Physics Letters A最新文献_第5页

Supratransmission in a β-FPUT square lattice β-FPUT方形晶格中的超传输

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-28 DOI: 10.1016/j.physleta.2025.130587

Dina U. Abdullina , Evgeny K. Naumov , Yury V. Bebikhov , Mariya N. Semenova , Alexey A. Kudreyko , Sergey V. Dmitriev

{"title":"Supratransmission in a β-FPUT square lattice","authors":"Dina U. Abdullina , Evgeny K. Naumov , Yury V. Bebikhov , Mariya N. Semenova , Alexey A. Kudreyko , Sergey V. Dmitriev","doi":"10.1016/j.physleta.2025.130587","DOIUrl":"10.1016/j.physleta.2025.130587","url":null,"abstract":"<div><div>The supratransmission effect allows a nonlinear lattice to be excited by an external driving at frequencies outside the phonon spectrum if the driving amplitude is sufficiently large. Here we numerically study the energy flux into a <em>β</em>-Fermi-Pasta-Ulam-Tsingou square lattice from a pair of harmonically driven particles. Depending on the driving amplitude, a critical frequency <span><math><msup><mrow><mi>Ω</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math></span> is found, above which no energy is transferred to the lattice. When the driving frequency is close to <span><math><msup><mrow><mi>Ω</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math></span>, spatially localized large-amplitude vibrational modes called discrete breathers (DBs) are formed that move along a densely packed row of particles. When the excitation frequency is well below <span><math><msup><mrow><mi>Ω</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math></span> but above the phonon band, irregular particle oscillations are excited. This is because the lattice under consideration supports multiple DB solutions. Excitation frequencies close to the supratransmission threshold will excite only one type of DB, while driving at lower frequencies will excite different types of DBs, leading to irregular dynamics.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"550 ","pages":"Article 130587"},"PeriodicalIF":2.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906719","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

Dynamical behaviors of optical solitons, and Jacobi elliptic wave solutions of fractional chiral (2+1) dimensional NLSE in physics 光学孤子的动力学行为，以及分数手性（2+1）维NLSE的Jacobi椭圆波解

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-26 DOI: 10.1016/j.physleta.2025.130598

Md Mamunur Roshid , Md. Habibul Bashar , Shahram Rezapour , Mustafa Inc

{"title":"Dynamical behaviors of optical solitons, and Jacobi elliptic wave solutions of fractional chiral (2+1) dimensional NLSE in physics","authors":"Md Mamunur Roshid , Md. Habibul Bashar , Shahram Rezapour , Mustafa Inc","doi":"10.1016/j.physleta.2025.130598","DOIUrl":"10.1016/j.physleta.2025.130598","url":null,"abstract":"<div><div>Various complex nonlinear evolution equations are used to illustrate the inner characteristics of various complex processes that occur in real-life events. In this framework, we use extended Jacobian elliptic function expansion (JEFET) and extended hyperbolic function techniques (EHFT) to analyze optical soliton solutions (SSs) of fractional chiral (2 + 1) dimensional nonlinear Schrödinger's equation ((2 + 1)-D CNLSE) in field of physics and in the field of fluid sciences. The suggested methods provide insights into optical soliton in a variety of technical fields, including quantum mechanics, plasma physics, nonlinear optics, and optical communications. While nonlinearity produces distortions, dispersion causes signals to disperse and deteriorate over distance. These methods allow us to produce some optical soliton solutions that may be analytically expressed in terms of rational, hyperbolic, trigonometric, and elliptic functions. Double periodic wave (PW), PW with lump wave SSs, breather wave with PW, various kinky PW, periodic breather wave by using the extended JEFET, and double PW, kink-PW, periodic breather wave, double PW patterns by using the EHFT are the numerical forms of the obtained solution that are studied with three and two-dimensional diagrams in figures 1 through 10. We demonstrate the impact of truncated M-fractional parameters (MFP) for [<em>s</em> = 0.1,0.5,0.9] on a two-dimensional graph. The gathered results could help to clarify and better understand the physical properties of waves traveling through a dispersive material. As a result, the previously discussed applied techniques may be a useful tool for producing distinct, accurate SSs for a variety of applications, which are essential to engineering, nonlinear optics, and fluid.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"550 ","pages":"Article 130598"},"PeriodicalIF":2.3,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903271","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

Moral sensitivity drives cooperative evolution in Q-learning based donation games 在基于q学习的捐赠博弈中，道德敏感性驱动合作进化

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-25 DOI: 10.1016/j.physleta.2025.130581

