Physica Scripta最新文献_第2页

Optimizing 20 Gbps of ground-to-satellite free-space optical communication in low earth orbit with hybrid wavelength-mode division multiplexing 利用混合波长模式分复用优化低地球轨道上 20 Gbps 的地对卫星自由空间光通信

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad78c4

Lina Marlina, Shofuro Afifah, Shien-Kuei Liaw, Pei-Jun Lee and Hiroki Kishikawa

引用次数: 0

Defect-induced localization of information scrambling in 1D Kitaev model 一维基塔耶夫模型中缺陷诱导的信息扰乱定位

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad7911

Varadharajan Muruganandam, Manas Sajjan and Sabre Kais

引用次数: 0

Static, cylindrically symmetric spacetime in the coincident f(Q) gravity 重合 f(Q) 引力下的静态圆柱对称时空

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad7995

Pınar Kirezli and Nilhan Özceylan

引用次数: 0

Luminescence and dielectric investigations of crystalline niobate nanoceramics prepared through aqueous chemical process 通过水化学工艺制备的结晶铌酸盐纳米陶瓷的发光和介电研究

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad7999

Kakali Sarkar and Vivek Kumar

{"title":"Luminescence and dielectric investigations of crystalline niobate nanoceramics prepared through aqueous chemical process","authors":"Kakali Sarkar and Vivek Kumar","doi":"10.1088/1402-4896/ad7999","DOIUrl":"https://doi.org/10.1088/1402-4896/ad7999","url":null,"abstract":"The present study reflects the synthesis of MgNb2O6 using hydrofluoric acid via a wet chemical approach, followed by characterizations involving XRD, electron microscopy, Raman spectroscopy, optical analyses, and impedance spectroscopy. The crystallite size of the synthesized material was determined to be 44 nm through XRD analysis. The lattice parameters of MgNb2O6 a, b, and c, were found to be 14.1998 Å, 5.6844 Å, and 4.9813 Å, respectively. Raman spectroscopy identified molecular bonds ranging from 253 to 1011 cm−1, mainly indicating the presence of metal oxide bonds. EDX spectra confirmed the presence of Mg, Nb, and O atoms in the prepared ceramics, indicating phase purity. FESEM analysis revealed a grain size of approximately 48 nm, with the presence of agglomerated grains. Bright spots in the SAED pattern observed by HRTEM confirmed the crystallinity of the prepared niobate materials, with the HRTEM microstructure showing a particle size near 49 nm. The crystallite size by XRD, grain size by FESEM, and particle size by HRTEM are in accordance with each other. The direct band gap was determined to be approximately 2.76 eV using UV-Visible spectroscopy. Additionally, MgNb2O6 materials exhibited a broad and strong photoluminescence emission near 445 nm with excitation at 270 nm, possibly indicating the presence of radiative defects in the crystalline nanostructure. Furthermore, impedance studies conducted between 40 and 110 MHz demonstrated a decrease in the dielectric constant at higher frequencies, reaching 21.06 at 110 MHz. A low dielectric loss was also observed at 110 MHz. The moderate band gap and strong room-temperature photoluminescence in the visible range make magnesium niobates suitable for possible applications in optical devices. This investigation shows that a dielectric constant near 21 and low dielectric loss can be achieved in the high-frequency range around 110 MHz.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"17 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0

Comparative study of structural, opto-electronic properties of Cs2TiX6-based single halide double perovskite solar cells: computational and experimental approach 基于 Cs2TiX6 的单卤化物双包晶太阳能电池的结构和光电特性比较研究：计算和实验方法

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad77fc

Kunal Chakraborty, Nageswara Rao Medikondu, Prakash Babu Kanakavalli, Vinjamuri Venkata Kamesh, Sudipta Das, Mahua Gupta Choudhury and Samrat Paul

