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Digital InGaAs/InAlAs short-period superlattices intended for 1.3-μm InP-lasers
Journal of Luminescence. 2026. Vol. 295. Article 121936.
V.I. Voitovich, I.S. Makhov, Andryushkin V. V., Kopytov P. E., Novikov I. I., Papylev D. S., Sobolev M. S., Pirogov E. V., A.M. Nadtochiy, N.V. Kryzhanovskaya, A.E. Zhukov
We report on a comparative study of the optical and structural properties of short-period superlattices (SPSLs) based on digital ternary InGaAs/InAlAs alloys and their counterparts with quaternary InGaAlAs barriers, both grown on InP substrates and emitting in the 1.3 μm wavelength range. The heterostructures were grown by molecular beam epitaxy and analyzed using photoluminescence spectroscopy in a wide temperature range (5–300 K), time-resolved hotoluminescence spectroscopy, and high-resolution X-ray diffraction. Both ternary- and quaternary-based SPSLs exhibit intense emission at room temperature with comparable peak wavelengths, integrated photoluminescence intensity, radiative recombination efficiency, and charge carrier dynamics. Structural perfection was found to be comparable in all cases as well. Meanwhile, the ternary alloys based digital SPSLs allow avoiding compositional complexity inherent to quaternary alloys. These findings confirm the potential of ternary-SPSL active regions as an easy-to-fabricate and robust alternative for 1.3 μm vertical-cavity surface-emitting lasers.
Войтович В. И., Makhov I., Мельниченко И. А. et al., Optics Letters 2026 Vol. 51 No. 17 P. 4872–4875
The influence of cavity surface passivation with SiO2 coating deposited by the plasma-enhanced chemical vapor deposition technique is investigated for injection microdisk lasers with an InGaAsN/GaAs quantum well active region. The electroluminescence spectra of the microdisk lasers with cavity diameters ranging from 12 to 32 μm with and without sidewall surface passivation were studied for a ...
Added: September 25, 2026
Бабичев А. В., Makhov I., Kryzhanovskaya N. et al., Оптика и спектроскопия 2026 Т. 134 № 3 С. 272–277
Представлены результаты по реализации генерации при повышенных температурах в лазерах с длиной волны генерации 980 nm на основе вертикального микрорезонатора с использованием непоглощающих на длине волны оптической накачки зеркал. Минимальная пороговая мощность накачки составила ~0.8 mW и соответствовала температуре 150 K. Добротность микрорезонатора, определенная на пороге генерации, превысила 13000. Максимальная рабочая температура микролазера составила 195 ...
Added: September 25, 2026
Бабичев А. В., Makhov I., Kryzhanovskaya N. et al., Письма в Журнал технической физики 2026 Т. 52 № 12 С. 40–43
Реализована одночастотная генерация при 300 K в лазерах на основе вертикального микрорезонатора. Для лазеров с полупроводниковым выводным зеркалом пороговая плотность мощности накачки составила 6.5 kW/cm2. Добротность микрорезонатора и длина волны излучения, определенные на пороге генерации, равнялись 8800 и ~ 959.8 nm. Применение конструкции микрорезонатора с гибридным выводным зеркалом позволило повысить добротность микрорезонатора (до 12 360) ...
Added: September 25, 2026
Бабичев А. В., Makhov I., Kryzhanovskaya N. et al., Письма в Журнал технической физики 2026 Т. 52 № 18 С. 30–34
Представлены результаты реализации генерации при комнатной температуре в планарных вертикальных микрорезонаторах на основе зеркал Al0.2Ga0.8As/Al0.9Ga0.1As. При 300 K пороговая плотность мощности и добротность на пороге генерации составили 11.4± 0.7 kW/cm2 и 5070± 160 соответственно. Двукратное превышение порога генерации привело к увеличению добротности микрорезонатора до 19 000. Эффективный латеральный теплоотвод подтвержден малым сдвигом энергии кванта, который составил ...
Added: September 25, 2026
Budkov Y., Kiselev M. G., Journal of Chemical Physics 2026 Vol. 165 No. 12 Article 124508
We develop a three-mode statistical-mechanical theory for a two-conformer
solute in a near-critical solvent. A compressible lattice model with
vacancies yields the Gaussian free-energy functional for a critical conserved
density, an orthogonal noncritical conserved mode, and the local conformer
fraction. Their couplings follow from packing and cohesive interactions,
rather than being introduced phenomenologically. Kawasaki transport of the
two conserved fields and ...
Added: September 24, 2026
Kryzhanovskaya N., Makhov I., Dragunova A., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2026 Vol. 19 No. 1.1 P. 98–104
The planar microcavity structure was grown using molecular-beam epitaxy.
Single-mode lasing was observed at a wavelength of 960 nm for pillars with a diameter of
15 μm. At 300 K, the lasing threshold was approximately 30 mW. Increasing the pump
power to 2.7 times the threshold power resulted in a mode energy shift of approximately
1 meV. This shift ...
