Photophysics of single LX centers in high pressure

?

Photophysics of single LX centers in high pressure–high temperature microdiamonds

Physical Review B: Condensed Matter and Materials Physics. 2025. Vol. 111. No. 15.

Нелюбов А. Ю., Tarasevich A., Павленко М. И., Екимов Е., Наумов А. В., Еремчев И. Ю.

LX centers are a recently discovered class of impurity centers in diamonds, which are characterized by nearly phononfree, spectral narrowband, and intense fluorescence at room temperature. Such a set of properties pave the way for a variety of applications, including sensing and single-photon emission. The latter requires a detailed study of photophysical processes of single emitters, which is the focus of this paper. The study of the luminescence dynamics of single LX centers in microdiamonds, synthesized by the high pressure-high temperature method, is performed by means of second-order cross-correlation function (𝑔(2)) analysis. Even though the blinking is not observed directly in the measurements, the presence of photon bunching indicates that the fluorescence of a single emitter is intermittent at microsecond scale. The three-level system that is commonly used to describe intermittency of dye molecules is not consistent with the observed power dependences. We suggest a four-level energy system model with two metastable states to describe the results and perform numerical simulations to validate the model. Finally, we discuss the four-level model in the form of fluctuations of photophysical parameters.

Research target: Physics

Non-linear in-band interference cancellation on base of conjugate gradients method

Degtyarev A., Bakhurin S., Yudin N., DSPA 2026 P. 1–6

This paper investigates one possible solution to the problem of self-interference cancellation (SIC) arising in the design of in-band full-duplex (IBFD) communication systems. Self-interference cancellation is performed in the digital domain using multilayer nonlinear models adapted via gradient-based optimization. The presence of local minima and saddle points during the adaptation of multilayer models limits the ...

Added: May 26, 2026

Ising models on the hydrogen peroxide and other lattices

Qian X., Deng Y., Shchur L. et al., Physica A: Statistical Mechanics and its Applications 2026 Vol. 696 P. 1–13

We perform a Monte Carlo analysis of the Ising model on many three-dimensional lattices. By means of finite-size scaling we obtain the critical points and determine the scaling dimensions. As expected, the critical exponents agree with the three-dimensional Ising universality class for all models. The irrelevant field, as revealed by the correction-to-scaling amplitudes, appears to ...

Added: May 24, 2026

Оптические методы детектирования единичных биомолекул: визуализация, сенсорика, секвенирование молекул ДНК

Melentiev P. N., Калмыков А. С., Гритченко А. С. et al., Успехи физических наук 2024 Т. 194 № 11 С. 1130–1145

Представлен краткий обзор достигнутого уровня оптических методов детектирования единичных молекул в биомедицинских приложениях. Показано, что регистрация флуоресценции единичных молекул красителей, ковалентно связанных с антителами (биомолекулами), совместно с использованием современных методов нанофотоники может быть применена для решения различных задач в биологии и медицине: визуализации биомолекул, токсинов, вирусных частиц, определения ультранизких концентраций аналитов напрямую во взятой пробе, ...

Added: May 21, 2026

VACUUM DISCHARGE DRIVEN BY STRIPE LINE STORAGE AS A SOURCE OF EUV RADIATION

Antsiferov P.S., Stepanov L.V., Matiukhin N. D., Review of Scientific Instruments 2025 Vol. 96 No. 12 Article 123506

The article presents the discharge plasma based source of extreme ultraviolet (EUV) radiation. The discharge circuit has been driven by means of stripe line storage with working voltage 10.5 kV. The main feature of the proposed source is that plasma electrons acquire the energy, necessary for the production of multiply charged ions with ionization potentials ...

Added: May 20, 2026

Регистрация спектров на 6.65 метровом ВУФ-УФ спектрометре с помощью многоканального детектора

Анциферов П. С., Степанов Л. В., Матюхин Н. Д., Оптика и спектроскопия 2026 Т. 134 № 2 С. 214–218

Сообщено о разработке системы регистрации спектров на ПЗС-линейке для уникального ВУФ спектрометра, построенного на основе сферической дифракционной решетки с радиусом 6.65 m. Была использована линейка HAMAMATSU S11156-2048-02, которая устанавливалась по касательной к окружности Роуланда с возможностью механического перемещения для сканирования спектра. Были получены спектрограммы в диапазоне длин волн 2130-2270 Angstrem. Описана методика сшивки регистрируемых спектральных ...

