Physics Letters A最新文献

Exploring cosmic dynamics in f(Q,C) gravity with modified corrections 在修正后的f（Q，C）引力中探索宇宙动力学

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-07-04 DOI: 10.1016/j.physleta.2025.130773

M. Sharif , M. Zeeshan Gul , Ahmad Nawaz

引用次数: 0

The diametric drive self-acceleration of beams with positive and negative mass in nonlocal nonlinear media 非局部非线性介质中正负质量梁的直径驱动自加速度

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-07-03 DOI: 10.1016/j.physleta.2025.130789

Shuxia Mo, Wei Hu, Daquan Lu

{"title":"The diametric drive self-acceleration of beams with positive and negative mass in nonlocal nonlinear media","authors":"Shuxia Mo, Wei Hu, Daquan Lu","doi":"10.1016/j.physleta.2025.130789","DOIUrl":"10.1016/j.physleta.2025.130789","url":null,"abstract":"<div><div>The diametric driven self-acceleration is manifested by two beams with positive and negative mass accelerating in the same direction. It is found that exists in nonlocal nonlinear media in the paper. Using the analogy between the band structure of photonic lattice and the dispersion relationship of homogeneous media, the asymptotic behavior of the refractive index and the Ehrenfest theorem, the acceleration expressions and the trajectory equations of two beams are obtained. The results from the trajectory equations are in excellent agreement with the results from the numerical simulation when the condition <span><math><mo>|</mo><msubsup><mrow><mi>β</mi></mrow><mrow><mi>A</mi></mrow><mrow><mo>″</mo></mrow></msubsup><mo>|</mo><mo>/</mo><msub><mrow><mi>K</mi></mrow><mrow><mi>A</mi></mrow></msub><msub><mrow><mi>E</mi></mrow><mrow><mi>A</mi></mrow></msub><mo>=</mo><mo>|</mo><msubsup><mrow><mi>β</mi></mrow><mrow><mi>B</mi></mrow><mrow><mo>″</mo></mrow></msubsup><mo>|</mo><mo>/</mo><msub><mrow><mi>K</mi></mrow><mrow><mi>B</mi></mrow></msub><msub><mrow><mi>E</mi></mrow><mrow><mi>B</mi></mrow></msub></math></span> is satisfied.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"555 ","pages":"Article 130789"},"PeriodicalIF":2.3,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563105","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

Spin-valley resolved transport and tunneling magnetoresistance in 8-Pmmn borophene-based ferromagnetic/insulator/ferromagnetic junction 8-Pmmn硼罗芬基铁磁/绝缘体/铁磁结的自旋谷解析输运和隧穿磁阻

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-07-02 DOI: 10.1016/j.physleta.2025.130787

Junru Du , Shuo Ma , Hongmei Zhang , De Liu

引用次数: 0

Characterizing non-Markovianity via quantum coherence based on Kirkwood-Dirac quasiprobability 基于Kirkwood-Dirac准概率的量子相干刻画非马尔可夫性

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-07-01 DOI: 10.1016/j.physleta.2025.130775

Yassine Dakir , Abdallah Slaoui , Rachid Ahl Laamara

{"title":"Characterizing non-Markovianity via quantum coherence based on Kirkwood-Dirac quasiprobability","authors":"Yassine Dakir , Abdallah Slaoui , Rachid Ahl Laamara","doi":"10.1016/j.physleta.2025.130775","DOIUrl":"10.1016/j.physleta.2025.130775","url":null,"abstract":"<div><div>We present a new measure of non-Markovianity based on the property of nonincreasing quantum coherence via Kirkwood-Dirac (KD) quasiprobability under incoherent completely positive trace-preserving maps. Quantum coherence via the KD quasiprobability is defined as the imaginary part of the KD quasiprobability, which is maximized over all possible second bases and evaluated using an incoherent reference basis. A measure non-Markovianity based on KD quasiprobability coherence would capture memory effects via the time evolution of the imaginary part of the KD quasiprobability, providing an experimentally accessible and physically intuitive alternative to traditional measures relying on quantum Fisher information or trace distance. This approach is applied to the study of dissipation and dephasing dynamics in single- and two-qubit systems. The results obtained show that, in the cases studied, our measure based on coherence via Kirkwood-Dirac quasiprobability performs at least as well as <span><math><msub><mrow><mi>ℓ</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span>-norm coherence in detecting non-Markovianity, this provides a novel perspective on the analysis of non-Markovian dynamics.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"555 ","pages":"Article 130775"},"PeriodicalIF":2.3,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523912","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 novel transfer matrix framework for multiple Dirac delta potentials 多重狄拉克δ势的一种新的传递矩阵框架

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-07-01 DOI: 10.1016/j.physleta.2025.130785

Joaquín Figueroa , Ivan Gonzalez , Daniel Salinas-Arizmendi

引用次数: 0

Electromagnetically induced transparency for a mechanical probe in a hybrid quantum circuit 混合量子电路中机械探针的电磁感应透明

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-07-01 DOI: 10.1016/j.physleta.2025.130786

