Brazilian Journal of Physics最新文献_第3页

Astroparticle Physics with TeV to PeV Ground-Based Gamma-Ray Detectors

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-03-12 DOI: 10.1007/s13538-024-01566-z

Ulisses Barres de Almeida

{"title":"Astroparticle Physics with TeV to PeV Ground-Based Gamma-Ray Detectors","authors":"Ulisses Barres de Almeida","doi":"10.1007/s13538-024-01566-z","DOIUrl":"10.1007/s13538-024-01566-z","url":null,"abstract":"<div><p>The Southern Wide-field Gamma-ray Observatory, an experiment under development since 2019 with critical Brazilian contribution and leadership, is the most recent proposal for a ground-based gamma-ray detector in the Southern Hemisphere. When fully completed, it is expected to be the most sensitive particle detector array in the world, capable of measuring gamma rays from high- to ultra-high energies from a still-unexplored region of the sky including the Galactic Center. Over half a century of developments trace the history of Astroparticle Physics in South America, since the pioneering works of Cesar Lattes, that inaugurated experimental activities, first in Brazil, and across the region as a consequence. The Cherenkov Telescope Array Observatory (CTAO) is another global facility in planning for the continent, marking the next stage in a new era of large Latin-American astroparticle experiments inaugurated 25 years ago with the Pierre Auger Observatory, in Argentina, and later followed by the High-Altitude Water-Cherenkov (HAWC) Observatory, in Mexico. This contribution will introduce some of the general context and present the latest developments and perspectives for ground-based gamma-ray astronomy in Latin America, whose history testifies and pays tribute to the work and enduring legacy of Cesar Lattes.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143602412","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

Investigation of Polaron Properties in Semiconductors Quantum Dot Under the Influence of an Oscillating Electric Radiation

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-03-11 DOI: 10.1007/s13538-025-01733-w

S. Noupeyi Domgueu, J. V. Nguepnang, C. M. Ekengoue, A. Kenfack Jiotsa

{"title":"Investigation of Polaron Properties in Semiconductors Quantum Dot Under the Influence of an Oscillating Electric Radiation","authors":"S. Noupeyi Domgueu, J. V. Nguepnang, C. M. Ekengoue, A. Kenfack Jiotsa","doi":"10.1007/s13538-025-01733-w","DOIUrl":"10.1007/s13538-025-01733-w","url":null,"abstract":"<div><p>In this paper, we investigate the influence of oscillating electric field radiation on the properties of a polaron in semiconductor quantum dot (SCQD). Using the Lee-Low-Pines-Huybrecht (LLPH) method, we derive the ground and first excited state energy of polaron. The superposition of these two energy states forms a two levels system (TLS) which is considered a quantum bit, allowing us to evaluate the probability density. The capacitance and the conductance of the SCQD are also investigated using the Drude model. Our results indicate that the electric field has pronounced effects on the properties of the polaron in SCQD. Some of these effects include, but are not limited to: (i) the variation of the probability density with respect to the x and y planar coordinates; (2i) the periodical modification of the probability density with electric field frequency, and its dependence on longitudinal optical (LO)-phonon coupling strength constant; (3i) both positive and negative values for the energy of the system, indicating the formation of free and couple polaronic entities. In particular, we found that the ground state energy of the polaron is predominant in gallium arsenide (GaAs) SCQD. Our results also suggest that oscillating electric field radiation leads to both coherent population transfer from the first excited to the ground states and to the scattering phenomenon. Therefore, investigating the interaction of an oscillating polaron-electric field (laser radiation) is especially relevant for gallium arsenide (GaAs).</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594804","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 Laplace New Iterative Method for Modeling Fractional Positron-Acoustic Cnoidal Waves in Electron-Positron-Ion Plasmas with Kaniadakis Distributed Electrons

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-03-11 DOI: 10.1007/s13538-025-01735-8

Albandari W. Alrowaily, Muhammad Khalid, Abdul Kabir, Alvaro H. Salas, C. G. L. Tiofack, Sherif M. E. Ismaeel, Samir A. El-Tantawy

