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Three forms of dimension reduction for border-collision bifurcations 边界碰撞分岔的三种降维形式
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-05-07 DOI: 10.1016/j.physleta.2025.130603
D.J.W. Simpson
{"title":"Three forms of dimension reduction for border-collision bifurcations","authors":"D.J.W. Simpson","doi":"10.1016/j.physleta.2025.130603","DOIUrl":"10.1016/j.physleta.2025.130603","url":null,"abstract":"<div><div>For dynamical systems that switch between different modes of operation, parameter variation can cause periodic solutions to lose or acquire new switching events. When this causes the eigenvalues (stability multipliers) associated with the solution to change discontinuously, we show that if one eigenvalue remains continuous then all local invariant sets of the leading-order approximation to the system occur on a lower dimensional manifold. This allows us to analyse the dynamics with fewer variables, which is particularly helpful when the dynamics is chaotic. We compare this to two other codimension-two scenarios for which dimension reduction can be achieved.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"550 ","pages":"Article 130603"},"PeriodicalIF":2.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936742","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
Can an uncertainty relation generate a plasma? 不确定关系能产生等离子体吗？
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-05-07 DOI: 10.1016/j.physleta.2025.130611
A. Gholamhosseinian , R.W. Corkery , I. Brevik , M. Boström
{"title":"Can an uncertainty relation generate a plasma?","authors":"A. Gholamhosseinian ,&nbsp;R.W. Corkery ,&nbsp;I. Brevik ,&nbsp;M. Boström","doi":"10.1016/j.physleta.2025.130611","DOIUrl":"10.1016/j.physleta.2025.130611","url":null,"abstract":"<div><div>We explore the fundamental idea that there may be a role for the Casimir effect, via an uncertainty relation, in the generation of electron-positron and quark-gluon plasmas. We investigate this concept, reviewing the possible contribution of semi-classical electrodynamics to nuclear interactions, specifically focusing on the Casimir effect at sub-Fermi length scales. The main result is a temperature distance relation, derived from the time-energy uncertainty relation, which can have observable consequences at these extreme scales. From a more general perspective, since the energy-time uncertainty relation appears to be a significant physical quantity, we also provide a brief overview of recent developments in this direction in Sec. <span><span>3.2</span></span>.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"550 ","pages":"Article 130611"},"PeriodicalIF":2.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936743","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
Complex tridiagonal quantum Hamiltonians and matrix continued fractions 复三对角量子哈密顿量与矩阵连分式
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-05-07 DOI: 10.1016/j.physleta.2025.130604
Miloslav Znojil
{"title":"Complex tridiagonal quantum Hamiltonians and matrix continued fractions","authors":"Miloslav Znojil","doi":"10.1016/j.physleta.2025.130604","DOIUrl":"10.1016/j.physleta.2025.130604","url":null,"abstract":"<div><div>Quantum resonances described by non-Hermitian tridiagonal-matrix Hamiltonians <em>H</em> with complex energy eigenvalues are considered. The possibility is analyzed of the evaluation of quantities <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span> known as the singular values of <em>H</em>. What is constructed are self-adjoint block-tridiagonal operators <span><math><mi>H</mi></math></span> (with eigenvalues <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span>) and their resolvents (defined in terms of a matrix continued fraction, MCF). In an illustrative application of the formalism to the discrete version of conventional <span><math><mi>H</mi><mo>=</mo><mo>−</mo><msup><mrow><mi>d</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>/</mo><mi>d</mi><msup><mrow><mi>x</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>+</mo><mi>V</mi><mo>(</mo><mi>x</mi><mo>)</mo></math></span> with complex local <span><math><mi>V</mi><mo>(</mo><mi>x</mi><mo>)</mo><mo>≠</mo><msup><mrow><mi>V</mi></mrow><mrow><mo>⁎</mo></mrow></msup><mo>(</mo><mi>x</mi><mo>)</mo></math></span>, the numerical MCF convergence is found quick and, moreover, supported also by a fixed-point-based formal proof.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130604"},"PeriodicalIF":2.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922424","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
