Indian Journal of Physics最新文献_第10页

Effect of laser field distribution on laser plasma-based THz emission 激光场分布对激光等离子体基太赫兹发射的影响

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2025-09-25 DOI: 10.1007/s12648-025-03816-5

Arnika Sharma, Ashish., Anuj Vijay, Krishna Gopal

引用次数: 0

Computational analysis of chalcogenide perovskites CaXS3 (X = Sn, Zr, and Hf) for photovoltaics applications 硫系钙钛矿CaXS3 （X = Sn， Zr和Hf）在光伏应用中的计算分析

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2025-09-22 DOI: 10.1007/s12648-025-03791-x

Anuj Kumar, Sarvendra Kumar, Sushil Kumar, Aditya Sharma, Vivek Kumar Nautiyal, Aman Kumar, Nazia Iram

{"title":"Computational analysis of chalcogenide perovskites CaXS3 (X = Sn, Zr, and Hf) for photovoltaics applications","authors":"Anuj Kumar, Sarvendra Kumar, Sushil Kumar, Aditya Sharma, Vivek Kumar Nautiyal, Aman Kumar, Nazia Iram","doi":"10.1007/s12648-025-03791-x","DOIUrl":"10.1007/s12648-025-03791-x","url":null,"abstract":"<div>The structural, elastic, mechanical, electrical, and magnetic characteristics of the chalcogenide perovskite CaXS3 (where X = Sn, Zr, and Hf) have been reported in this paper. We employed the Perdew-Burke-Ernzerhof generalised gradient (PBE-GGA) and TB-mBJ approximation to account for the exchange and correlation effects. Our computed lattice parameters agree well with the experimental and earlier theoretical findings. Assessing the elastic constants is critical for understanding materials’ mechanical and elastic properties. We have calculated various electronic properties to determine the electronic band gap values of CaSnS3, CaZrS3, and CaHfS3, which are 0.7911, 1.247, and 1.5420 eV, respectively. These properties include the dielectric constant (real and imaginary parts), reflectivity, refractive index, optical absorption coefficient, and energy loss. The magnetic properties confirm the nonmagnetic nature of CaSnS3, CaZrS3, and CaHfS3 chalcogenide perovskites. These materials are suitable for use in solar cells.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 2","pages":"493 - 508"},"PeriodicalIF":1.7,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147735021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Simulating the enhancement of high-speed optical fiber communication systems employing multiple-quantum well lasers through dispersion-compensating fibers 模拟利用多量子阱激光器通过色散补偿光纤增强高速光纤通信系统

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2025-09-22 DOI: 10.1007/s12648-025-03814-7

Alaa Mahmoud, Tamer Rizk, Moustafa Ahmed

{"title":"Simulating the enhancement of high-speed optical fiber communication systems employing multiple-quantum well lasers through dispersion-compensating fibers","authors":"Alaa Mahmoud, Tamer Rizk, Moustafa Ahmed","doi":"10.1007/s12648-025-03814-7","DOIUrl":"10.1007/s12648-025-03814-7","url":null,"abstract":"<div>We present a numerical modeling and simulation study on the performance of optical fiber communication systems employing a multiple-quantum-well (MQW) semiconductor laser operating at a wavelength of 1.55 μm with high bit rates ranging between 10 and 40 Gb/s. The performance of the fiber system is assessed through various measures, including the eye diagram of the received signal, the characteristic relationship between the bit error rate (BER) and received power, as well as the limitations on the maximum fiber length imposed by attenuation and dispersion at each specific bit rate. The possibility of enhancing system performance is examined by utilizing dispersion-compensating fiber (DCF) along with standard single-mode fiber (SSMF) to increase the limited length of SSMF. The results reveal that when the bit rate increases from 10 to 40 Gb/s, the dispersion-limited fiber length decreases from 35.1 to 2.6 km, respectively. The addition of DCF results in a significant increase in the transmission fiber length. This enhancement in the fiber length is remarkable at the highest bit rate of 40 Gb/s, where this length reaches 39 km. Therefore, the performance enhancement is achieved through the combined use of MQW lasers, which enable high-speed signal generation, and DCFs, which effectively extend transmission distances at high bit rates.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 2","pages":"643 - 654"},"PeriodicalIF":1.7,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147734860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Characteristics of harmonic and anharmonic spherical quantum dots modulated by structural parameters and hydrogenic impurity 结构参数和氢杂质调制的调和和非调和球形量子点特性