{"title":"On the Laplace New Iterative Method for Modeling Fractional Positron-Acoustic Cnoidal Waves in Electron-Positron-Ion Plasmas with Kaniadakis Distributed Electrons","authors":"Albandari W. Alrowaily, Muhammad Khalid, Abdul Kabir, Alvaro H. Salas, C. G. L. Tiofack, Sherif M. E. Ismaeel, Samir A. El-Tantawy","doi":"10.1007/s13538-025-01735-8","DOIUrl":"10.1007/s13538-025-01735-8","url":null,"abstract":"<div><p>The propagation of high-frequency positron-acoustic cnoidal waves (PACWs) is investigated in four-component plasmas consisting of inertialess non-Maxwellian electrons and hot positrons adhering to the Kaniadakis distribution, together with inertial fluid cold positrons and stationary ions. Using the reductive perturbation approach (RPA), the quadratic planar Korteweg-de Vries (KdV) equation is derived, and its cnoidal wave (CW) solution is reported. Additionally, at a critical plasma composition, such as the hot positron concentration, the modified-KdV (mKdV) equation is derived, and its CW solution is investigated. Subsequently, to examine the distinctive behavior of the fractional PACWs, both the integer KdV and mKdV equations are transformed into their fractional counterparts, namely the fractional KdV (FKdV) and fractional mKdV (FmKdV) equations. The Laplace novel iterative method (LNIM) is utilized to solve both FKdV and FmKdV equations and derive high-accuracy approximations for the two equations for modeling the characteristic behavior of FKdV-PACWs and KmKdV-PACWs. The influence of several associated physical parameters on the profile (amplitude and width) of both KdV-PACWs and mKdV-PACWs is numerically examined. Additionally, the impact of the fractionality on the profile of both FKdV-PACWs and FmKdV-PACWs is investigated. Moreover, the absolute error of the derived approximations is estimated and discussed numerically. Furthermore, the potential applications of the current study are discussed, and the obtained results are valuable for investigating the cosmic ray spectrum and the plasma environment surrounding stars.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594767","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

Correction: Ground State Phase Diagrams of Borophene-Like Nanostructures with RKKY Interactions: A Monte Carlo Study

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-03-11 DOI: 10.1007/s13538-025-01743-8

Doha Kabouchi, Hussein Sabbah, R. El Fdil, Z. Fadil, A. Mhirech, E. Salmani, Seong Cheol Kim, Chaitany Jayprakash Raorane, Bousselham Kabouchi, Fohad Mabood Husain

引用次数: 0

Coriolis Force and Chaos in (2+1)-Dimensional Ion-Acoustic Waves with Two-Temperature Electron in Superthermal Plasma

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-03-10 DOI: 10.1007/s13538-025-01731-y

Aljawhara H. Almuqrin, B. B. Mouhammadoul, Alim, C. G. L. Tiofack, A. Mohamadou, Sherif M. E. Ismaeel, Samir A. El-Tantawy

{"title":"Coriolis Force and Chaos in (2+1)-Dimensional Ion-Acoustic Waves with Two-Temperature Electron in Superthermal Plasma","authors":"Aljawhara H. Almuqrin, B. B. Mouhammadoul,  Alim, C. G. L. Tiofack, A. Mohamadou, Sherif M. E. Ismaeel, Samir A. El-Tantawy","doi":"10.1007/s13538-025-01731-y","DOIUrl":"10.1007/s13538-025-01731-y","url":null,"abstract":"<div><p>We investigate the properties of ion-acoustic waves (IAWs) in a magnetized plasma composed of cold ions and kappa-distributed electrons at two temperatures (cold and hot). The reductive perturbative method is implemented to derive the Davey-Stewartson (DS) equations. Through the analysis of the bifurcation theory, the effects of Coriolis force and superthermal parameter are addressed in the phase orbit analysis. Using numerical simulations, the impact of changes in various plasma parameters is discussed on the ion-acoustic periodic (IAP) and ion-acoustic super-periodic (IASP) nonlinear solutions of the DS equations. We further investigated the chaotic behaviors of the IAWs corresponding to the perturbed systems of the DS equations with the help of the time series plot, Poincaré section and Lyapunov exponent. In chaotic motions of perturbed IAWs via a quasi-periodic pathway to chaos, the frequency <span>(omega )</span> and the amplitude of the external periodic disturbance <span>(f_{0})</span> act as the switching parameters. This work may be relevant to understanding the dynamic of IAWs in astrophysical and space plasmas like in Saturn’s magnetosphere where the combined effects of high energy particles and the Coriolis force can exist.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143583404","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