Average coherence with respect to generalized Wigner-Yanase-Dyson skew information and (N,M)-POVMs 广义Wigner-Yanase-Dyson偏态信息和（N，M）- povm的平均相干性
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-05-07 DOI: 10.1016/j.physleta.2025.130610
Ruo-xiao Chen, Yi Long, Yu-shuang Song, Liang Tang, Fan Wu
{"title":"Average coherence with respect to generalized Wigner-Yanase-Dyson skew information and (N,M)-POVMs","authors":"Ruo-xiao Chen,&nbsp;Yi Long,&nbsp;Yu-shuang Song,&nbsp;Liang Tang,&nbsp;Fan Wu","doi":"10.1016/j.physleta.2025.130610","DOIUrl":"10.1016/j.physleta.2025.130610","url":null,"abstract":"<div><div>Quantum coherence is a significant physical resource stemming from the principle of superposition of quantum states, and plays a pivotal role in elucidating the unique and intriguing properties of the quantum realm. At the same time, quantum measurement, serving as a critical tool for quantifying coherence, is intrinsically linked to the choice of measurement basis. Building on this foundation, we delve into the average coherence of arbitrary quantum states by leveraging generalized Wigner-Yanase-Dyson skew information and a broad class of informationally complete symmetric measurements, the latter can be viewed as a generalization encompassing of symmetric, informationally complete POVMs and mutually unbiased measurements. Furthermore, we define the maximal coherence of generalized Wigner-Yanase-Dyson skew information, and a series of trade-off relations between different maximal coherence and average coherence are derived. In order to verify the reliability of the obtained results, we have carried out detailed analysis with concrete examples.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130610"},"PeriodicalIF":2.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929623","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
Chirality dependent sorting of 360° domain wall in a branch structure 分支结构中360°畴壁的手性依赖分选
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-05-06 DOI: 10.1016/j.physleta.2025.130629
Vemuru Haragopal , Rohan Jaiswal , Vijayanandhini Kannan , Chandrasekhar Murapaka
{"title":"Chirality dependent sorting of 360° domain wall in a branch structure","authors":"Vemuru Haragopal ,&nbsp;Rohan Jaiswal ,&nbsp;Vijayanandhini Kannan ,&nbsp;Chandrasekhar Murapaka","doi":"10.1016/j.physleta.2025.130629","DOIUrl":"10.1016/j.physleta.2025.130629","url":null,"abstract":"<div><div>We have demonstrated 360° domain wall (DW) sorting in a branch structure based on its chirality. The 360° DW driven by the current-induced spin-transfer torque shows a linear motion with preserved spin texture up to a certain critical current density. Interestingly, the critical current density is shifted towards the higher values when the DW is driven in a branch structure. Above the critical current density, the 360° DW transforms into a novel vortex DW with spin texture different from the conventional vortex DWs. The core of the vortex DW moves transverse to the DW motion and drives the DW motion into one of the branches. Thus, the DWs with opposite chirality moves into different branches facilitating the chirality dependent sorting operation within the branch structure. The velocity of 360° DW changes linearly with increase in the current density values however it is independent of the angle between the two branches.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130629"},"PeriodicalIF":2.3,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931357","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
Polyacene-based spintronic devices modulated by doping with two nitrogen or boron atoms and hydrogenation effects 用掺杂两个氮或硼原子和氢化效应调制聚二烯基自旋电子器件
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-05-06 DOI: 10.1016/j.physleta.2025.130628
Lihua Wang , Lexiang Zhao , Bingjun Ding