M.C. de Oliveira , D.Z. Rossatto , O.P. de Sá Neto

引用次数: 0

Quantum circuit model for photonic quantum memristors and its optimization 光子量子忆阻器的量子电路模型及其优化

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-07-01 DOI: 10.1016/j.physleta.2025.130774

Guangzhen Dai , Wei Li , Shijin Zhong , Sihao Yang , Daohua Wu

引用次数: 0

Enhanced light absorption of graphene sheet with large bandwidth tunability in visible and near-infrared range 在可见光和近红外波段具有大带宽可调性的石墨烯片增强光吸收

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-06-30 DOI: 10.1016/j.physleta.2025.130791

Chaojun Tang , Jie Tong , Xingyu Wang , Fan Gao , Juan Deng , Yijun Tang , Bo Yan , Fanxin Liu , Zhendong Yan , Ping Gu

{"title":"Enhanced light absorption of graphene sheet with large bandwidth tunability in visible and near-infrared range","authors":"Chaojun Tang , Jie Tong , Xingyu Wang , Fan Gao , Juan Deng , Yijun Tang , Bo Yan , Fanxin Liu , Zhendong Yan , Ping Gu","doi":"10.1016/j.physleta.2025.130791","DOIUrl":"10.1016/j.physleta.2025.130791","url":null,"abstract":"<div><div>We present a detailed investigation into the bandwidth-tunable absorption enhancement of a graphene sheet across the visible and near-infrared spectral range. The graphene sheet is engineered in a unique sandwiched configuration, positioned between a periodic array of metal strips and a dielectric spacer layer on a metallic substrate. This configuration facilitates a near-field plasmon interaction between the individual metal strips and the substrate, leading to the formation of a localized magnetic resonance. The interplay between this magnetic resonance and the propagating surface plasmon resonance on the substrate surface results into the emergence of two hybrid modes. These hybrid modes are directly responsible for the appearance of two distinct absorption peaks in the graphene sheet's absorption spectra. By systematically varying the period of the metal strip array, we demonstrate a remarkable tunability in the graphene absorption bandwidth, ranging from 100 nm to 5 nm. This tuning capability is accompanied by a maximum light absorption efficiency of approximately 80 %, highlighting the potential for precise optical control. To further elucidate the underlying mechanism, we employ a double oscillator coupling model, which successfully explains the observed shifts in absorption peak positions as a function of the array period. The observed bandwidth-tunable absorption enhancement in graphene not only advances our fundamental understanding of light-matter interactions in hybrid plasmonic systems but also holds significant promise for practical applications.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"555 ","pages":"Article 130791"},"PeriodicalIF":2.3,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144534547","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

Variational quantum eigensolvers with quantum Gaussian filters for solving ground-state problems in quantum many-body systems 用量子高斯滤波器求解量子多体系统基态问题的变分量子本征解

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-06-27 DOI: 10.1016/j.physleta.2025.130766

Yihao Liu , Min-Quan He , Z.D. Wang

引用次数: 0

Reconfigurable terahertz metasurface and dynamic vortex beam manipulation based on the phase transition characteristics of VO2 基于VO2相变特性的可重构太赫兹超表面和动态涡旋光束操纵

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-06-27 DOI: 10.1016/j.physleta.2025.130776

Siyuan Zhu , Xin-Hua Deng , Yansong Liu , Jiaqi Geng , Yanxu Bao , Yuqiang Zhang , Yaokun Lou

{"title":"Reconfigurable terahertz metasurface and dynamic vortex beam manipulation based on the phase transition characteristics of VO2","authors":"Siyuan Zhu , Xin-Hua Deng , Yansong Liu , Jiaqi Geng , Yanxu Bao , Yuqiang Zhang , Yaokun Lou","doi":"10.1016/j.physleta.2025.130776","DOIUrl":"10.1016/j.physleta.2025.130776","url":null,"abstract":"<div><div>To overcome the technical limitations of static operational frameworks in conventional metasurfaces, this paper introduces a novel platform demonstrating dynamic reconfigurability utilizing the phase-transition properties of vanadium dioxide (VO₂). By designing an Au–VO₂ composite split-ring resonator (SRR), a temperature-responsive mechanism for dynamic topological charge control is established. Leveraging the insulator-to-metal (ITM) phase transition characteristics of VO₂, the transmission phase response of the metasurface unit can be finely tuned through precise temperature regulation. After structural parameter optimization and the application of a rotation strategy based on the Pancharatnam–Berry (PB) phase principle, the constructed periodic array structure achieves reversible switching between topological charges of ±1 and ±2 within the atmospheric window of 0.62–0.68 THz. Numerical simulations demonstrate that orbital angular momentum (OAM) vortex beams generated at distinct temperatures (293 K and 341 K) maintain stable main-lobe intensity distributions, confirming notable mode independence. Significantly, the reconfigured transmission phase response exhibits temperature-independent characteristics, realizing dynamically reconfigurable unit phase states. This research prevents an innovative solution for dynamic optical field control in the Terahertz (THz) band and offers valuable insights for advanced applications.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"555 ","pages":"Article 130776"},"PeriodicalIF":2.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563531","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