Physics Letters A最新文献

Controlled synthesis and magnetic properties of BiFeO3 nanoparticles using sucrose 用蔗糖控制合成BiFeO3纳米颗粒及其磁性能

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2025-09-25 DOI: 10.1016/j.physleta.2025.131005

B.J. Santos , J.G.S. Duque , C.T. Meneses , G.S. Cunha , L.A. Fernandes , R.A.G. Silva , E.M. Bittar , H. Fabrelli , M.H. Carvalho , A.M. Caffer , P.G. Pagliuso , F. Mesquita

{"title":"Controlled synthesis and magnetic properties of BiFeO3 nanoparticles using sucrose","authors":"B.J. Santos , J.G.S. Duque , C.T. Meneses , G.S. Cunha , L.A. Fernandes , R.A.G. Silva , E.M. Bittar , H. Fabrelli , M.H. Carvalho , A.M. Caffer , P.G. Pagliuso , F. Mesquita","doi":"10.1016/j.physleta.2025.131005","DOIUrl":"10.1016/j.physleta.2025.131005","url":null,"abstract":"<div><div>BiFeO<sub>3</sub> nanoparticles are synthesized via the co-precipitation method using sucrose as an agent to control particle size. The synthesis predominantly results in single-phase BiFeO<sub>3</sub> with rhombohedral symmetry (space group <span><math><mi>R</mi><mn>3</mn><mi>c</mi></math></span>), leading to a reduction in particle size from 50 to 25 nm with increasing sucrose concentration. Thermal analysis, performed via thermogravimetric analysis and differential scanning calorimetry, confirms the formation of a stable phase and provides insights into the crystallization dynamics. Magnetization measurements indicate superparamagnetic behavior dependent on particle size, while Mössbauer spectroscopy confirms high purity and minimal secondary phases. The observed magnetization values are lower than theoretically predicted, suggesting that the magnetic moments of Fe<sup>3+</sup> ions may be canted due to the Dzyaloshinskii-Moriya interaction.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"562 ","pages":"Article 131005"},"PeriodicalIF":2.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145160337","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

Analytical framework and reservoir engineering of coherence freezing in single-qubit systems 单量子位系统相干冻结的分析框架与储层工程

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2025-09-25 DOI: 10.1016/j.physleta.2025.131008

Sajjad Saei

{"title":"Analytical framework and reservoir engineering of coherence freezing in single-qubit systems","authors":"Sajjad Saei","doi":"10.1016/j.physleta.2025.131008","DOIUrl":"10.1016/j.physleta.2025.131008","url":null,"abstract":"<div><div>We present a unified, time-dependence–agnostic affine-Bloch framework for freezing of single-qubit quantum coherence in open systems. From the affine map of completely positive trace-preserving dynamics, we derive compact necessary and sufficient conditions for constancy of both the <span><math><msub><mrow><mi>ℓ</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span>-norm and the relative entropy of coherence, yielding explicit geometric “freeze manifolds” in Bloch space. Specializing to four canonical noisy channels—Pauli (unital, diagonal), depolarizing (isotropic, unital), amplitude damping (AD), and generalized amplitude damping (GAD)—we show that nontrivial freezing occurs only for Pauli <em>subchannels</em> that exactly preserve a Cartesian axis; otherwise, freezing is restricted to incoherent (<em>z</em>-axis) states, independently of the specific time-dependence. Within strictly incoherent (SIO) classes, freezing of the relative entropy of coherence implies measure-independent freezing. Beyond analysis, we introduce two design templates that <em>enforce</em> exact freezing by making target off-diagonal operators fixed points of the Heisenberg generator: (A) a projector-based, ancilla-free construction and (B) a decoherence-free-subspace (DFS) scheme via collective symmetry. Numerical case studies corroborate the predicted hierarchy and the engineered-freeze protocols.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"562 ","pages":"Article 131008"},"PeriodicalIF":2.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145160338","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

A multi-feature vital node identification scheme in complex networks 复杂网络中多特征关键节点识别方案

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2025-09-24 DOI: 10.1016/j.physleta.2025.131004

