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News
September 11, 2026
How to Assess Students Knowledge in the Age of AI
A researcher at HSE University has proposed a flowchart to help lecturers decide how to assess students who use artificial intelligence. It shows where the use of AI should be restricted and where it can be incorporated into the learning process. The article has been published in IT Professional.
September 9, 2026
‘Balkan Hospitality Opens Doors: Studying Dialects on the Verge of Extinction
You cannot study spoken dialects from books. Instead, you need to go to a village, seek out its elders, and earn the trust of local residents before you can record hours of spontaneous stories. This is how Natalia Muravleva, Associate Professor at the Faculty of Humanities, conducts her research. Her internship in Serbia continued her long-standing study of dialects spoken by Macedonian settlers. In this interview, she discusses how diaspora cultural centres help researchers reach informants, why native speakers need to be interviewed only in their own language (otherwise, as she puts it, they may 'break'), and how a single field season helped her finalise her monograph. She also shares warm memories of autumn in Belgrade and of colleagues with whom grammar can be discussed in three languages at once.
September 9, 2026
Scientists Train Neural Network to Generate Process Plans from 3D Models
Researchers at the HSE FCS AI and Digital Science Institute have developed CAD2TechSpec, a framework that converts 3D models of mechanical parts into machining process plans—step-by-step instructions for machine tools. The solution aims to reduce the time required for the design and preparation of technical process documentation in mechanical engineering, aircraft manufacturing, and other high-tech industries. The study findings have been published in PeerJ Computer Science.

 

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Лазерная генерация в дисковых микроструктурах InGaN/GaN/AlGaN на кремнии