Experimental Particle Physics, Tracking Detectors and Cosmic Rays: A Legacy of César Lattes

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-03-10 DOI: 10.1007/s13538-025-01740-x

Edivaldo Moura Santos, José Maria Filardo Bassalo, Mauro S. D. Cattani, Sergio Duarte, Valdir Guimarães

引用次数: 0

Influence of Breeding Delays and Memory Effects on Predator-Prey Model Amidst Fear

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-03-08 DOI: 10.1007/s13538-025-01737-6

Jyotirmoy Roy, Bapin Mondal, Animesh Mahata, Shariful Alam, Sankar Prasad Mondal

{"title":"Influence of Breeding Delays and Memory Effects on Predator-Prey Model Amidst Fear","authors":"Jyotirmoy Roy, Bapin Mondal, Animesh Mahata, Shariful Alam, Sankar Prasad Mondal","doi":"10.1007/s13538-025-01737-6","DOIUrl":"10.1007/s13538-025-01737-6","url":null,"abstract":"<div><p>In this study, we present a predator-prey model that incorporates a delay in the prey’s reproduction resulting from fear induced by predators. Next, we modify our model to a fractional-order system, incorporating the effects of memory. Establishing positivity and boundedness of the solutions demonstrates the well-posedness of the system. The local and global asymptotic stability of the positive equilibria are established under certain suitable parametric conditions. Additionally, we prove the existence and uniqueness of solutions for the fractional-order system while ensuring that they remain bounded. It is observed that, depending on constraints defined by the values of the model parameters, the breeding delay in the model system has both a stabilizing and destabilizing role in the system dynamics. The maximum length of delay that preserves the stability of the limit cycle is calculated. In the presence of delay, it is noticed that the fear factor in model system dynamics plays exactly the opposite role to that of the system without delay; more preciously, when the prey species delayed their breeding, fear acts as a destabilizing factor. We also consider the modified fractional order system to reveal the impact of the forgetting process on the system dynamics. Numerical simulations capture system dynamics and reveal that the delayed model system exhibits abundant dynamics, including several stability changes and chaotic behavior. Order of fractional derivative found to be involved in changing the stability property of the system near the coexistence equilibrium state.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581033","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

Effect of Temperature Degeneracy on Two-Stream Instability in Chip-Based Semiconductor Plasmas

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-03-07 DOI: 10.1007/s13538-025-01739-4

Zulfiqar Ahmad, A. Mushtaq

{"title":"Effect of Temperature Degeneracy on Two-Stream Instability in Chip-Based Semiconductor Plasmas","authors":"Zulfiqar Ahmad, A. Mushtaq","doi":"10.1007/s13538-025-01739-4","DOIUrl":"10.1007/s13538-025-01739-4","url":null,"abstract":"<div><p>The dynamics of electron–hole counter-streaming quantum semiconductor plasmas within an electrostatic framework is investigated by employing the quantum hydrodynamics (QHD) model, considering the effects of Bohm potential, exchange-correlation potential, and arbitrary degenerate pressure. The analysis covers both nearly degenerate and nearly non-degenerate scenarios, addressing distinct time-scale instabilities. Numerical investigations are carried out using typical parameter values for <i>InP</i> and <i>GaN</i> semiconductors to analyze the real frequency and growth rate of the two-stream instabilities. In both regimes, an inverse relationship is observed between species density and instability phase velocity. The system’s instability grows with increasing electron streaming velocity and shrinks with increasing hole streaming velocity. In nearly degenerate plasmas, growth rates are lower when species temperatures are equal compared to differing temperature (<span>(T_{e}>T_{h})</span>) and higher compared to <span>(T_{e}<T_{h})</span>. In nearly non-degenerate cases, temperature variation has a negligible effect on the growth rate, underscoring the dominance of other quantum effects. In both, the nearly degenerate and nearly non-degenerate regimes, the exchange-correlation potential enhances plasma instability, while tunneling recoil and degeneracy pressure significantly reduce instability at larger wave numbers. This comprehensive investigation provides valuable insights into the quantum behavior of semiconductor plasmas, informing applications in electronic devices and semiconductor physics.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571049","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