{"title":"Polyacene-based spintronic devices modulated by doping with two nitrogen or boron atoms and hydrogenation effects","authors":"Lihua Wang ,&nbsp;Lexiang Zhao ,&nbsp;Bingjun Ding","doi":"10.1016/j.physleta.2025.130628","DOIUrl":"10.1016/j.physleta.2025.130628","url":null,"abstract":"<div><div>In this study, a series of spintronic devices is designed on the basis of on a pristine (P)/two nitrogen (N) or boron (B) atoms-doped polyacene chain, which is linked to two ferromagnetic zigzag graphene nanoribbons (ZGNRs) with symmetric single hydrogenation (H-ZGNRs-H) or asymmetric double-single hydrogenation (H2-ZGNRs-H). For H-4ZGNRs-H electrodes bridged by P/two N or B atoms-doped polyacene, a negligible/forward or reverse spin-filtering effect is generated under low bias voltages. However, for devices with P/two N or B atoms doped-polyacene sandwiched between H2–4ZGNRs-H and H-4ZGNRs-H, outstanding bichannel spin-filtering (100 %) and dual-orientation giant spin-rectifying (10<sup>4</sup> or 10<sup>‒4</sup>) behavior occur concurrently. In addition, the effect of molecular length, impurity position and types (an NN pair or a BB pair or a BN pair) on the spin transport properties of <em>n</em>-acene-based molecular devices are also investigated.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130628"},"PeriodicalIF":2.3,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929621","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
All-optical logical gates AND, OR, NOT, XNOR and XOR based on metalenses at 1.55 µm 基于1.55µm超透镜的全光逻辑门AND、OR、NOT、XOR和XOR
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-05-05 DOI: 10.1016/j.physleta.2025.130623
Hongbin Zhang , Lei Qin , Bin Wang , Shang Wang
{"title":"All-optical logical gates AND, OR, NOT, XNOR and XOR based on metalenses at 1.55 µm","authors":"Hongbin Zhang ,&nbsp;Lei Qin ,&nbsp;Bin Wang ,&nbsp;Shang Wang","doi":"10.1016/j.physleta.2025.130623","DOIUrl":"10.1016/j.physleta.2025.130623","url":null,"abstract":"<div><div>This paper presents a novel approach for high-speed optical logic gates based on metalenses. The logic gates consist of two or three phase-controllable metalenses, which can apply different phases to multiple incident light beams of the same initial phase, converging them to a common focal point. This generates interference, enabling logical operations. The advantages of this work include the flexible phase control capabilities of the metalenses, which break the stringent input-phase requirements typically associated with optical logic devices. Additionally, since light predominantly propagates through air, this enhances information transmission rates. The miniaturization of metalenses also offers a potential pathway for achieving efficient parallel computing. The achievable types of logic gates include AND, OR, NOT, XNOR, and XOR, with theoretical contrast ratio of 39.51 dB (OR), 19.21 dB (AND), 11.45 dB (NOT), 11.54 dB (XNOR), and 14.61 dB (XOR). Due to the identical structure, the bit rate for each logic gate stabilizes between 1.04 and 1.05 Tb/s at a 50 % duty cycle. The excellent performance and rapid transmission speeds validate the feasibility of implementing optical logic gates using metalenses.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130623"},"PeriodicalIF":2.3,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922428","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
Optimizing thermoelectric performance of halide perovskite Ca3AsBr3 through strain engineering 通过应变工程优化卤化钙钛矿Ca3AsBr3的热电性能
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-05-05 DOI: 10.1016/j.physleta.2025.130625
Sumedha Yadav, Sangeeta, Kulwinder Kumar, Mukhtiyar Singh
{"title":"Optimizing thermoelectric performance of halide perovskite Ca3AsBr3 through strain engineering","authors":"Sumedha Yadav,&nbsp;Sangeeta,&nbsp;Kulwinder Kumar,&nbsp;Mukhtiyar Singh","doi":"10.1016/j.physleta.2025.130625","DOIUrl":"10.1016/j.physleta.2025.130625","url":null,"abstract":"<div><div>We investigate structural, dynamical, elastic, electronic, and thermoelectric properties of cubic perovskite halide Ca<sub>3</sub>AsBr<sub>3</sub> under the effect of strain using first-principles calculations. It is found to have a direct bandgap of 2.425 eV that further reduces under compressive strain making it an ideal candidate for thermoelectric application. The material satisfies various stability criteria, e.g., dynamical, thermodynamical, and mechanical. The transport calculations show the