Jianyu Pu, Jinzhuo Liu, Xusheng Liu, Jiqin Li, Wei Wang

引用次数: 0

Exploring structural, optoelectronic, and thermo-phononic properties of AcClO using DFT and AIMD 利用DFT和AIMD研究AcClO的结构、光电和热声子性质

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-25 DOI: 10.1016/j.physleta.2025.130584

Shaho M. Rasul , Yousif Hussein Azeez , Nzar Rauf Abdullah , Vidar Gudmundsson

{"title":"Exploring structural, optoelectronic, and thermo-phononic properties of AcClO using DFT and AIMD","authors":"Shaho M. Rasul , Yousif Hussein Azeez , Nzar Rauf Abdullah , Vidar Gudmundsson","doi":"10.1016/j.physleta.2025.130584","DOIUrl":"10.1016/j.physleta.2025.130584","url":null,"abstract":"<div><div>In this study, we present a comprehensive first-principles investigation into the structural, thermal, phononic, electronic, and optical properties of Actinium Oxychloride (AcClO). AcClO is a Matlockite-structured material containing a 5<em>f</em> radioactive element (Ac). Using four computational codes — CASTEP for density functional theory (DFT), Quantum Espresso for ab initio molecular dynamics (AIMD), Phonopy for phonon and heat capacity, and Phono3py for thermal conductivity and group velocity — we confirmed the energetic, dynamic, mechanical, and thermal stability of AcClO, through calculations of the formation energy, phonon dispersion, elastic constants, and AIMD simulations, respectively. Furthermore, bonding analysis through electron localization function (ELF) shows that AcClO is an ionic compound. Band structure (including the hybrid HSE06 functional), partial density of states (PDOS), and spin-polarized total DOS show that AcClO is a wide band gap and non-magnetic semiconductor. The heat capacity, entropy, and phonon PDOS analyses provide insights into the vibrational dynamics of AcClO, revealing interplay of atomic vibrations between the heavy Ac atoms and lighter O atoms. In computations of the complex dielectric function, refractive index and optical conductivity, we find that AcClO exhibits a high static dielectric constant and collective plasmons in the far ultraviolet spectrum. Bearing in mind the radioactive nature of AcClO, along with its predicted low lattice thermal conductivity, wide band gap, and high dielectric constant, it could be used for applications such as deep-sea thermal insulation devices and space UV-sensor housings. This first theoretical exploration of AcClO marks a significant contribution to the understanding of Matlockite-type structures and actinide-based oxychlorides.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"549 ","pages":"Article 130584"},"PeriodicalIF":2.3,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883159","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

Distribution function of thermal ripples in h-BN, graphene and MoS2 h-BN、石墨烯和MoS2中热波纹的分布函数

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-25 DOI: 10.1016/j.physleta.2025.130597

Xingye Tian, Rui Xun, Tienchong Chang, Jin Yu

{"title":"Distribution function of thermal ripples in h-BN, graphene and MoS2","authors":"Xingye Tian, Rui Xun, Tienchong Chang, Jin Yu","doi":"10.1016/j.physleta.2025.130597","DOIUrl":"10.1016/j.physleta.2025.130597","url":null,"abstract":"<div><div>Deformations induced by external loading in two-dimensional (2D) materials are well described by traditional thin plate and film theories. However, for randomly distributed ripples induced by thermal fluctuations, a systematic theory is still lacking to describe the structural state at finite temperature. In this work, we performed molecular dynamics simulations and statistical mechanics to investigate the distribution of thermal ripples in widely studied 2D materials like h-BN, graphene, and MoS<sub>2</sub>. Our results indicate that thermal ripples are different from the external force-induced deformations in 2D materials, and their probability decays exponentially as the ratio of ripple height to diameter (<em>t/D</em>) increases. By simply substituting the energy in Boltzmann distribution with classical bending energy of 2D materials, we found that the partition function is in proportion to the square root of the ratio of bending stiffness to temperature. The derived distribution function is in good agreement with molecular dynamics simulations, indicating that the probability conforms to the law of Boltzmann distribution. Our simulations and theoretical derivation will give a deeper understanding of ripple morphology in 2D materials and advance the development of the state theory of 2D systems at finite temperature.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"550 ","pages":"Article 130597"},"PeriodicalIF":2.3,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903272","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

Defected ground structure-based circularly polarized MIMO filtering dielectric resonator antenna 基于缺陷接地结构的圆极化MIMO滤波介质谐振器天线

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-25 DOI: 10.1016/j.physleta.2025.130589