High-Performance PVA/Graphene Oxide Composite for Cost-Effective and Sustainable Piezoelectric Energy Harvesting 用于低成本、可持续压电能量收集的高性能 PVA/氧化石墨烯复合材料

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-03-05 DOI: 10.1007/s13538-025-01728-7

M. P. Trasadiya, A. M. Vora

{"title":"High-Performance PVA/Graphene Oxide Composite for Cost-Effective and Sustainable Piezoelectric Energy Harvesting","authors":"M. P. Trasadiya, A. M. Vora","doi":"10.1007/s13538-025-01728-7","DOIUrl":"10.1007/s13538-025-01728-7","url":null,"abstract":"<div><p>This study explores the piezoelectric generator prototype, utilizing the PVA and graphene oxide composite for the first time, demonstrating superior energy conversion efficiency and power output under various mechanical stimuli, such as vibrations and pressure fluctuations. Graphene oxide and nanosheets were extracted by intercalating a 1 M HNO<sub>3</sub> solvent into the graphitic layers. This process involved applying a voltage bias of 2 V DC for 5 min, followed by increasing the voltage to 6 V DC for 5 h. Graphene oxide is identified via X-ray diffraction (XRD), ultraviolet–visible spectroscopy (UV–VIS), and Fourier transform infrared spectroscopy (FTIR). PVA typically peaks at around 2θ = 19.9°, which is the (101) plane. The direct energy bandgaps of the produced composite PVA/GO at 1 wt.% and 2 wt.% are 3.681 eV and 3.231 eV, respectively. FTIR spectra analysis of the PVA/graphene oxide composite reveals characteristic peaks from both components, indicating successful incorporation. The fabricated device, featuring a sandwich structure, exhibits superior performance with an impressive output voltage of approximately 15 Vpp. This device could be very effective in energy-harvesting applications. EDAX analysis shows that the carbon-to-oxygen ratio of approximately 3.86:1 is typical of well-oxidized graphene oxide, indicating a high oxidation level.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553822","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

Machine Learning–Assisted Design of Ytterbium-Based Materials with Tunable Bandgaps and Enhanced Stability

IF 1.5 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2025-03-04 DOI: 10.1007/s13538-025-01732-x

Sajjad H. Sumrra, Mamduh J. Aljaafreh, Sadaf Noreen, Abrar U. Hassan

{"title":"Machine Learning–Assisted Design of Ytterbium-Based Materials with Tunable Bandgaps and Enhanced Stability","authors":"Sajjad H. Sumrra, Mamduh J. Aljaafreh, Sadaf Noreen, Abrar U. Hassan","doi":"10.1007/s13538-025-01732-x","DOIUrl":"10.1007/s13538-025-01732-x","url":null,"abstract":"<div><p>This study presents a comprehensive machine learning (ML) investigation into the design of ytterbium (Yb)–based materials with tunable bandgaps and enhanced stability. A dataset of 2062 Yb-based compounds was compiled from the literature, featuring structural and electronic properties. Their descriptors are designed to calculate their bandgap values through quantum chemical studies. Out of various machine learning models, Random Forest and Decision Tree regression models produce the more accurate prediction for their predicted values. The feature importance analysis reveals that their HeavyAtomCount, AliphaticRings, Ar_Rings, and TPSA emerge as important descriptors to influence their bandgap and stability. Their stability analysis by their Convex Hull Diagrams identifies 73% of data within its stability boundary. Further insights are gained through their clustering analysis, utilizing K-means clustering (<i>k</i> = 4), t-SNE, and elbow methods. The results show 85% accuracy to predict their stability and reveal distinct their chemical profiles as stable, moderately stable, and less stable compounds. The current study design approach is supposed to enable the discovery of Yb-based compounds with their tailored properties, like their tunable bandgaps (0.5–4.5 eV) with their enhanced stability (> 70%). The study can provide insights for materials scientists to identify promising optoelectronic materials.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553891","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