Письма в Журнал технической физики. 2025. Т. 51. № 11. С. 41–45.
Moiseev E., Komarov S., Ivanov K., Цацульников А. Ф., Луценко Е. В., Войнилович А. Г., Сахаров А. В., Артеев Д. С., Николаев А. Е., Заварин Е. Е., Масютин Д. А., Пивоварова А. А., Ильинская Н. Д., Смирнова И. П., Марков Л. К., Zhukov A., Kryzhanovskaya N.
Research target: Physics Nanotechnologies
Language: Russian
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DOI
Text on another site
Keywords: дисковый резонатормоды шепчущей галереиIII-N микролазермикролазер на кремнии
Publication based on the results of:
Проектирование, синтез и исследование гетероструктур на основе широкозонных III-N материалов и микролазеров на основе высокодобротных резонаторов (2026)
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In this work, we combine experimental characterization and molecular dynamics (MD) simulations to elucidate the molecular mechanisms governing the impregnation of mefenamic acid (MFA) into nanocrystalline cellulose (NCC) aerogels. NCC aerogels were impregnated with MFA in scCO2, and low-temperature nitrogen adsorption revealed a concentration-dependent decrease in surface area, pore volume, and pore size, with an ...
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Using self-consistent Bogoliubov-de Gennes calculations for kagome flakes framed by armchair and flat edges, we observe a configuration-dependent spatial inhomogeneity of an 𝑠-wave superconducting condensate. Specifically, at half-filling, the local pair potential is significantly enhanced by up to 77.8% at edge centers and up to 148.9% at corners, subsequently boosting their local critical temperatures by up to 13.5% and ...
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Элементы теории топологических изоляторов
Denis K., Н. Новгород: Нижегородский государственный университет им. Н.И. Лобачевского, 2025.
В учебном пособии излагаются элементы теории и описание избранных экспериментальных результатов, полученных в активно развивающейся физике топологических изоляторов. Рассмотрены наиболее простые модели поверхностных и краевых состояний в двумерных и трёхмерных топологических изоляторах, их структура в магнитном поле, а также основы топологических методов для определения их свойств. Обсуждаются модели квантовых точек, формируемых в топологических изоляторах. Приведены ...
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Сочетанием методов МОС-гидридной эпитаксии и импульсного лазерного нанесения изготовлены гетеронаноструктуры InGaAs/GaAs со слоем (Ga, Mn)As на поверхности, и исследовано влияние воздействия импульсного эксимерного лазера (длина волны 248 nm, длительность импульса ~30 ns, плотность энергии в диапазоне 200-360 mJ/cm2) на их излучательные, структурные и гальваномагнитные свойства. При исследованиях использовалась спектроскопия фотолюминесценции, дополненная возможностью анализа поляризационных характеристик ...
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Исследована динамика туннелирования и спина для дырочных состояний в двойной квантовой точке на основе GaAs при наличии сильного спин-орбитального взаимодействия и периодического электрического поля. Рассмотрены режимы туннелирования с переворотом спина в условиях "медленной" эволюции, при которой частота поля меньше остальных энергетических параметров стационарной части гамильтониана. Обнаружено, что в таких условиях туннелирование с переворотом спина может ...
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Single-spin state evolution induced by the Landau-Zener-Stückelberg-Majorana (LZSM) interference in a Zeeman-spit four-level system in a periodically driven double quantum dot is studied theoretically by the Floquet stroboscopic method. An interplay between spin-conserving and spin-flip tunneling processes with the electric dipole spin resonance (EDSR) that is induced in an individual dot and enhanced by the ...
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The power and spectral characteristics of the radiation of a semiconductor microdisk laser with a diameter of 40 µm, monolithically integrated with an optical waveguide, have been studied. To reduce absorption in the waveguide, current pumping was used. In the light–current dependence, features associated with the onset of generation at a longer-wavelength resonance are observed. ...
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We investigate the mode composition of a microdisk laser coupled with an optical waveguide. The output spectra of emission and light-current characteristic of the microlaser obtained from the output edge of the waveguide are studied. The microlaser demonstrates single-mode emission in consecutive ranges of injection currents, that are alternated with pronounced mode hoping. The intensity ...
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Fabrication, optical study, and mode modeling of III-N microdisk resonators with InGaN/GaN quantum wells on Al2O3 are presented. It is shown that the created epitaxial structures have high optical quality, and the microresonators support high-Q whispering gallery modes. ...
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Natalia V. Kryzhanovskaya, Sergey D. Komarov, Eduard I. Moiseev et al., IEEE Photonics Technology Letters 2026 Vol. 38 No. 4 P. 243–246
III-N ring microlasers on a silicon substrate with InGaN/GaN active layers emitting near 420 nm were investigated. The growth conditions and fabrication steps were optimized to realize stable lasing under optical pumping in cavities with a diameter of 6-10 um. Chemically sensitive transmission electron microscopy images indicate that InGaN layers present in form of isolated ...
Added: November 18, 2025
Analysis of factors determining the azimuthal and radial order of lasing mode in III–V quantum dot disk microlasers
Konstantin A. Ivanov, Alexey E. Zhukov, Eduard I. Moiseev et al., Journal of Applied Physics 2025 Vol. 138 No. 10 Article 103104
Microlasers supporting whispering gallery modes attract great interest because of their potential use in photonic integrated circuits: they have size just an order of magnitude larger than their emission wavelength and exhibit good thermal and dynamic properties. It is usually assumed that in disk microlasers a whispering gallery mode of the highest azimuthal order and ...
Added: September 11, 2025
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Spectral characteristics of quantum dot (QD) microdisk lasers under spatially inhomogeneous optical excitation are investigated. By varying the position and size of the continuous wave excitation spot over the laser cavity, we demonstrate controllable selection and switching of lasing whispering gallery modes (WGMs) at room temperature. Experimental results show that shifting the excitation spot across the ...
Added: September 5, 2025
Микродисковые лазеры с вынесенной контактной площадкой мостиковой конструкции, сформированные жидкостным химическим травлением
Образцова А. А., Пивоварова А. А., Komarov S. et al., Физика и техника полупроводников 2025 Т. 59 № 1 С. 37–42
Представлен подход к созданию микролазеров с квантовыми точками на подложках GaAs с дисковым резонатором, электрическим контактом мостикового типа и опорной мезой, сформированными методом жидкостного химического травления. Мостиковая конструкция представляет собой две соединенные подвешенной золотой балкой мезаструктуры, одна из которых является, собственно, микродисковым резонатором, а вторая служит для создания вынесенного электрического контакта. Предложенный метод открывает пути ...
Added: May 26, 2025
Бимодальная генерация на модах шепчущей галереи в лазерах на основе вертикального микрорезонатора
Бабичев А. В., Makhov I., Kryzhanovskaya N. et al., Письма в Журнал технической физики 2025 Т. 51 № 5 С. 41–44
Представлены результаты исследования расщепления мод шепчущей галереи в лазерах спектрального диапазона 930-950 nm на основе вертикального микрорезонатора. Использование распределенных брэгговских отражателей на основе чередующихся слоев Al0.2Ga0.8As/Al0.9Ga0.1As, не поглощающих на длине волны накачного лазера, позволило снизить величину пороговой мощности оптической накачки до 180 μW (для 3 μm-микролазера). Добротность микрорезонатора на пороге генерации для мод шепчущей галереи ...
Added: April 30, 2025
Low-threshold surface-emitting whispering-gallery mode microlasers
Babichev A., Makhov I., Kryzhanovskaya N. et al., IEEE Journal on Selected Topics in Quantum Electronics 2025 Vol. 31 No. 2 Article 1502808
We report on microlasers based on high-quality micropillars with whispering-gallery modes lasing. The use of lowabsorbing Al0.2Ga0.8As/Al0.9Ga0.1As distributed Bragg reflectors and smooth pillar sidewalls enables whispering-gallery modes lasing by excitation and collection of emission in the pillar axis direction. Simultaneous whispering gallery modes lasing (comblike structure) is observed in the wavelength range of 930–970 nm ...
Added: January 9, 2025
Mode leakage into substrate in microdisk lasers
I.A. Melnichenko, E.I. Moiseev, K.A. Ivanov et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2024 Vol. 17 No. 3_2 P. 212–216
The propagation of whispering gallery modes of a quantum-dot injection disk laser into a GaAs substrate has been investigated experimentally and using simulation. For a 50 μm diameter microlaser with 1.5-μm-thick Al0.4Ga0.6As claddings, the intensity of the mode leaking into the substrate can be up to 10–3 of the intensity of the laser mode in ...
Added: December 23, 2024
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