Xinbang Cheng , Jiafei Liu , Qiang He , Jingli Wu , Gaoshi Li

{"title":"A multi-feature vital node identification scheme in complex networks","authors":"Xinbang Cheng , Jiafei Liu , Qiang He , Jingli Wu , Gaoshi Li","doi":"10.1016/j.physleta.2025.131004","DOIUrl":"10.1016/j.physleta.2025.131004","url":null,"abstract":"<div><div>Identifying vital nodes in complex networks constitutes a fundamental challenge with profound implications for optimizing information dissemination dynamics. This critical task finds extensive applications across diverse domains including epidemic containment, public opinion management, traffic regulation, and rumor dissemination. However, existing node centrality metrics face inherent limitations arising from their unilateral emphasis on either local neighborhood features (e.g., degree centrality) or global topological properties (e.g., betweenness centrality), thereby failing to reflect the multi-scale influence of nodes comprehensively. To tackle this critical gap, we propose DEGM (Extended Degree and Information Entropy-based Gravity Model), a novel framework that integrates local non-immediate neighbor characteristics with global structural information for improved vital node identification. First, we introduce the extended degree-based index, which systematically incorporates both first-order and second-order neighborhood information through a decay-weighted aggregation mechanism, thereby enabling more precise quantification of nodes' local influence. Furthermore, we integrate information entropy theory into the gravity formulation to dynamically adjust interaction weights between node pairs, effectively capturing the heterogeneity of global influence propagation. In-depth experimental assessments on nine practical networks demonstrate the superior performance of DEGM against 11 state-of-the-art benchmarks. Notably, quantitative analysis reveals that DEGM exhibits excellent discriminative capability in terms of Kendall's tau coefficient, Jaccard similarity, Monotonicity, and complementary cumulative distribution function (CCDF), significantly outperforming conventional centrality methods.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"562 ","pages":"Article 131004"},"PeriodicalIF":2.6,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159885","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

Collective excitation of Bose-Einstein condensate of Bose atoms with Pöschl-Teller interaction 玻色原子与Pöschl-Teller相互作用的玻色-爱因斯坦凝聚的集体激发

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2025-09-24 DOI: 10.1016/j.physleta.2025.131006

Avra Banerjee, Arnab Bhowmik, Dwipesh Majumder

引用次数: 0

Semi-explosive and abrupt death via attractive-repulsive conjugate coupling 通过吸引-排斥共轭耦合导致的半爆炸性和突发性死亡

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2025-09-24 DOI: 10.1016/j.physleta.2025.131009

Tuba , Umesh Kumar Verma , Amit Sharma

引用次数: 0

Analytical bright soliton solutions of the nonlinear Schrödinger equation including both high-order diffraction effect and parabolic-law nonlinearity 含高阶衍射效应和抛物律非线性的非线性Schrödinger方程的亮孤子解析解

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2025-09-23 DOI: 10.1016/j.physleta.2025.131011

Shujun Chen, Liang Xiang, Lijun Song

{"title":"Analytical bright soliton solutions of the nonlinear Schrödinger equation including both high-order diffraction effect and parabolic-law nonlinearity","authors":"Shujun Chen, Liang Xiang, Lijun Song","doi":"10.1016/j.physleta.2025.131011","DOIUrl":"10.1016/j.physleta.2025.131011","url":null,"abstract":"<div><div>By using the new Kudryashov method (NKM), we derived two bright soliton solutions of the nonlinear Schrödinger equation, which simultaneously includes high-order diffraction effects, parabolic-law nonlinearity and weakly nonlocal nonlinearity. The characteristics of the two soliton solutions were also studied in detail. The research results show that the diffraction effects, nonlinear coefficient and soliton wave number all have significant influences on the transmission dynamics characteristics of solitons. We can achieve long-distance transmission where the soliton maintains its shape and the center position unchanged by reasonably adjusting these parameters. The research reveals the synergistic mechanism among parameters and points out that maintaining the critical balance between the system parameters is a key challenge in practical applications. The relevant results in this paper provide certain theoretical support for the soliton transmission in complex nonlinear systems and offer a new perspective for the optimization of signal transmission in optical fiber communication.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"562 ","pages":"Article 131011"},"PeriodicalIF":2.6,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145160336","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

PINNs with hybrid residual-driven adaptive sampling and weighted loss for the (2+1)-dimensional gpKP equation （2+1）维gpKP方程的混合残差驱动自适应采样和加权损失pinn

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2025-09-22 DOI: 10.1016/j.physleta.2025.130998

Zhao Zhao, Bo Ren

{"title":"PINNs with hybrid residual-driven adaptive sampling and weighted loss for the (2+1)-dimensional gpKP equation","authors":"Zhao Zhao, Bo Ren","doi":"10.1016/j.physleta.2025.130998","DOIUrl":"10.1016/j.physleta.2025.130998","url":null,"abstract":"<div><div>To address the challenges of predicting complex solutions and parameter inversion for high-dimensional nonlinear partial differential equations (PDEs), this study proposes an adaptive sampling and loss weighting physics-informed neural network (ASW-PINN) method, overcoming the limitations of traditional PINNs in capturing regions with steep variations. The ASW-PINN method employs a hybrid residual-driven adaptive sampling strategy (combining PDE residuals and their gradients) to dynamically enhance sampling density in high-error regions, while integrating a weighted loss function to balance optimization priorities across physical constraints. We conduct a series of experimental comparisons between the traditional PINNs and the ASW-PINN method, using the (2+1)-dimensional generalized potential Kadomtsev-Petviashvili equation as an example. The experimental results clearly demonstrate the effectiveness of the ASW-PINN method in improving accuracy, with the relative <span><math><msub><mrow><mi>L</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> error of the final results reduced in predicting all four solutions. For parameter inversion tasks, the ASW-PINN method accurately identifies equation parameters under noise contamination, highlighting its robustness. Furthermore, key factors affecting the performance of neural networks are discussed in detail, including the number of extra data points added and the architecture of the neural network.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"562 ","pages":"Article 130998"},"PeriodicalIF":2.6,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120777","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