highest Seebeck coefficient of value -458.227 μVK⁻¹ at 700 K for <em>n</em>-type Ca<sub>3</sub>AsBr<sub>3</sub> unstrained structure at carrier concentration 1 × 10<sup>21</sup> cm⁻³, which is further enhanced to -482.366 μVK⁻¹ for -2 % strain. The lattice thermal conductivity of the material is reduced from 1.243 Wm<sup>-1</sup>K<sup>-1</sup> to 0.627 Wm<sup>-1</sup>K<sup>-1</sup> at 700 K under 3 % strain. This low thermal conductivity, coupled with positive power factor values, results in increased peak thermoelectric figure of merit from 0.36 (unstrained) to 0.56 (+3 % strain) at 700 K for an <em>n</em>-type doping concentration of 1 × 10<sup>20</sup> cm⁻³.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130625"},"PeriodicalIF":2.3,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931358","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
Invariants of flows in 4-d space time 四维时空中流动的不变量
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-05-05 DOI: 10.1016/j.physleta.2025.130602
Susan Mathew Panakkal , Parameswaran R. , Vedan M.J.
{"title":"Invariants of flows in 4-d space time","authors":"Susan Mathew Panakkal ,&nbsp;Parameswaran R. ,&nbsp;Vedan M.J.","doi":"10.1016/j.physleta.2025.130602","DOIUrl":"10.1016/j.physleta.2025.130602","url":null,"abstract":"<div><div>Differential forms and Lie derivatives are widely used in the study of invariance of physical quantities. The vanishing of the Lie derivative of a quantity signifies its invariance as one moves along the curves that are integrals of the flow. In this paper, we consider incompressible flows and study their integral invariants. Techniques employed include the invariance of forms (both relative and absolute) in the Euclidean space-time framework. The study yields five categories of local invariants corresponding to five possible exterior forms in 4-D space-time. In the case of viscous flow, we develop methods to calculate the rate of change of circulation, helicity, parity, and vorticity flux. We arrive at a conclusion that the absolute integral invariance of the parity four form yields Ertel's potential vorticity theorem. An attempt is made to study the above invariants using the technique of geometric algebra also.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"552 ","pages":"Article 130602"},"PeriodicalIF":2.3,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942751","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
Analysis of plankton-fish system with delay of fear effect 具有延迟恐惧效应的浮游生物-鱼类系统分析
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-05-05 DOI: 10.1016/j.physleta.2025.130583
Renxiang Shi
{"title":"Analysis of plankton-fish system with delay of fear effect","authors":"Renxiang Shi","doi":"10.1016/j.physleta.2025.130583","DOIUrl":"10.1016/j.physleta.2025.130583","url":null,"abstract":"<div><div>We propose a three dimensional system including phytoplankton, zooplankton and fish, which describes the food chain between plankton and fish. We take Holling-II functional response to describe the predation ability of fish and zooplankton. For fear effect of predator exists in reality, so we introduce fear effect of fish into system, besides we think the influence of fear effect is not instantaneous, delay of fear effect has been included. We study the dynamics of plankton-fish system with delay of fear effect. First we study the positivity and boundedness of solution, which mean that all the species exist and their increase is limited by environment, then taking the delay of fear effect as parameter, we discuss Hopf bifurcation, estimate the length of delay to preserve the stability of limit cycle. At last, we give simulations about the influence of delay of fear effect on the dynamics of plankton-fish system and the sensitivity analysis of parameters on the density of plankton and fish without delay. Our results show that delay of fear effect can cause periodic oscillation and chaos for plankton-fish system, uptake rate of fish to zooplankton and death rate of fish have large impact on the density of plankton and fish.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130583"},"PeriodicalIF":2.3,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916672","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
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