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2025-09-22 DOI: 10.1007/s12648-025-03781-z

Ruba mohammad Alauwaji, Hassen Dakhlaoui, Walid Belhadj, Eman Algraphy, Najla S. Al-Shameri, F. Ungan, Sake Wang

{"title":"Characteristics of harmonic and anharmonic spherical quantum dots modulated by structural parameters and hydrogenic impurity","authors":"Ruba mohammad Alauwaji, Hassen Dakhlaoui, Walid Belhadj, Eman Algraphy, Najla S. Al-Shameri, F. Ungan, Sake Wang","doi":"10.1007/s12648-025-03781-z","DOIUrl":"10.1007/s12648-025-03781-z","url":null,"abstract":"<div>In the present work, we explore the optical peculiarities of GaAs quantum dot (QD) built on harmonic and anharmonic confining potentials. Numerical results are made within parabolic band and effective mass (EM) theories. Using the well-known finite difference technique, we have computed the lowest energy levels and their probabilities. Afterwards, we have work out the amplitudes of the optical absorption coefficients (OACs) and discussed the influence of the hydrogenic impurity and confining potential’s parameters on the red or blue shifts presented by the system. Our findings prove that the optical and electronic characteristics of the structure we emphasis on can be modulated to attain a suitable optical absorption to specific needs or purposes by varying the potential’s parameters and the existence or absence of the hydrogenic impurity. The change of the potential’s parameters can generate two shapes of confining potentials (Harmonic and Anharmonic) which gives us more flexibility to tune and control the desired energy levels and per consequent to adjust and select the suitable OAC between the two lowest energy states (ground ((1s)) and first excited ((1p))).</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 2","pages":"451 - 461"},"PeriodicalIF":1.7,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147734949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Optical and thermoelectric performances of LiSrZ (Z = Sb, Bi) for energy conversion applications: DFT and Boltzmann transport theory 能量转换应用中LiSrZ （Z = Sb, Bi）的光学和热电性能：DFT和玻尔兹曼输运理论

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2025-09-21 DOI: 10.1007/s12648-025-03826-3

Aya Righi, Fatima Bendahma, Sabria Terkhi, Mohamed Mana, Abbes Labdelli, Fatiha Bessaha, Rabah Khenata, Khedidja Mechehoud, Bilel Achir

{"title":"Optical and thermoelectric performances of LiSrZ (Z = Sb, Bi) for energy conversion applications: DFT and Boltzmann transport theory","authors":"Aya Righi, Fatima Bendahma, Sabria Terkhi, Mohamed Mana, Abbes Labdelli, Fatiha Bessaha, Rabah Khenata, Khedidja Mechehoud, Bilel Achir","doi":"10.1007/s12648-025-03826-3","DOIUrl":"10.1007/s12648-025-03826-3","url":null,"abstract":"<div>Heusler alloys are a remarkable class of materials due to their mechanical robustness, low toxicity, outstanding thermoelectric performance, and excellent optoelectronic properties. This study presents a comprehensive theoretical investigation of novel d0 half-Heusler compounds, LiSrZ (Z = Sb, Bi), using GGA-PBE and mBJ-GGA approximations. The results indicate that both alloys are p-type semiconductors with band gaps ranging from 0.712 to 1.928 eV. Analysis of the elastic constants confirms their mechanical stability, anisotropic nature, and brittle character. Optically, LiSrZ alloys are transparent in the near-infrared region, while exhibiting broad absorption and reflectivity spectra in the visible and ultraviolet (UV) ranges. More specifically, LiSrSb has a higher peak absorption coefficient of approximately (138times {10}^{4}{text{cm}}^{-1}) and a maximum reflectivity of 62%, demonstrating its strong optical performance in the UV range. Furthermore, at 300 K, the electrical conductivity increases from (4.876times {10}^{17}) to (6.487times {10}^{18}{(Omega .text{m}.text{s})}^{-1}) when substituting Sb with Bi, resulting in a slight improvement in the thermoelectric figure of merit (ZT) from 0.82 to 0.83. These findings highlight the potential of LiSrZ alloys for applications in optoelectronics and sustainable energy technologies, encouraging further experimental validation.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 3","pages":"957 - 969"},"PeriodicalIF":1.7,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147754366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