Ke Xia, Yi-Qiang Bao, Hai-Feng Zhang

{"title":"Defected ground structure-based circularly polarized MIMO filtering dielectric resonator antenna","authors":"Ke Xia, Yi-Qiang Bao, Hai-Feng Zhang","doi":"10.1016/j.physleta.2025.130589","DOIUrl":"10.1016/j.physleta.2025.130589","url":null,"abstract":"<div><div>The alumina ceramic is applied to a circularly polarized (CP) filtering dielectric resonator antenna (FDRA) and a multiple-input multiple-output (MIMO) FDRA in this paper. Initially, an optimally performing band-pass filter is engineered and amalgamated with a Wilkinson power divider to establish a filtering feed network. The rectangular dielectric resonator is used as the radiating unit and is excited by the filtering feed network. The proposed CP FDRA demonstrates a relative impedance bandwidth of 37.24 %, a relative axial ratio bandwidth of 32.51 %, a peak gain of 6.08 dBi, and a maximum antenna efficiency of 94.17 %. Subsequently, the single FDRA is expanded into a two-port MIMO antenna. To augment the isolation and CP performance, an innovative defected ground structure is utilized between the dual radiation units. Moreover, the surface current is channeled to fourteen circular copper patches on the back of the substrate via fourteen conductive copper pillars. Following fabrication and soldering, the empirical results corroborate the simulation outcomes. The measured relative impedance bandwidth is 35.83 %, with the maximum isolation reaching 28.23 dB. The proposed MIMO antenna demonstrates exceptional isolation, a broad operating bandwidth, and effective out-of-band rejection, rendering it suitable for integration into the communication infrastructures of fifth-generation and wireless local area networks.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"549 ","pages":"Article 130589"},"PeriodicalIF":2.3,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143886848","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

The impact of community heterogeneity on information propagation and virus transmission in multi-layer networks 多层网络中群落异质性对信息传播和病毒传播的影响

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-25 DOI: 10.1016/j.physleta.2025.130582

Jinlong Ma , Zichang Yuan

{"title":"The impact of community heterogeneity on information propagation and virus transmission in multi-layer networks","authors":"Jinlong Ma , Zichang Yuan","doi":"10.1016/j.physleta.2025.130582","DOIUrl":"10.1016/j.physleta.2025.130582","url":null,"abstract":"<div><div>Community structures are ubiquitous in real-world networks, and community heterogeneity plays a pivotal role in the coupled dynamics of information propagation and virus transmission. Moreover, higher-order structures, such as 2-simplex, offer a novel theoretical framework for studying multi-node interactions. To explore these dynamics, a two-layer heterogeneous community network model is developed, where the upper layer represents information propagation dynamics, and the lower layer captures virus transmission processes. Through simulations, we investigate the impact of community heterogeneity and higher-order structures on propagation speed, threshold, and final scale. Results demonstrate that community heterogeneity significantly regulates the dynamics of information and virus propagation. We consider two scenarios where community heterogeneity exists in the upper and lower layers of the network. In both cases, networks with highly heterogeneous communities have a lower threshold than those with homogeneous communities. When community heterogeneity is present in the upper layer, the propagation scale of the highly heterogeneous community network is larger than that of the homogeneous network under the same virus transmission rate. In the case of heterogeneity in the lower layer, for lower virus transmission rates, the propagation scale of the highly heterogeneous community network is larger than that of the homogeneous network, while for higher virus transmission rates, the propagation scale of the highly heterogeneous community network is smaller than that of the homogeneous network. Additionally, higher-order structures play a crucial role in enhancing information propagation efficiency and suppressing virus transmission. This study provides new theoretical insights into propagation dynamics in complex networks and offers a foundation for optimizing public health interventions.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"549 ","pages":"Article 130582"},"PeriodicalIF":2.3,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878507","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

Monomer-dimer model on fractal lattices 分形晶格上的单体-二聚体模型

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-25 DOI: 10.1016/j.physleta.2025.130580

Dušanka Marčetić

引用次数: 0

Tunability of Goos-Hänchen effect for a monolayer graphene coated epsilon-near-zero slab in non-integer dimensional media 非整数维介质中单层石墨烯涂层epsilon-近零板Goos-Hänchen效应的可调性

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-25 DOI: 10.1016/j.physleta.2025.130576

Nimra Ali , Maria Iqbal , Qurat-ul-Ain Minhas , Waleed Iqbal Waseer , Q.A. Naqvi

引用次数: 0

Bright solitons under fractional diffraction and various harmonic potentials 分数衍射和各种谐波势下的亮孤子