{"title":"Comparative study of structural, opto-electronic properties of Cs2TiX6-based single halide double perovskite solar cells: computational and experimental approach","authors":"Kunal Chakraborty, Nageswara Rao Medikondu, Prakash Babu Kanakavalli, Vinjamuri Venkata Kamesh, Sudipta Das, Mahua Gupta Choudhury and Samrat Paul","doi":"10.1088/1402-4896/ad77fc","DOIUrl":"https://doi.org/10.1088/1402-4896/ad77fc","url":null,"abstract":"This research work represents a comparative study of the structural, optical, and electronic properties of Cs2TiX6 single halide perovskite solar cell (PSC). The entire work has been carried out by experimental work under ambient conditions and followed by the DFT method. Absorbing material structural parameters (lattice constant, shape), and band gap energy can be easily estimated from the DFT approach which can be compared with the result of experimental work. Our study shows Cs2TiBr6 PSC has better band gap energy of 1.80 eV (numerically) and 1.82 eV (experimentally), open circuit voltage 0.58 V, short circuit current 2.55 mA cm−2 for the photovoltaic application. Also, the higher Zeta potential value of Cs2TiBr6 PSC indicates that it has better material stability and is less volatile compared to Cs2TiI6, Cs2TiCl6, and Cs2TiF6 PSCs. TEM images and the SAED pattern of the active layers show a higher degree of crystallite nature of the PSCs.On the other look, investigated PSC materials Cs2TiBr6, Cs2TiI6, Cs2TiCl6, and Cs2TiF6 have shown visible light emission edges at 358 nm, 375 nm, 363 nm, 735 nm wavelength, and the optical performance area of the Cs2TiBr6, Cs2TiI6, Cs2TiCl6, Cs2TiF6 samples is recorded up to 700 nm, 760 nm, 540 nm, and 660 nm wavelength, respectively.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"17 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0

Zn-MOF as a saturable absorber for thulium/holmium-doped fiber laser Zn-MOF 作为掺铥/掺钬光纤激光器的可饱和吸收体

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad7896

H Ahmad, J W Chiam, M Z Samion, K Thambiratnam, S Mutlu, S S Yılmaz, N Arsu and B Ortaç

引用次数: 0

A study on the synthesis of superheavy element Mc (Z = 115) using lead, bismuth and actinide targets 利用铅、铋和锕系元素靶合成超重元素麦克（Z = 115）的研究

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad77fb

V Safoora, Tinu Ann Jose and K P Santhosh

引用次数: 0

MXene-based semi-circle with a thin wire-shaped resonator wideband polarization-insensitive solar absorber 基于 MXene 的带细线形谐振器的半圆形宽带偏振不敏感太阳能吸收器

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad78c5

Khaled Aliqab, Raj Agravat, Shobhit K Patel, Naim Ben Ali, Meshari Alsharari and Ammar Armghan

{"title":"MXene-based semi-circle with a thin wire-shaped resonator wideband polarization-insensitive solar absorber","authors":"Khaled Aliqab, Raj Agravat, Shobhit K Patel, Naim Ben Ali, Meshari Alsharari and Ammar Armghan","doi":"10.1088/1402-4896/ad78c5","DOIUrl":"https://doi.org/10.1088/1402-4896/ad78c5","url":null,"abstract":"Fossil fuels’ supply peaks, decreases, and shortages are determined by their proven reserves, research, and consumption rates. With a large upfront cost, renewable and alternative energy sources are essential to solving the twin issues of energy and climate change. Solar absorbers are an excellent way to use renewable energy from the environment. This paper suggested an MXene-based semi-circle with a thin wire-shaped resonator (MSCWTWSR) solar absorber where the resonator layer consists of MXene material and Fe is used as substrate layer and the resonator has semi-circle and thin wire geometry which effectively absorbs the sun radiation with wideband. This proposed MSCWTWSR solar absorber works at 200–3000 (nm) wavelength and has more than 93% average absorption. The first band bandwidth of this MSCWTWSR solar absorber is 400 (nm), the second band is 530 (nm), and the third band is 470 (nm). This structure got more than 93% absorption in the AM 1.5 solar irradiation configuration. The structure gives in the Transverse electric (TE) field and Transverse magnetic (TM) field and the structure has polarization for insensitive. Furthermore, there is also investigated different incidence angles. A suggested article includes sections on testing for electric and magnetic intensities with a comparison table. The suggested solar absorber is employed in a distinct thermal heating application since MXene has a low thermal resistance and good thermal stability.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"4 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0

