Results in Physics最新文献

{"title":"Epitaxial D019-Mn3Ga thin films grown on the paramagnetic and diamagnetic MgO (111) substrate","authors":"Idris Opeyemi Olayiwola ,&nbsp;Ricardo López Antón ,&nbsp;Rocío M. Gutiérrez-Pérez ,&nbsp;Carlos R. Santillán-Rodríguez ,&nbsp;Óscar O. Solís-Canto ,&nbsp;Renee J. Sáenz-Hernández ,&nbsp;José T. Holguín-Momaca ,&nbsp;Sion F. Olive-Méndez","doi":"10.1016/j.rinp.2025.108435","DOIUrl":"10.1016/j.rinp.2025.108435","url":null,"abstract":"<div><div>50 nm-thick D0₁₉-Mn₃Ga epitaxial thin films were grown on MgO (111) substrates by rf-magnetron sputtering. Structural characterization demonstrated the single crystalline nature of the films grown at 400 and 500 °C, while those grown at 600 °C show an epitaxial mosaic-like growth together with the crystallization of the tetragonal D0₂₂ phase. The magnetic measurements evidenced the presence of diamagnetic and paramagnetic contributions due to the substrate, with the paramagnetic contribution probably due to magnetic impurities with concentration below 1 % atomic. We removed those contributions in both the magnetization-magnetic field and magnetization-temperature curves. After that correction, the magnetic loops of the D0₁₉-Mn₃Ga thin films were decomposed in antiferromagnetic and ferromagnetic components, employing the Brillouin function, the latest arising from the canting of the magnetic moment of the Mn atoms and the distortion of the kagome spin structure, of the D0₁₉ phase, at the boundaries between single crystalline domains as well as the ferrimagnetic contribution of the D0₂₂ clusters.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108435"},"PeriodicalIF":4.6,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Topological edge states and disorder robustness in one-dimensional off-diagonal mosaic lattices","authors":"Ba Phi Nguyen ,&nbsp;Kihong Kim","doi":"10.1016/j.rinp.2025.108433","DOIUrl":"10.1016/j.rinp.2025.108433","url":null,"abstract":"<div><div>We investigate topological edge states in one-dimensional off-diagonal mosaic lattices, where nearest-neighbor hopping amplitudes are modulated periodically with period <span><math><mrow><mi>κ</mi><mo>&gt;</mo><mn>1</mn></mrow></math></span>. Analytically, we demonstrate that discrete edge states emerge at energy levels <span><math><mrow><mi>E</mi><mo>=</mo><mi>ϵ</mi><mo>+</mo><mn>2</mn><mi>t</mi><mo>cos</mo><mrow><mo>(</mo><mi>π</mi><mi>i</mi><mo>/</mo><mi>κ</mi><mo>)</mo></mrow></mrow></math></span> (<span><math><mrow><mi>i</mi><mo>=</mo><mn>1</mn><mo>,</mo><mo>…</mo><mo>,</mo><mi>κ</mi><mo>−</mo><mn>1</mn></mrow></math></span>), extending the Su–Schrieffer–Heeger model to multi-band systems. Numerical simulations show that these edge states are robustly localized and display characteristic nodal structures, with their existence being strongly dictated by the specific edge arrangement of long and short bonds. We further examine their stability under off-diagonal disorder, where the hopping amplitudes <span><math><mi>β</mi></math></span> fluctuate randomly at intervals of <span><math><mi>κ</mi></math></span>. Using the inverse participation ratio as a localization measure, we show that these topological edge states remain robust over a broad range of disorder strengths. In contrast, additional <span><math><mi>β</mi></math></span>-dependent edge states that appear for <span><math><mrow><mi>κ</mi><mo>≥</mo><mn>4</mn></mrow></math></span> are fragile and vanish even under relatively weak disorder. These findings highlight a rich interplay between topology, periodic modulation, and disorder, offering insights for engineering multi-gap topological phases and their realization in synthetic quantum and photonic systems.