Pub Date : 2025-12-18DOI: 10.1016/j.physleta.2025.131250
Yuri Pokotilovski
A semi-classical consideration is presented for the neutron Lloyd’s mirror interferometer in the Earth gravitational field. The phase shifts were calculated for different parameters of interferometer using classical neutron path ways curved by gravitation.
{"title":"Lloyd’s mirror neutron interferometer in the earth gravitational field","authors":"Yuri Pokotilovski","doi":"10.1016/j.physleta.2025.131250","DOIUrl":"10.1016/j.physleta.2025.131250","url":null,"abstract":"<div><div>A semi-classical consideration is presented for the neutron Lloyd’s mirror interferometer in the Earth gravitational field. The phase shifts were calculated for different parameters of interferometer using classical neutron path ways curved by gravitation.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"569 ","pages":"Article 131250"},"PeriodicalIF":2.6,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789469","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}
Pub Date : 2025-12-15DOI: 10.1016/j.physleta.2025.131267
Barkathulla Asrafali , Fahim Khan , Syam MS , Natesan Yogesh , Suling Shen , Qiang Liu , Zhengbiao Ouyang
We introduce a unidirectional cavity coupler utilizing transformation optics (TO), that enables the transport of unidirectional electromagnetic waves without the use of magnets in a highly mode-selective manner. The proposed cavity enables fundamental, dipole, and higher-order resonances with suppressed back-propagation, facilitated by destructive interference, exploiting spatially engineered permittivity profiles based on the principle of analogous transmission. Simulation results show strong isolation of the forward and reverse excitations. Using this directional confinement, we can rapidly heat a dielectric material placed in the center of the cavity, with dielectric heating: at 4.06 GHz with a z-polarized field of 1000 V/m, the temperature of an alumina (Al2O3) rod at the center of the cavity not only reaches 1602.03 °C in a minute, but also the heating rate becomes 26.8 °C. Such findings point to the future of TO cavities in small, bias-free, electromagnetic wave control and low-power directional heating tool designs.
{"title":"Transformation optical unidirectional cavity for unidirectional heating applications","authors":"Barkathulla Asrafali , Fahim Khan , Syam MS , Natesan Yogesh , Suling Shen , Qiang Liu , Zhengbiao Ouyang","doi":"10.1016/j.physleta.2025.131267","DOIUrl":"10.1016/j.physleta.2025.131267","url":null,"abstract":"<div><div>We introduce a unidirectional cavity coupler utilizing transformation optics (TO), that enables the transport of unidirectional electromagnetic waves without the use of magnets in a highly mode-selective manner. The proposed cavity enables fundamental, dipole, and higher-order resonances with suppressed back-propagation, facilitated by destructive interference, exploiting spatially engineered permittivity profiles based on the principle of analogous transmission. Simulation results show strong isolation of the forward and reverse excitations. Using this directional confinement, we can rapidly heat a dielectric material placed in the center of the cavity, with dielectric heating: at 4.06 GHz with a z-polarized field of 1000 V/m, the temperature of an alumina (Al<sub>2</sub>O<sub>3</sub>) rod at the center of the cavity not only reaches 1602.03 °C in a minute, but also the heating rate becomes 26.8 °C. Such findings point to the future of TO cavities in small, bias-free, electromagnetic wave control and low-power directional heating tool designs.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"569 ","pages":"Article 131267"},"PeriodicalIF":2.6,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789351","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}
Pub Date : 2025-12-15DOI: 10.1016/j.physleta.2025.131264
Xiaomin Cheng , Xingxing Xu , Anping Wan , Khalil AL-Bukhaiti , Junjie Jiang , Xiaosheng Ji
Magnetorheological fluid-based microfluidic channels address key limitations of solid-walled systems, including wall contamination, biomolecule adsorption, and high-pressure demands in biochip applications. This study elucidates the formation and stability of the central zero magnetic field line in a quadrupole magnetic source, essential for enabling wall-free fluid flow, define "stability" as the insensitivity of the zero-field line to small practical asymmetries. Integrating theoretical modeling via Biot-Savart law and magnetic superposition principles, ANSYS Maxwell 3D simulations, and experimental validation with four symmetrically arranged electromagnets, we confirm zero magnetic induction along the central axis and elevated intensities near poles. Asymmetric configurations disrupt this zero-field condition, underscoring symmetry's role. Illumination tests with ferroferric oxide powder demonstrate robust, wall-free channel formation under varying currents and pole spacings, with Y-direction intensity decaying rapidly toward the center. These insights align with prior magnetic fluid control studies, offering a theoretical-empirical framework to optimize low-friction, contamination-resistant microfluidic systems for biochips. This study bridges the well-established theory of quadrupole magnets with the emerging need for contamination-resistant microfluidic systems. The paper provides a reproducible framework for designing and validating quadrupole-based microfluidic channels, with emphasis on stability under realistic asymmetric conditions.