Added: May 20, 2026

ML-based Fast Simulation of FARICH Responses

Shipilov F., Barnyakov A., Ivanov A. et al., / Series Physics "arxiv.org". 2026.

A fast simulation of the detector response is a vital task in high-energy physics (HEP). Traditional Monte-Carlo methods form the backbone of modern particle physics simulation software but are computationally expensive. We present a machine-learning-based approach to fast simulation of the Focusing Aerogel Ring Imaging Cherenkov (FARICH) detector response. Given a particle track and momentum, ...

Added: May 19, 2026

On a Possible Method for Separating CO Lines from the Spectrum of the Cosmic Microwave Background

Malinovsky A. M., Пилипенко С. В., Mikhalchenko A. O. et al., Astronomy Reports 2026 Vol. 70 P. 1–6

Radiation from rotational transitions of CO molecules in distant galaxies creates a chaotic background with an intensity reaching 1000 Jy/sr at a wavelength of approximately 1 mm. This background will pose a serious problem, when measuring spectral distortions of the cosmic microwave background, in particular, the mu-distortion, which presumably has an intensity of less than ...

Added: May 19, 2026

Broadband photoluminescence of epitaxial bismuth nanowires and planar nanostructures

Kaveev A. K., Fedorov V. V., Pavlov A. V. et al., Journal of Materials Chemistry C 2026 Vol. 14 No. 7 P. 2697–2705

Bismuth nanostructures represent a promising material platform for semiconductor nanooptoelectronics and colorimetry owing to the multi-colored light reflection and quantum confinement. In this work, we study the photoluminescent properties of bismuth nanostructures grown using molecular beam epitaxy on the planar CaF2/Si(111) surface. We demonstrate the different surface morphologies of Bi, ranging from planar films obtained ...

Added: May 19, 2026

STM study of single phosphorus incorporation into silicon by heating PBr3 on Si(100)

Pavlova T., V.M. Shevlyuga (Шевлюга В. М., Applied Surface Science 2026 Vol. 736 P. 166813–166813

The objective of miniaturizing doped areas in silicon, with the ultimate goal of achieving atomic-precision doping, requires a fundamental understanding of the dopant incorporation process at the atomic level. We present a combined scanning tunneling microscopy (STM) and density functional theory (DFT) investigation of single phosphorus atom incorporation into the Si(100) surface. Phosphorus was supplied ...

Added: May 19, 2026

Single-photon diamond sources created by nature

Pasternak D., Romshin A., Khmelnitsky Р. et al., Carbon 2026 Vol. 256 Article 121655

A single-photon source (SPS) is a key component required for quantum communication devices. We report the discovery of bright diamond-based SPS created by nature. It is shown that narrow (≤2 nm) lines observed in the 500-800 nm range in photoluminescence (PL) spectra of the surface layer of untreated Yakut diamonds rich in nitrogen and hydrogen are linked to ...

Added: May 19, 2026

Optical features of nanoplatelets modified with chiral ligands

A.M. Smirnov, Kurtina D. A., Saitov S. R. et al., Optical Materials: X 2026 Vol. 30 Article 100441

Chiral semiconductor nanostructures and nanoparticles are promising materials for applications in biological sensing, enantioselective separation, photonics, and spin-polarized devices. Here we performed a detailed analysis of optical properties of chiral CdSe nanoplatelets with thickness of 2 and 3 monolayers (ML) with Nacetyl-L-cysteine ligands. We studied the absorption spectra peculiarities, analyzed time-resolved photoluminescence and investigated circular ...

Added: May 18, 2026

Temperature-driven charge transport in annealed CdSe/CdS nanoplatelets film

Saitov S. R., Saidzhonov B. M., Vasiliev R. B. et al., Journal of Applied Physics 2026 Vol. 139 No. 18 Article 185702

This work presents a comprehensive investigation into the temperature-dependent thermally stimulated conductivity and photoconductivity of vacuum-annealed thin films based on core–shell CdSe/CdS nanoplatelets passivated with oleic acid ligands. Controlled thermal annealing under vacuum conditions leads to a substantial increase in both dark and photoinduced conductivity, which is primarily attributed to partial desorption of the ligands. ...