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108433"},"PeriodicalIF":4.6,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two-dimensional full-Stokes characterization of parallel-aligned liquid crystal on silicon spatial light modulators","authors":"Adriana R. Sánchez-Montes ,&nbsp;Adrián Moya ,&nbsp;Eva M. Calzado ,&nbsp;Francisco J. Martínez-Guardiola ,&nbsp;Andrés Márquez ,&nbsp;Jorge Francés ,&nbsp;Inmaculada Pascual ,&nbsp;Augusto Beléndez","doi":"10.1016/j.rinp.2025.108429","DOIUrl":"10.1016/j.rinp.2025.108429","url":null,"abstract":"<div><div>Parallel-aligned liquid crystal on silicon (PA-LCoS) spatial light modulators (SLMs) are critical components in advanced optical systems due to their high resolution and dynamic phase control. It is well known that these devices present different limitations such as inter-pixel crosstalk, phase flicker, and spatial inhomogeneities that prevent optimal device performance. This article presents a comprehensive Stokes polarimetry-based two-dimensional (2D) characterization of a PA-LCoS SLM, detailing its operational principles, experimental setup, and a systematic analysis of key performance metrics as retardance, phase flicker, and LC-director orientation variations across the display as a function of voltage (gray level). The availability of voltage-dependent 2D maps of these three parameters is one of the main results of this paper. These findings offer valuable insights into calibration and alignment protocols, highlighting potential impacts on applications that require high polarization fidelity and accurate 2D performance.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108429"},"PeriodicalIF":4.6,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of gamma radiation on the structure, electrical, optical, and dielectric properties of PVDF-PMMA/MCTBO nanocomposites for electrochemical and optical applications","authors":"Faisal F.D. Alotaibi ,&nbsp;A. Rajeh ,&nbsp;Asmaa M. Elzayat ,&nbsp;W.M. Awad ,&nbsp;E.M. Abdelrazek","doi":"10.1016/j.rinp.2025.108442","DOIUrl":"10.1016/j.rinp.2025.108442","url":null,"abstract":"<div><div>Polymer nanocomposites (PNC) based on polymethyl methacrylate (PMMA) and polyvinylidene fluoride (PVDF) were synthesized by the casting technique, incorporating different weight percentages of multi-walled carbon nanotubes and Bismuth oxide nanoparticles (MCTBO NP). The prepared films were subjected to 100 kGy of gamma irradiation to investigate structural and functional modifications. X-ray diffraction (XRD) analysis revealed that doping with MCTBO led to a notable increase in the amorphous phase and a corresponding decrease in crystallinity. This structural transition was further supported by an increase in Urbach energy from 0.175 eV to 3.25 eV, particularly after irradiation, indicating enhanced structural disorder. Scanning electron microscopy (SEM) confirmed the uniform dispersion of nanoparticles throughout the polymer matrix, verifying successful integration of nanofillers. Optical characterization demonstrated a significant reduction in the optical band gap (indirect), which decreased from 3.87 eV to 3.18 eV upon MCTBO doping, and further to 2.36 eV after irradiation. This reduction is attributed to increased cross-linking and the introduction of localized states resulting from radiation exposure. Tauc’s plots indicated that the optical transitions in both irradiated and non-irradiated samples are of the indirect type. Moreover, the Urbach energy increased with both higher MCTBO content and gamma irradiation, reflecting greater electronic disorder. Additionally, electrical conductivity and dielectric properties were evaluated before and after irradiation. Results demonstrated enhanced dielectric constant and electrical conductivity with increasing MCTBO concentration and post-irradiation, suggesting improved charge transport characteristics. Among all samples, the PMMA/PVDF nanocomposite containing 6 wt% MCTBO exhibited the most superior performance, surpassing both the pristine blend and its non-irradiated counterpart. The enhanced structural, optical, and electrical properties highlight the potential of these irradiated nanocomposites for advanced applications in optoelectronic devices, energy storage systems, and radiation shielding materials.