{"title":"Formation and stability of zero magnetic field lines in quadrupole magnetic sources for magnetorheological microfluidic systems","authors":"Xiaomin Cheng , Xingxing Xu , Anping Wan , Khalil AL-Bukhaiti , Junjie Jiang , Xiaosheng Ji","doi":"10.1016/j.physleta.2025.131264","DOIUrl":"10.1016/j.physleta.2025.131264","url":null,"abstract":"<div><div>Magnetorheological fluid-based microfluidic channels address key limitations of solid-walled systems, including wall contamination, biomolecule adsorption, and high-pressure demands in biochip applications. This study elucidates the formation and stability of the central zero magnetic field line in a quadrupole magnetic source, essential for enabling wall-free fluid flow, define \"stability\" as the insensitivity of the zero-field line to small practical asymmetries. Integrating theoretical modeling via Biot-Savart law and magnetic superposition principles, ANSYS Maxwell 3D simulations, and experimental validation with four symmetrically arranged electromagnets, we confirm zero magnetic induction along the central axis and elevated intensities near poles. Asymmetric configurations disrupt this zero-field condition, underscoring symmetry's role. Illumination tests with ferroferric oxide powder demonstrate robust, wall-free channel formation under varying currents and pole spacings, with Y-direction intensity decaying rapidly toward the center. These insights align with prior magnetic fluid control studies, offering a theoretical-empirical framework to optimize low-friction, contamination-resistant microfluidic systems for biochips. This study bridges the well-established theory of quadrupole magnets with the emerging need for contamination-resistant microfluidic systems. The paper provides a reproducible framework for designing and validating quadrupole-based microfluidic channels, with emphasis on stability under realistic asymmetric conditions.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"569 ","pages":"Article 131264"},"PeriodicalIF":2.6,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789411","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}
Pub Date : 2025-12-15DOI: 10.1016/j.physleta.2025.131198
Ali N.A. Koam , Shahid Chaudhary , Farruh Atamurotov , Ali Ahmad , Ibtisam Masmali
We investigate the gravitational, optical, and dynamical characteristics of regular black holes originating from nonminimally coupled Einstein-Yang-Mills (EYM) theory within the framework of Rainbow gravity. The study is motivated by the need to explore quantum gravity corrections to classical black hole models, particularly through the incorporation of energy-dependent spacetime metrics. By modifying the standard EYM solution with rainbow functions, we consider an interesting family of regular black hole geometries that depend explicitly on the probe energy and introduce a running gravitational coupling. Using the Gauss-Bonnet topological method, we derive analytical expressions for the weak deflection angle of light, revealing that both the Rainbow gravity parameter λ and the Yang-Mills coupling constant q significantly enhance gravitational lensing. The analysis is extended to include plasma effects, demonstrating that the frequency-dependent refractive index alters the deflection profile and introduces chromatic dispersion. Furthermore, we adopt the Jacobi geometry approach to evaluate the deflection of massive particles and show that the deformation parameter λ, particle velocity v, and gauge coupling q intricately modulate particle trajectories. We also examine the impact of these modifications on observable features such as accretion disk images and black hole shadows. Utilizing the Novikov-Thorne thin disk model and static spherical accretion framework, we obtain accretion disk and photon rings. The results show that increasing λ and q leads to a decrease in shadow size, an enhancement in brightness, and greater distortion of secondary images-effects that arise due to intensified spacetime curvature near the black hole.