Added: May 18, 2026

Направленность вывода излучения из кольцевых микролазеров с нарушенной вращательной симметрией

Масютин Д. А., Moiseev E., Komarov S. et al., Письма в Журнал технической физики 2026 Т. 52 № 7 С. 27–30

Исследованы инжекционные полупроводниковые микролазеры с кольцевым резонатором радиусом 15 мкм с несимметричным расположением внутреннего отверстия резонатора. Показано, что асимметрия обеспечивает формирование в диаграмме направленности двух лепестков излучения, разориентированных на 50° относительно оси смещения внутреннего отверстия. Измеренная добротность резонаторов сопоставима с добротностью дисковых резонаторов и находится на уровне ∼ 10^6. ...

Added: May 18, 2026

Plasmonic Au-Assisted g-C3N4/CeO2 Heterojunction for Enhanced Photocatalytic Breakdown of Organic Pollutants

Rathish S., Andrey S. Vasenko, Thazhathenair A. et al., The Journal of Physical Chemistry Letters 2026 Vol. 17 No. 18 P. 5386–5394

We demonstrate and rationalize the effect of Au nanoparticles (NPs) on the hierarchical g-C3N4/CeO2 heterojunction. g-C3N4/CeO2 decorated with monodispersed plasmonic Au NPs was synthesized. Detailed analyses showed that CeO2 nanocubes and monodispersed Au NPs were evenly distributed over the 2D g-C3N4 surface, forming a robust interface enriched with abundant active sites. The structure enabled efficient separation of photogenerated charge ...

Added: May 16, 2026

The origin of enhanced photocatalytic performance in titanium dioxide via niobium doping: From experimental assessments to DFT insights

Paul R., Das A., Sharma N. et al., Colloids and Surfaces A: Physicochemical and Engineering Aspects 2026 Vol. 728 Article 138830

Niobium-doped TiO2 (Nb-TiO2), demonstrates dual functionality as an efficient photocatalyst for dye degradation and a promising photoelectrocatalyst for water oxidation. Nb incorporation via a facile hydrothermal method was confirmed by XRD (Rietveld refinement), XPS, TEM, FT-IR, Raman, and BET analyses, indicating successful lattice doping and structural modification. Photocatalytic dye degradation experiments were conducted using a model ...

Added: May 16, 2026

Perturbation theory for phase correlations of a light wave propagating in a turbulent medium

I. V. Kolokolov, V. V. Lebedev, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2026 Vol. 113 No. 5 Article 054117

We theoretically investigate the correlation functions of the phase of a light wave propagating through a turbulent medium. We use an equation for the logarithm of a wave packet envelope, which includes a secondorder nonlinear term. Based on this equation, we develop a diagrammatic technique to calculate corrections to the correlation function obtained in the linear approximation. We ...

Added: May 15, 2026

Perovskite nanoparticles Cs4PbBr6 and CsPbBr3: synthesis, analysis and peculiar optical properties

Гущина В. А., / Series chemrxiv-2023-vpzhz-v2 "ChemRxiv". 2023.

All-inorganic perovskite CsPbBr3 and Cs4PbBr6 nanoparticles are being intensively studied due to their unique properties and wide range of applications; however, however, the nature of their optical properties is not yet fully understood due to the difficulty of synthesis of singlephase nanoparticles. In this article we describe the features of the synthesis of single-phase particles ...

Added: May 14, 2026

CsPbBr3 and Cs4PbBr6 perovskite nanoparticles: hidden potential of Cs4PbBr6 or ineffective fluorescence?

Гущина В. А., Mendeleev Communications 2025 Vol. 35 No. 2 P. 193–195

All-inorganic perovskite CsPbBr3 and Cs4PbBr6 nanoparticles are intensively studied for their unique optical properties, though synthesizing single-phase nanoparticles has posed challenges. Detailed synthesis method of CsPbBr3 and Cs4PbBr6 single-phase nanoparticles and their chemical and phase analysis are described. Distinctive optical characteristics, such as photoluminescence, optical band gap and the Urbach tail region, are revealed and explained within the current ...

Added: May 14, 2026

Bis(1,2,4-triphenylcyclopentadienyl) Terbium 4,4,4-trifluoro-1-phenylbutane-1,3-dionate

Daniil A. Bardonov, Minyaev M. E., Puntus L. et al., MolBank 2025 Vol. 2025 No. 4 Article M2102

A new bis(cyclopentadienyl) terbium(III) complex with 1,2,4-triphenylcyclopentadienyl and 4,4,4-trifluoro-1-phenylbutane-1,3-dionate ligands was synthesized. Single-crystal X-ray analysis revealed a mononuclear bis(cyclopentadienyl) complex with a diketonate ligand in the bisector plane. The compound under study exhibits a ligand ligand charge transfer state (LLCT), according to optical spectroscopy and crystallographic data. ...