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108442"},"PeriodicalIF":4.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultra-sensitive flexible stretchable sensor based on bionic structure using graphene oxide and carboxylated multi-walled carbon nanotubes for wearable electronic skin","authors":"Shusong Li ,&nbsp;Shuang Shao ,&nbsp;Lei Ju ,&nbsp;Ying Pan ,&nbsp;Na Zhu ,&nbsp;Jiabin Li ,&nbsp;Jiarun Wang ,&nbsp;Ziyang Song ,&nbsp;Weiqiang Hong ,&nbsp;Jiangtao Hu ,&nbsp;Liang Wang ,&nbsp;Rongwei Shi ,&nbsp;Lupeng Lin","doi":"10.1016/j.rinp.2025.108441","DOIUrl":"10.1016/j.rinp.2025.108441","url":null,"abstract":"<div><div>Flexible stretchable sensors have recently attracted significant attention due to their great potential in detecting human joint posture and monitoring health. However, fabricating stretchable sensors that combine ultrasensitive responsiveness with fast response times over a wide strain range remains a major challenge. To address this issue, this study presents an ultrasensitive flexible stretchable sensor (FSS) based on a biomimetic structure, utilizing graphene oxide and carboxylated multi-walled carbon nanotubes as synergistic conductive sensing materials. The FSS exhibited excellent performance, including a strain gauge factor of up to 84.942, a sensing range of up to 160 %, a lower strain detection limit of 0.25 %, and rapid response and recovery times50 ms and 70 ms, respectively. Additionally, FSS is successfully applied to Morse code messaging, motion monitoring, and sitting posture recognition, highlighting its potential for wearable electronic skin applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108441"},"PeriodicalIF":4.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145110046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Generation of 6-μJ ultrafast pulses from an Er-doped laser system","authors":"Tingting Liu ,&nbsp;Mei Yang ,&nbsp;Ming Yan ,&nbsp;Zhengru Guo ,&nbsp;Qiang Hao ,&nbsp;Kun Huang ,&nbsp;Yan Dai ,&nbsp;Heping Zeng","doi":"10.1016/j.rinp.2025.108439","DOIUrl":"10.1016/j.rinp.2025.108439","url":null,"abstract":"<div><div>High-power lasers at 1.55 μm have mostly been constructed in the free-space configuration or the non-polarization-maintaining (PM) fiber structures, which significantly limits the practical deployment in widespread applications. Here, we reported a robust linear-polarized Er-doped laser system, except for the bulky grating pulse compressor. The laser system can deliver high-energy ultrashort pulses at μJ level in a wide range of programmable repetition rates from about 2.1 MHz down to 200 kHz. Specifically, a high pulse energy of 6 μJ, unprecedented in the PM fiber scheme, is achieved at 200 kHz repetition rate, yielding corresponding MW-level peak power. The beam quality is verified by an M²-value of 1.4. The presented laser system features high pulse energy, high peak power, and good beam quality, which constitutes a useful source for diverse applications such as material processing, biomedical imaging, and laser machining.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108439"},"PeriodicalIF":4.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Orbital-engineered spin asymmetry and multifunctionality in Eu-activated CaSiO3: a first-principles roadmap to optical-thermoelectric fusion","authors":"Muhammad Tayyab ,&nbsp;Faiq Umar ,&nbsp;Sikander Azam ,&nbsp;Qaiser Rafiq ,&nbsp;Rajwali Khan ,&nbsp;Muhammad Tahir Khan ,&nbsp;Vineet Tirth ,&nbsp;Ali Algahtani","doi":"10.1016/j.rinp.2025.108440","DOIUrl":"10.1016/j.rinp.2025.108440","url":null,"abstract":"<div><div>Rare-earth-doped nitride phosphors have emerged as critical materials for solid-state lighting and photonic devices due to their high thermal stability, narrow emission