Role of astrocyte on neuronal synchrony in chaotic environment 混沌环境下星形胶质细胞在神经元同步中的作用

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2025-09-22 DOI: 10.1016/j.physleta.2025.131002

Tugba Palabas , Dibakar Ghosh

{"title":"Role of astrocyte on neuronal synchrony in chaotic environment","authors":"Tugba Palabas , Dibakar Ghosh","doi":"10.1016/j.physleta.2025.131002","DOIUrl":"10.1016/j.physleta.2025.131002","url":null,"abstract":"<div><div>In this work, we investigate the role of astrocytes in regulating synchronization between neurons through modulation of their firing rates in a chaotic environment. To do this, we consider a tripartite system, consisting of a presynaptic neuron, a postsynaptic neuron, and an astrocyte, to be used to analyze the influence of astrocytic dynamics on neuronal behavior. The effects of astrocyte-mediated depolarizing and hyperpolarizing influences on the neuronal membrane potential are explored, focusing on how these processes alter spike activity under constant chaotic conditions. The study reveals that astrocytes can modulate the timing of random spike patterns in both neurons, with the excitatory and inhibitory effects of astrocytes leading to significant changes in neuronal firing rates. The results indicate that varying the astrocytic influence (parameterized by <em>ϵ</em>) can enhance or suppress neuronal firing rates, providing deeper insight into the mechanisms underlying the interactions between astrocytes and neurons in chaotic environments. The effect of <span><math><mi>C</mi><msup><mrow><mi>a</mi></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span> channel noise of astrocytes on synchronization is considered and it is noted that astrocytic noise disrupts synchronization between neurons.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"562 ","pages":"Article 131002"},"PeriodicalIF":2.6,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159882","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

Generalized (n,N − n)-fold Darboux transformation and localized wave solutions for a general coupled nonlinear Schrödinger equations 广义（n, n − ）-fold Darboux变换和一般耦合非线性Schrödinger方程的局域波解

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2025-09-22 DOI: 10.1016/j.physleta.2025.131001

Xiangyun Wang, Yi Zhang, Jiajie Wu, Jianan Wang

引用次数: 0

Observational constraining on inflationary parameters in Barrow inspired f(R) cosmology 巴罗启发的f(R)宇宙学中暴胀参数的观测约束

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2025-09-19 DOI: 10.1016/j.physleta.2025.130974

Abdul Jawad , Nadeem Azhar , Ayesha Riasat , Abdul Malik Sultan , Shamaila Rani , Sanjar Shaymatov , Hafiza Iqra Nadeem

{"title":"Observational constraining on inflationary parameters in Barrow inspired f(R) cosmology","authors":"Abdul Jawad , Nadeem Azhar , Ayesha Riasat , Abdul Malik Sultan , Shamaila Rani , Sanjar Shaymatov , Hafiza Iqra Nadeem","doi":"10.1016/j.physleta.2025.130974","DOIUrl":"10.1016/j.physleta.2025.130974","url":null,"abstract":"<div><div>This study is dedicated to discuss the inflationary setup with the help of modified Barrow entropy in context of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> gravity framework. We derive the Friedmann equations by using the first law of thermodynamics. With the help of these equations, we reconstruct <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> gravity model to establish the relationships governing scalar and tensor perturbation power spectra and interestingly this model mimics thermodynamically under the slow-roll approximation. Four different types of potentials like the <em>β</em> potential, exponential potential, large field potential and pure arctan potential are used to explore the insights of inflationary parameters in the underlying scenario. With these potentials, mathematical formalism of different inflationary parameters such as slow roll parameters, scalar power spectrum, scalar spectral index and tensor-to-scalar ratio are found. Moreover, the graphs of scalar spectral index and tensor-to-scalar ratio are plotted to compare with the latest observational data. It is worthwhile to mention that our results are consistent with Planck 2018 data.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"561 ","pages":"Article 130974"},"PeriodicalIF":2.6,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108422","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