nm 1 \ensuremath{\mu}m have been found to demonstrate a strong linear polarization parallel the wires. is proportional 1/${\mathit{L}}_{\mathit{x}}$ for broad saturates in case narrow at level 20--60 % depending on QWW structure design. This effect PL band-edge PLE...
Photoluminescence studies on InGaAs/GaAs quantum dots with diameters down to 20 nm have been performed in magnetic fields up $B\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}12$ T and compared detailed calculations. The eigenstates of these cylindrical are characterized by a radial number an azimuthal corresponding the orbital angular momentum. From distinctly different field dependences several transitions we identify electron-hole recombinations involving states 0,...
The effect of Coulomb interaction on exciton-polariton condensates in GaAs pillar microcavities with lateral size the order 10 $\ensuremath{\mu}$m has been investigated by means a nonresonant excitation various spot sizes. A local small laser shown to allow for control spatial potential lower polariton branch and manipulation condensate wave function, polarization, energy. Contributions blueshift mode resulting from interactions within those condensed polaritons photoexcited exciton...
The dynamics of the expansion first order spatial coherence g(1) for a polariton system in high-Q GaAs microcavity was investigated on basis Young's double slit experiment under 3 ps pulse excitation at conditions Bose-Einstein condensation. It found that process condensate formation expands with constant velocity about 10(8) cm/s. measured is smaller than thermal equilibrium during growth density and well exceeds it end decay. onset governed by relaxation while amplitude phase fluctuations...
The intrinsic Josephson effect is observed in a two-component polariton condensate strained planar microcavity under resonant pulsed excitation such that only one of the two linearly polarized eigenstates pumped from outside. On reaching threshold density, polariton-polariton interaction involves spontaneous breaking symmetry between spin-up and spin-down polaritons. As result, acquires nearly circular polarization while pump strong then passes to oscillation regime since weakens.
We demonstrate experimentally an unusual behavior of the parametric polariton scattering in semiconductor microcavity under a strong cw resonant excitation. The maximum scattered signal above threshold stimulated does not shift along lower branch with change pump detuning or angle incidence but is stuck around normal direction. show theoretically that such can be modelled numerically by system Maxwell and nonlinear Schroedinger equations for cavity polaritons explained via competition...
Sharp transformations of polariton-polariton scattering patterns in a semiconductor microcavity with an increase pump intensity are observed. These manifestations nonequilibrium first-order phase transitions strongly driven multimode Bose system. The effect arises from the interplay between bistability pumped polariton mode and parametric instability nonlinear