bandwidths, and strong absorption in the UV-blue range. In this study, we present a comprehensive density functional theory (DFT) investigation, incorporating GGA + U formalism, of pristine and Eu³⁺-doped CaAlSiN₃ with doping concentrations of 8.5 % and 17 %. The electronic structure calculations reveal that Eu doping introduces localized 4f states within the band-gap, reducing the band-gap and enabling efficient red photo luminescence (PL) through the ⁵D₀ → ⁷F₂ transition. Analysis of the spin-resolved density of states and spin density confirms the magnetic nature of Eu³⁺, with a net magnetic moment arising from the unpaired 4f⁶ electrons. Charge density, Bader analysis, and Electron Localization Function (ELF) plots demonstrate the mixed ionic-covalent bonding nature and confirm the charge transfer from Eu to the neighboring N and Al atoms, stabilizing the doped lattice. Optical properties, including the dielectric function (ε₁ and ε₂), absorption coefficient, refractive index, and reflectivity, were evaluated, revealing significant redshifts in the absorption edge and enhanced light-matter interaction in the visible spectrum upon Eu doping. These changes are consistent with experimental PL emission in the red–NIR region. The formation energy calculations confirm the thermodynamic feasibility of Eu incorporation, while elastic constant evaluation and Pugh’s ratio suggest excellent mechanical stability and ductility of both pristine and doped systems. Thermoelectric transport coefficients were evaluated using WIEN2k coupled with BoltzTraP, revealing that moderate Eu³⁺ substitution optimizes the power factor while Eu-induced disorder reduces the lattice thermal conductivity. This multi-scale theoretical analysis validates Eu-doped CaAlSiN₃ as a robust and efficient red-emitting phosphor suitable for white light-emitting diodes (WLEDs), offering predictive insights into its structure–property relationships. The study establishes a firm theoretical foundation for crystal site engineering strategies in phosphor materials for advanced optoelectronic applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108440"},"PeriodicalIF":4.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical investigation of electronic structure and thermoelectric properties of AlGa point defects in two-dimensional β-Ga2O3","authors":"Junjie Guo,&nbsp;Chunyan Song,&nbsp;Hui Liao,&nbsp;Jiaming Qi,&nbsp;Ningxuan Yang,&nbsp;Rui Wang,&nbsp;Jiuming Wang,&nbsp;Boyang Huang,&nbsp;Zihan Huang","doi":"10.1016/j.rinp.2025.108424","DOIUrl":"10.1016/j.rinp.2025.108424","url":null,"abstract":"<div><div>As a wide-bandgap semiconductor, β-Ga₂O₃ possesses excellent physical and chemical properties, such as ultra-low lattice thermal conductivity for thermoelectric applications. We investigated the electronic structure and thermoelectric properties of two-dimensional (2D) β-Ga₂O₃ with Al substitutions at four sites (surface/inner tetrahedral Ga(I) and octahedral Ga(II)) using density-functional theory (DFT) and Boltzmann transport theory. It was found that: (1) Compared to intrinsic 2D β-Ga₂O₃, the bandgap of surface tetrahedral Al-doped 2D β-Ga₂O₃ (I-2D) is reduced by 0.035 eV, and the density of states (DOS) for four distinct Al_Ga point defects in 2D β-Ga₂O₃ indicates that Al(p) orbitals contribute mainly to the valence band maximum (VBM). (2) 2D β-Ga₂O₃ with Al_Ga enhances n-type Seebeck coefficients. Especially, I-2D achieves the maximum power factor of 2.70 × 10¹⁰ W/(m·K²·s) of power factor for n-type near 0.8 eV (300 K), which is higher than the intrinsic value of 1.36 × 10¹⁰ W/(m·K²·s). (3) For n-type, Ⅰ-2D β-Ga₂O₃, the electrical conductivity is 4.66 × 10¹⁸/(Ω·m·s), at 1.0 eV and the electronic thermal conductivity (κ_e) is 1.9 × 10¹³ W/(m·K) near 0.8 eV at 300 K. The Lorenz numbers for the five 2D β-Ga₂O₃ structures all conform to the Lorenz distribution, indicating that the calculation results of thermal