Investigation of thermally induced surface composition and morphology variation of magnetron sputtered Sb2Se3 absorber layer for thin film solar cells 用于薄膜太阳能电池的磁控溅射 Sb2Se3 吸收层的热诱导表面成分和形貌变化研究

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad7992

Ayten Cantas

{"title":"Investigation of thermally induced surface composition and morphology variation of magnetron sputtered Sb2Se3 absorber layer for thin film solar cells","authors":"Ayten Cantas","doi":"10.1088/1402-4896/ad7992","DOIUrl":"https://doi.org/10.1088/1402-4896/ad7992","url":null,"abstract":"One of the most promising semiconductor materials for the development of sustainable thin-film solar cell technology is antimony selenide (Sb2Se3). Its excellent optical and electrical properties have drawn attention lately for potential application in thin-film solar cells. In this study, Sb2Se3 films deposited using the direct current (DC) magnetron sputtering technique have been subjected to a post-annealing process without an extra selenium supply at temperatures between 150 and 450 °C. Without an extra selenium supply, the impact of post-annealing temperature on the surface composition as well as the physical properties of the fabricated films was investigated. The overall evaluations revealed that the post-annealing temperature is highly efficient in altering the physical properties of the Sb2Se3 absorber thin films. We further observed that the post-annealing process improved the crystallization and the heat treatment temperature quite affected preferential orientation. The surface morphology of films exhibited structural deformation at high post-annealing temperatures (> 350 °C). According to optical and electrical characterizations, respectively, the optical energy gap and the resistivity of Sb2Se3 films reduced with an increment in the post-annealing temperature. Based on the XPS result, the variation in temperature of post-annealing led to a change in the surface composition of the films. The findings on the growth of Sb2Se3 thin films indicate the existence of an intermediate growth temperature that permits the growth of Sb2Se3 films to be optimized. The study’s conclusions can serve as a guide to the growth of Sb2Se3 thin films with the desired crystallinity, surface morphology, and composition for thin film solar cell applications.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"10 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0

Stability and evolution of skyrmionium and skyrmions in a spherical shell 天铱和天离子在球壳中的稳定性和演化

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad7919

Jing Guo, Xin Zhang, Na Cai, Ruizhi Ren and Yan Liu

{"title":"Stability and evolution of skyrmionium and skyrmions in a spherical shell","authors":"Jing Guo, Xin Zhang, Na Cai, Ruizhi Ren and Yan Liu","doi":"10.1088/1402-4896/ad7919","DOIUrl":"https://doi.org/10.1088/1402-4896/ad7919","url":null,"abstract":"The study of magnetic structures, particularly those with curved geometries such as spherical shells, has obtained significant interest due to their potential applications in data storage, spintronics, and other advanced technologies. However, the effects of material parameters, geometric dimensions, and magnetic fields on the equilibrium and induced behaviors of skyrmions remain largely unresolved. Here, based on micromagnetic simulations, we firstly investigate the influence of spherical shell dimensions, magnetic anisotropy, exchange interaction, and Dzyaloshinskii–Moriya interaction on the magnetic states of spherical shells. We find that curvature effects become more pronounced with increasing thickness and decreasing radius, providing evidence for the role of curvature-induced DMI-like interactions in skyrmion formation. Additionally, we observe that applying a magnetic field to the spherical shell induces behaviors similar to those in disks, including the topological transition between skyrmionium and skyrmion states, the annihilation of skyrmions, and polarity reversal. Our study aims to advance the understanding of magnetic phenomena in curved geometries and contribute to the development of novel magnetic devices.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"4 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0