On the representation-free formalism in quantum theory 论量子论中的无表征形式主义

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2025-09-20 DOI: 10.1007/s12648-025-03792-w

V. D. Efros

引用次数: 0

Investigate Bianchi type VI0 bulk viscous cosmic string model in modified f(R) theory with LVDP 用LVDP研究修正f(R)理论中的Bianchi型VI0体粘性宇宙弦模型

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2025-09-20 DOI: 10.1007/s12648-025-03803-w

Usha Kayarkar, Shailendra D. Deo

引用次数: 0

Enhancing structural and optical properties of PMMA through Zn0.1Co0.9Fe2O4 nanoparticle integration for energy applications 通过纳米粒子Zn0.1Co0.9Fe2O4集成提高PMMA的结构和光学性能，用于能源应用

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2025-09-20 DOI: 10.1007/s12648-025-03795-7

Neha Sain, P. K. Bhamu, S. K. Dewanda, Ritu, Pooja Yadav, R. K. Beniwal, Yashpal Choudhary, P. A. Alvi, B. L. Choudhary

{"title":"Enhancing structural and optical properties of PMMA through Zn0.1Co0.9Fe2O4 nanoparticle integration for energy applications","authors":"Neha Sain, P. K. Bhamu, S. K. Dewanda,  Ritu, Pooja Yadav, R. K. Beniwal, Yashpal Choudhary, P. A. Alvi, B. L. Choudhary","doi":"10.1007/s12648-025-03795-7","DOIUrl":"10.1007/s12648-025-03795-7","url":null,"abstract":"<div>The incorporation of Zn0.1Co0.9Fe2O4 nanoparticles into poly (methyl methacrylate) (PMMA) and its effects on the structural and optical properties of the resulting nanocomposite have been studied. Comprehensive analyses, including X-ray diffraction and Fourier-transform infrared spectroscopy, reveal significant alterations in the structural characteristics of PMMA due to the integration of the nanofiller, suggesting enhanced material complexity. Notably, optical parameters such as oscillator energy, refractive index, high-frequency dielectric constant, Relaxation time, Optical plasma frequency, and optical mobility were systematically evaluated across varying concentrations (1%, 2%, and 5%) of Zn0.1Co0.9Fe2O4, highlighting a marked reduction in direct optical band gap energy with increasing nanoparticle concentration. This reduction is attributed to a rise in charge carrier concentration and increased absorption in the UV Region, which enhances the optical conductivity and UV shielding properties of the PMMA/Zn0.1Co0.9Fe2O4 composites. The findings indicate that the doped materials exhibit elevated refractive indices and dielectric constants, suggesting their suitability for applications in solar coatings, energy storage devices, and optoelectronic devices. Further exploration of varying nanoparticle concentrations could yield deeper insights into the potential of PMMA-based nanocomposites across diverse fields for energy applications.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 2","pages":"525 - 539"},"PeriodicalIF":1.7,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147735032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Optical features of perovskite (AVABr)x(MA)1-xPbI3 thin films; x = 0, 0.05, 0.1, 0.15, 0.25 钙钛矿（AVABr）x(MA)1-xPbI3薄膜的光学特性X = 0, 0.05, 0.1, 0.15, 0.25