conductivity and electrical conductivity are accurate and reliable. (4) Type I-2D β-Ga₂O₃ achieves a peak n-type ZT_e of 1.79 at 900 K (vs. 0.96 for intrinsic). The results demonstrate that Al doping in 2D β-Ga₂O₃ optimizes thermoelectric properties for applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108424"},"PeriodicalIF":4.6,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Europium decorated magnetic nanoparticles design for identification of latent fingerprints on different surfaces applications","authors":"Israel Montoya Matos ,&nbsp;Sonia Andia Huaracha ,&nbsp;Lizbet León Félix ,&nbsp;David Pacheco Salazar ,&nbsp;Raquel Checca Huaman ,&nbsp;Juan Carlos Yacono Llanos","doi":"10.1016/j.rinp.2025.108426","DOIUrl":"10.1016/j.rinp.2025.108426","url":null,"abstract":"<div><div>The use of multifunctional nanomaterials with magnetic and luminescent properties has gained significant attention in forensic applications for latent fingerprint identification. In this study, we present a synthesis route for preparing chitosan-coated magnetite nanoparticles (MN-CH) by the coprecipitation method and functionalized with europium ions (MN-CH-Eu). These luminescent magnetic nanoparticles hold potential for the identification of latent fingerprints on different surfaces, including metal, plastic, and glass. Remarkably, structural analysis of MN-CH-Eu confirmed the retention of the magnetite crystalline structure through X-ray diffraction. Scanning electron microscopy and EDS mapping provided evidence of europium presence and its homogeneous distribution on the MN-CH surface. The interactions between chitosan and the nanoparticle core were mainly via electrostatic and hydrogen bonding, as confirmed by Fourier-transform infrared spectroscopy. Importantly, the europium-functionalized nanoparticles exhibited characteristic red photoluminescence, dominated by the hypersensitive ⁵D₀ → ⁷F₂ transition (∼612 nm), when excited under UV light. This emission was preserved due to the spatial isolation of Eu³⁺ within the chitosan matrix, which minimized quenching effects from the Fe₃O₄ core. After 24 h at room temperature, developed fingerprints appeared brown under natural light and bright green or reddish under UV illumination, depending on the excitation wavelength (notably 254 nm and 324 nm). The MN-CH-Eu nanoparticles were particularly effective on metal surfaces under both lighting conditions. These findings highlight the successful integration of luminescent and magnetic functionalities within a single nanomaterial, enhancing latent fingerprint detection through both physical adherence and optical contrast, and broadening the scope for forensic applications across various substrates and environmental conditions.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108426"},"PeriodicalIF":4.6,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vavilov-Cherenkov radiation and catastrophe theory","authors":"L. Krupa","doi":"10.1016/j.rinp.2025.108427","DOIUrl":"10.1016/j.rinp.2025.108427","url":null,"abstract":"<div><div>The problem of the Vavilov-Cherenkov radiation arising at an arbitrary motion of a charged particle in a transparent isotropic medium is studied. The generalised Tamm-Frank condition for the appearance of radiation is derived. Using the catastrophe theory, the existence of a new type of radiation, the cuspoid Vavilov-Cherenkov radiation, is predicted, which is more intense than the ordinary Vavilov-Cherenkov radiation. The condition for the appearance of this new radiation is derived. The realisation of fold catastrophe A₂ and boundary catastrophe B₂ in electromagnetic radiation have been studied in more detail in the case of the rectilinear motion of a charged particle.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108427"},"PeriodicalIF":4.6,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145110045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}