Added: September 23, 2026
Zhukov A., Wang Q., Zeng Y. et al., Nano Letters 2026 Vol. 26 No. 34 P. 11565–11572
Colloidal semiconductor nanorods (NRs) are promising room-temperature single-photon sources because of their
solution processability, tunable optical properties, and intrinsically linearly polarized emission. However, simultaneously achieving high photoluminescence quantum yield (PLQY), strong polarization, and high-purity single-photon emission remains challenging in conventional binary-shell NRs due to the competing requirements of
exciton confinement and core/shell lattice−strain management. Here, we report CdSe/CdZnS gradient alloy core/shell NRs with tunable ...
Added: September 23, 2026
Andreeva S., Gavrilov A. A., Dzhikirba K. R. et al., Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 114 Article 134515
We examine plasma excitations with linear dispersion in a system of superconducting electrons in thin
NbN disks. Using frequency-domain terahertz spectroscopy, we study the evolution of plasmons up to critical
temperature Tc. The observed excitations tend to shift to the lower frequencies while temperature is increasing
and the spectral features vanish at T > Tc. We study the ...
Added: September 23, 2026
Образцова А. А., Ivanov K., Moiseev E. et al., Journal of Physics D: Applied Physics 2026 Vol. 59 No. 30 P. 305103
We demonstrate a thermo-optically tunable microlaser based on an InGaAs/GaAs quantum-dot (QD) active region employing a deformed limaçon-shaped cavity. The asymmetric geometry effectively lifts the degeneracy of high-Q whispering-gallery modes, enabling single-mode lasing. A side-mode suppression ratio exceeds 25 dB over a wide current range. Under continuous-wave electrical pumping, the device achieves a peak output power ...
Added: September 23, 2026
Budkov Y., Journal of Chemical Physics 2026 Vol. 165 No. 12 Article 124105
Exact theories of electrolyte structure must satisfy the nonlocal constraints imposed by electrostatic screening, yet these constraints are most commonly formulated only for homogeneous bulk systems and at the level of two-point correlations. Here, we develop a unified field-theoretic framework that extends them to general inhomogeneous ionic fluids and nonlinear charge correlations. Using a standard ...
Added: September 22, 2026
Боровицкая И. В., Пименов В. Н., Коршунов С. Н. et al., Перспективные материалы 2026 № 10 С. 37–54
Проведено сравнение, обобщение и систематизация механизмов эрозии и разрушения
поверхности малоактивируемых материалов, перспективных для использования в
качестве материалов вакуумной камеры термоядерных реакторов: ванадия, его сплава
V – 10 Ti – 6 Cr – 0,05 Zr – 0,1 Si и вольфрама при последовательном воздействии на
них ионных и тепловых потоков. Тепловые потоки имитировали с помощью мощного
импульсного лазерного излучения (ЛИ), создаваемого ...
Added: September 22, 2026
Iontsev M.A., Mukhin S. I., Fistul M. V., Physical Review B: Condensed Matter and Materials Physics 2016 Vol. 94 No. 17 P. 174–510
We report a theoretical study of the ac response of superconducting quantum metamaterials (SQMs), i.e., an array of qubits (two-level systems) embedded in a low-dissipative resonator. By making use of a particular example of a SQM, namely the array of charge qubits capacitively coupled to the resonator, we obtain a second-order phase transition between an ...
Added: September 22, 2026
Denis K., Dorokhin M. V., Ved M. V. et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 104 No. 12 Article 125309
The GaAs/InGaAs quantum wells with a ferromagnetic δ〈Mn〉 layer in GaAs barrier demonstrate a set of interesting spin-related phenomena originating from Mn-hole interaction. One of such phenomena is a spin-memory effect which consists of Mn spin polarization induced by interaction with vicinity spin-polarized holes generated under the exposure by short circularly polarized light pulses. Here long Mn ...
Added: September 6, 2026
Sharov V., Pavlov A., Eliseyev I. et al., Advanced Optical Materials 2025 Vol. 13 No. 30 Article e01821
Strain engineering is a powerful tool for the development of nanostructured semiconductor devices. In this work, the effect of high external elastic strain is investigated on the photoluminescence of GaN nanowires (NWs). Individual horizontal NWs are strained to bending strains up to 2.2% using an atomic force microscope (AFM) probe. Novel nanomanipulation techniques for mechanical ...
Added: November 12, 2025
Tarasevich A., Li J., Kniazeva M. et al., PRX Energy 2025 Vol. 4 No. 2 Article 023005
Metastable nonradiative centers (supertraps) are significant energy loss channels in perovskite optoelectronic devices. In their active state, supertraps induce substantial energy loss through nonradiative recombination of free charge carriers. Transitions between active (energy loss) and passive (no energy loss) states result in photoluminescence (PL) blinking on timescales from milliseconds to seconds. The presence of blinking allowed us to ...