{"title":"Effects of gravitational lensing onto accretion disk and shadow images of regular black holes in rainbow gravity","authors":"Ali N.A. Koam , Shahid Chaudhary , Farruh Atamurotov , Ali Ahmad , Ibtisam Masmali","doi":"10.1016/j.physleta.2025.131198","DOIUrl":"10.1016/j.physleta.2025.131198","url":null,"abstract":"<div><div>We investigate the gravitational, optical, and dynamical characteristics of regular black holes originating from nonminimally coupled Einstein-Yang-Mills (EYM) theory within the framework of Rainbow gravity. The study is motivated by the need to explore quantum gravity corrections to classical black hole models, particularly through the incorporation of energy-dependent spacetime metrics. By modifying the standard EYM solution with rainbow functions, we consider an interesting family of regular black hole geometries that depend explicitly on the probe energy and introduce a running gravitational coupling. Using the Gauss-Bonnet topological method, we derive analytical expressions for the weak deflection angle of light, revealing that both the Rainbow gravity parameter <em>λ</em> and the Yang-Mills coupling constant <em>q</em> significantly enhance gravitational lensing. The analysis is extended to include plasma effects, demonstrating that the frequency-dependent refractive index alters the deflection profile and introduces chromatic dispersion. Furthermore, we adopt the Jacobi geometry approach to evaluate the deflection of massive particles and show that the deformation parameter <em>λ</em>, particle velocity <em>v</em>, and gauge coupling <em>q</em> intricately modulate particle trajectories. We also examine the impact of these modifications on observable features such as accretion disk images and black hole shadows. Utilizing the Novikov-Thorne thin disk model and static spherical accretion framework, we obtain accretion disk and photon rings. The results show that increasing <em>λ</em> and <em>q</em> leads to a decrease in shadow size, an enhancement in brightness, and greater distortion of secondary images-effects that arise due to intensified spacetime curvature near the black hole.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"568 ","pages":"Article 131198"},"PeriodicalIF":2.6,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788355","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}
Pub Date : 2025-12-15DOI: 10.1016/j.physleta.2025.131271
Samad Roshan Entezar
This study presents the design and analysis of a one-dimensional (1D) topological photonic crystal (PC) formed by interfacing two distinct 1D PCs, PC1 and PC2, with unit cell configurations ABA and B′A′B′, respectively, composed of epsilon-negative (ENG) and mu-negative (MNG) single-negative (SNG) metamaterials. By tuning the layer thicknesses, the photonic band structures of PC1 and PC2 are engineered to exhibit opposite topological properties, resulting in a robust topological edge state (TES) at their interface. This TES, arising from a Zak phase discontinuity, is protected against backscattering and persists under moderate structural perturbations, enabling applications in defect-immune waveguiding and field confinement. Using transfer matrix method (TMM), we demonstrate overlapping photonic band gaps (PBGs) with opposite reflection phases, confirming the TES condition. Numerical simulations reveal two high-quality TESs at 4.473 GHz and 8.267 GHz within the first and third PBGs, respectively, with strong localization and high transmission, even in the presence of damping and geometric disorder. The low-frequency TES exhibits greater resilience to incident-angle variations and perturbations compared to the high-frequency counterpart, particularly for TM polarization. These findings highlight the potential of ENG/MNG-based topological PCs for compact, reconfigurable photonic circuits, high-Q resonators, and robust microwave or terahertz devices.
本研究设计和分析了一种一维（1D）拓扑光子晶体（PC），该晶体由两个不同的一维光子晶体PC1和PC2连接而成，分别具有单晶构型ABA和B ' a ' B '，由负ε (ENG)和负mu （MNG）单负（SNG）超材料组成。通过调整层厚度，PC1和PC2的光子带结构被设计成具有相反的拓扑特性，从而在它们的界面处产生鲁棒的拓扑边缘态（TES）。这种由Zak相位不连续产生的TES可以防止后向散射，并在适度的结构扰动下持续存在，从而可以应用于缺陷免疫波导和场约束。利用传输矩阵法（TMM），我们展示了具有相反反射相位的重叠光子带隙（PBGs），证实了TES条件。数值模拟结果表明，在第一和第三PBGs中，分别在4.473 GHz和8.267 GHz处存在两个高质量的TESs，即使存在阻尼和几何紊乱，也具有强局域化和高传输。与高频对应物相比，低频TES对入射角变化和扰动表现出更大的弹性，特别是对于TM极化。这些发现突出了基于ENG/ mg的拓扑pc在紧凑、可重构光子电路、高q谐振器和鲁棒微波或太赫兹器件方面的潜力。
{"title":"Topological edge states in single-negative metamaterial photonic crystals","authors":"Samad Roshan Entezar","doi":"10.1016/j.physleta.2025.131271","DOIUrl":"10.1016/j.physleta.2025.131271","url":null,"abstract":"<div><div>This study presents the design and analysis of a one-dimensional (1D) topological photonic crystal (PC) formed by interfacing two distinct 1D PCs, PC1 and PC2, with unit cell configurations ABA and B′A′B′, respectively, composed of epsilon-negative (ENG) and mu-negative (MNG) single-negative (SNG) metamaterials. By tuning the layer thicknesses, the photonic band structures of PC1 and PC2 are engineered to exhibit opposite topological properties, resulting in a robust topological edge state (TES) at their interface. This TES, arising from a Zak phase discontinuity, is protected against backscattering and persists under moderate structural