Added: February 19, 2026

Photoinduced Tautomerisation of ESIPT-Capable Iridium(III) Complexes with Rationally Designed Acyclic Diaminocarbene Ligands

Bezzubov S., Tatarin S., Kinzhalov M. et al., Inorganic Chemistry 2026 Vol. 65 No. 3 P. 1793–1800

A series of ESIPT-capable IrIII-(acyclic diaminocarbene species) (ESIPT = Excited-state intramolecular proton transfer) exhibiting strong photoluminescence properties is described. The emission profile is strongly influenced by the nature of the azaheterocyclic fragment in the diaminocarbene ligand: pyrazine-derived species display phosphorescence bands red-shifted by approximately 100 nm compared to their pyridine analogues. This redshift is attributed ...

Added: February 17, 2026

Cyclometalated iridium(III) complexes with acyl-pyrazolone ligands – towards tunable versatile building blocks and AIE emitters with external chelating fragments

Tatarin S., Meshcheriakova E., Korshunov V. et al., Optical Materials 2026 Vol. 172 Article 117806

Development of stimuli-responsive emissive materials is of great importance, and design of transition metal complexes with varying number of external chelating fragments may contribute to this field. In this work, three bis-cyclometalated iridium complexes with 2-acyl-pyrazolone ligands in both metalated and ancillary modes were synthesized and studied by various spectroscopic techniques, single-crystal X-ray diffraction and ...

Added: February 15, 2026

New Manganese(II) Coordination Compounds with 4-((1H-Pyrrol-2-yl)methylene-amino)-4H-1,2,4-triazole

Bovkunova A., Bazhina E., Shmelev M. et al., Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya 2025 Vol. 51 No. 6 P. 472–487

The reaction of manganese(II) chloride with the azomethine ligand 4-((1H-pyrrol-2-yl)methylene-amino)-4H-1,2,4-triazole (HPyrtrz) affords crystals of 1D polymeric compound [MnII(HPyrtrz)(H2 O)Cl2]n (I). The addition of the coligand 1,10-phenanthroline (Phen) to the synthesis of compound I results in the sequential crystallization of two products: 1D polymeric compound [MnII(Phen)Cl2]n (II) and mononuclear complex [MnII(Phen)2Cl2]·HPyrtrz (III). Complex III is isolated ...

Added: February 10, 2026

New Carboxylate Anionic Sm-MOF: Synthesis, Structure and Effect of the Isomorphic Substitution of Sm3+ with Gd3+ and Tb3+ Ions on the Luminescent Properties

Ivanova A., Gontcharenko V., Lunev A. et al., Inorganics 2022 Vol. 10 No. 8 Article 104

Two new compounds, namely {(NMe2H2)}[Ln(TDA)(HCOO)] 0.5H2O, Ln = Sm3+ (Sm-TDA) and Gd3+ (Gd-TDA), where TDA3− is the anion of 1H-1,2,3-triazole-4,5-dicarboxylic acid (H3TDA), were synthesized by the solvothermal method in a DMF:H2O mixture. According to single-crystal X-ray diffraction data, the compounds are 3d-MOFs with an anionic lattice and dimethylammonium cations occupying part of the cavities. Based ...

Added: January 13, 2026

Europium Coordination Compounds for the Design of a Polyethylene-Based Luminescent Composite Material

Roitershtein D., Puntus L., Varaksina E. et al., Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya 2025 Vol. 51 No. 3 P. 218–225

The reaction of europium dibenzoylmethanate complex Na+[Eu(Dbm)4]– with 1-alkyl-4-dimethylaminopyridinium salts gives compounds [RNC5H4NMe2]+[Eu(Dbm)4]– (Dbm = [PhC(O)CHC(O)– Ph]), where R = C10H21 (I) or a set of oligomers CnH2n+1, (n is even) ([(R-NC5H4NMe2)]I) with a weightaverage molecular weight Mw = 1520 (II). The molecular structure of complex I was established by X-ray diffraction analysis (CCDC no. 2405293). Compounds I and ...

Added: November 9, 2025