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2025-09-19 DOI: 10.1007/s12648-025-03808-5

A. M. El-naggar, Anwar Q. Alanazi, A. M. Kamal, A. M. Aldhafiri, Ghaida S. Al hisan, Ahmad A. Alsaleh, Amanullah Fatehmulla

{"title":"Optical features of perovskite (AVABr)x(MA)1-xPbI3 thin films; x = 0, 0.05, 0.1, 0.15, 0.25","authors":"A. M. El-naggar, Anwar Q. Alanazi, A. M. Kamal, A. M. Aldhafiri, Ghaida S. Al hisan, Ahmad A. Alsaleh, Amanullah Fatehmulla","doi":"10.1007/s12648-025-03808-5","DOIUrl":"10.1007/s12648-025-03808-5","url":null,"abstract":"<div>Perovskite (AVABr)x(MA)1-xPbI3 thin films were constructed utilizing the spin coating technique under an argon environment. The consequence of 5-ammonium valeric acid bromide (5-AVABr) doping ratio on the structure and microstructure of MAPbI3 film was studied using X-ray diffraction equipment. The absorbance of the samples was influenced by the amount of AVABr doping. The transmission data diminished for films containing a varying percentage of AVABr across the entire wavelength range, with the exception of films containing 25% AVABr. The optical band gap energy exhibited a maximum of 1.62 eV at 25% AVABr and a minimum of 1.58 eV at 5 and 15% AVABr concentrations. Different models were employed to find out the value of the refractive index (n) of each film. Films containing 5 and 15% AVABr resulted in an n-average of 2.98, up from 2.97 for the film with x = 0. Films containing 5 or 15% AVAI displayed higher dielectric constant values. The highest optical conductivity value is found in a film containing 25% AVABr. Films containing 5 or 15% AVABr have enhanced nonlinear optical characteristics. The films that included 15% AVABr showed the most intense photoluminescent results.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 2","pages":"769 - 778"},"PeriodicalIF":1.7,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147735053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Analysis on spherically symmetric static wormholes solutions in f(G, T) gravity f（G， T）重力作用下球对称静态虫洞解的分析

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2025-09-19 DOI: 10.1007/s12648-025-03810-x

H. Aman, Javlon Rayimbaev, M. Z. Bhatti, Z. Yousaf

{"title":"Analysis on spherically symmetric static wormholes solutions in f(G, T) gravity","authors":"H. Aman, Javlon Rayimbaev, M. Z. Bhatti, Z. Yousaf","doi":"10.1007/s12648-025-03810-x","DOIUrl":"10.1007/s12648-025-03810-x","url":null,"abstract":"<div>The extension of general relativity evidently proves the viable construction of traversable wormholes and their existence under the gravitational background. However, Einstein’s gravity does not incorporate these particular types of objects, including exotic matter forms, because of insufficient degrees of freedom. However, the stability and traversability conditions of these objects can be achieved by using alternative gravity frameworks. The main assumption is that solutions to wormholes can manifest as generic characteristics in gravitational theories when more degrees of freedom are added geometrically. Significantly, in the f(G, T) framework, we studied the wormhole solution under the influence of a spherically symmetric metric including three flat and asymptotical regions. Particularly, f(G, T) gravity theories are taken under consideration for the metric formulation, utilizing the well-known Morris-Thorne Relativistic framework model and supposing such metric functions that are time-independent. With the use of the power law f(G, T) model, i.e, (f(G,T)= alpha G^{n}+lambda T), n is power-law exponent which is taken as positive) and ((alpha) and (lambda) are constants, the derivation of the energy and pressure conditions are calculated to comply with the precise solutions of the traversable wormholes. The associations of these extra parameters involved in the study are aligned with regard to the study. Lastly, all three cases are analyzed and end up with the inclusion of exotic matter for the stable and traversable wormhole.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 2","pages":"829 - 848"},"PeriodicalIF":1.7,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147734942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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