Added: April 30, 2025
Balakirev S. V., Makhov I., Kirichenko D. V. et al., Optical Materials 2025 Vol. 163 Article 116964
We reveal a strong dependence of optical properties of InAs quantum dots (QDs) on the As/Ga flux ratio used
during the overgrowth with a low-temperature GaAs layer. Evaluating various characteristics of the photoluminescence
spectra, we determine an optimal As/Ga flux ratio which allows formation of QDs emitting at the
longest wavelengths, with the highest intensity and the largest ...
Added: April 17, 2025
P. S. Berezhnoy, Koreyev A. S., A. B. Van'kov et al., Physical Review B: Condensed Matter and Materials Physics 2024 Vol. 110 No. 23 Article 235306
Collective spin excitations were utilized to probe many-particle energies of strongly correlated quantum Hall
ferromagnets (FMs) at 1/3< ν < 1. For this purpose, experiments on inelastic light scattering and polarized
photoluminescence (PL) were performed on a MgZnO/ZnO heterostructure, containing a high-mobility two dimensional
electron system with theWigner-Seitz parameter rs ≈ 11. The dispersion of the Larmor spin exciton ...
Added: January 14, 2025
Koreyev A. S., P.S. Berezhnoy, Gorbunov A. V. et al., Physical Review B: Condensed Matter and Materials Physics 2024 Vol. 110 No. 16 Article 165417
The phase diagram of the “gas-magnetoexciton condensate” transition of an excited two-dimensional electron
system placed in a quantizing magnetic field has been constructed in the “temperature-laser excitation power
density” coordinates. Based on the experimental data, we can conclude that the condensate is a collective,
incompressible in real space, excited state of a quantum Hall insulator. ...
Added: January 10, 2025
Никитина Е. В., Соболев М. С., Пирогов Е. В. et al., Конденсированные среды и межфазные границы 2024 Т. 26 № 3 С. 490–495
Добавление нескольких процентов азота в GaP или GaPAs позволяют получить твердые растворы GaPNAs, согласованные по параметру кристаллической решетки с кремниевой подложкой в большом диапазоне значений ширины запрещенной зоны, что дает возможность получения оптоэлектронных кремниевых интегральных схем. Однако материалы с небольшой долей азота являются мало изученными из-за сложности в эпитаксиальном выращивании четверных твердых растворов с тремя ...
Added: November 24, 2024
Shalygin V. A., Makhov I., Adamov R. B. et al., Journal of Applied Physics 2024 Vol. 136 No. 19 Article 195703
Near-infrared photoluminescence spectra of the n-doped gallium arsenide epilayer under heating lateral electric field conditions are studied. The field dependences of hot electron and hole temperatures are determined from photoluminescence spectra and from solving the power balance equation using current–voltage characteristic. Polarization anisotropy of the photoluminescence radiation arising due to the anisotropy of hot electron distribution ...
Added: November 23, 2024
Бабичев А. В., Пирогов Е. В., Соболев М. С. et al., Физика и техника полупроводников 2022 Т. 56 № 10 С. 1002–1010
The results of a study of nitrogen-containing active regions based on superlattices grown on GaAs substrates are presented. Active regions based on alternating InAs and GaAsN layers were fabricated by molecular-beam epitaxy using a nitrogen plasma source. Based on the XRD analysis, the thicknesses and average composition of superlattice layers are estimated. The study of ...
Added: November 1, 2024
Anikeeva V., Болдырев Н. Ю., Семенова О. И. et al., Оптика и спектроскопия 2024 Т. 132 № 8 С. 793–799
The paper presents the results of the temperature dependences study of the luminescence spectra (3.6 – 120 K) upon excitation by 405 nm light and of the non-contact measured photoconductivity spectra (3.6 – 300 K) of a CsPbBr3 single crystal. In the low-temperature photoluminescence (PL) spectrum, in addition to the self-trapped exciton line (2.318 eV at 10 K), a rich ...
Added: October 29, 2024
Makhov I., Kryzhanovskaya N., Dragunova A. et al., Journal of Luminescence 2024 Vol. 276 Article 120819
One drawback of self-organized quantum dots is their low optical gain. The development of new shaping methods that would allow higher gain, for example, due to a higher surface density of the QD array, remains an important task to date. In the present work, arrays of quantum dots have been formed by substituting phosphorous atoms ...
Added: August 27, 2024
Klimenko G. A., A. Hasan, Yakimov B. P. et al., Journal of Luminescence 2024 Vol. 275 Article 120732
Peculiarities of photoluminescence (PL) and absorption spectra of gradient nanocrystals CdSe1-xSx colloidal solution were studied by pump and probe technique under stationary excitation of excitons by nanosecond laser pulses. The PL peaks and differential transmission peaks positions changing were revealed with the CdSe1-xSx nanocrystals composition variation. Bleaching of excitons transitions was observed for high pump ...
Added: June 20, 2024