perturbations, enabling applications in defect-immune waveguiding and field confinement. Using transfer matrix method (TMM), we demonstrate overlapping photonic band gaps (PBGs) with opposite reflection phases, confirming the TES condition. Numerical simulations reveal two high-quality TESs at 4.473 GHz and 8.267 GHz within the first and third PBGs, respectively, with strong localization and high transmission, even in the presence of damping and geometric disorder. The low-frequency TES exhibits greater resilience to incident-angle variations and perturbations compared to the high-frequency counterpart, particularly for TM polarization. These findings highlight the potential of ENG/MNG-based topological PCs for compact, reconfigurable photonic circuits, high-Q resonators, and robust microwave or terahertz devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"569 ","pages":"Article 131271"},"PeriodicalIF":2.6,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789350","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}
Pub Date : 2025-12-14DOI: 10.1016/j.physleta.2025.131262
Le Xiong, Yuxi Ji
CuO, as well-known intrinsic multiferroics with high transition temperature, has been studied widely in past decades. The experimental reports focus on its multiferroic phase transition and property improvement, such as high-Tc and large polarization. However, theoretical investigations to illustrate microscopic multiferroic mechanism were very rare to date. In this letter, we mainly study its multiferroic coupling mechanism in polarization P and magnetization M via quantum Green’s function method, combining with first-principle calculation. By constructing two-dimension spin model, we get the ferroelectric polarization P that results from spin order change with temperature, and two magnetic phase transition points TN1 and TN2 are noted. The existed largest polarization reaches 3.2 / at high temperature phase in our two dimension magnetic structure model. Moreover, the first principle calculation demonstrates its antiferromagnetic and multiferroic features.
{"title":"Studies of magnetic ferroelectricity in two-dimensional CuO using Green’s function method","authors":"Le Xiong, Yuxi Ji","doi":"10.1016/j.physleta.2025.131262","DOIUrl":"10.1016/j.physleta.2025.131262","url":null,"abstract":"<div><div>CuO, as well-known intrinsic multiferroics with high transition temperature, has been studied widely in past decades. The experimental reports focus on its multiferroic phase transition and property improvement, such as high-<em>T</em>c and large polarization. However, theoretical investigations to illustrate microscopic multiferroic mechanism were very rare to date. In this letter, we mainly study its multiferroic coupling mechanism in polarization <em>P</em> and magnetization <em>M</em> via quantum Green’s function method, combining with first-principle calculation. By constructing two-dimension spin model, we get the ferroelectric polarization <em>P</em> that results from spin order change with temperature, and two magnetic phase transition points <em>T</em><sub>N1</sub> and <em>T</em><sub>N2</sub> are noted. The existed largest polarization reaches 3.2 <span><math><mrow><mo>×</mo><msup><mrow><mn>10</mn></mrow><mn>2</mn></msup><mrow><mspace></mspace><mi>μ</mi><mi>C</mi></mrow></mrow></math></span>/<span><math><msup><mrow><mi>m</mi></mrow><mn>2</mn></msup></math></span> at high temperature phase in our two dimension magnetic structure model. Moreover, the first principle calculation demonstrates its antiferromagnetic and multiferroic features.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"569 ","pages":"Article 131262"},"PeriodicalIF":2.6,"publicationDate":"2025-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145760773","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}
Pub Date : 2025-12-13DOI: 10.1016/j.physleta.2025.131260
Hao Cheng , Hong-Bao Cao , Chun-Sheng Liu , Xiao-Juan Ye
The progress of anode materials integrating excellent conductivity, high charge storage, and low ion diffusion resistance is essential to enhance the performance of metal-ion batteries. In this study, density functional theory (DFT) simulations are carried out to systematically investigate the B5C8 monolayer as an anode candidate for Na, K, and Ca ion storage. The metallic B5C8 sheet exhibits low diffusion barriers for ion transport (0.44 eV for Na, 0.30 eV for K, and 0.93 eV for Ca). In addition, it provides large theoretical storage capacities (2138.4 mAh g-1 for Na and K, and 4276.8 mAh g-1 for Ca) as well as appropriate open-circuit voltages (0.60 V, 0.74 V, and 0.44 V for Na/K/Ca, respectively). Molecular dynamics tests performed at 300 K verify that the B5C8 framework maintains structural integrity even when saturated with metal atoms. Moreover, when fully occupied by ions, the system undergoes only slight volume variations (0.83 % for Na, 0.61 % for K, and -0.99 % for Ca). Introducing vacancy defects not only provides additional adsorption sites but also facilitates ion migration by reducing the diffusion barriers. Taken together, these advantages indicate that B5C8 is a strong contender for future metal-ion battery anode applications.
研究集优异导电性、高电荷存储性和低离子扩散阻力于一体的阳极材料是提高金属离子电池性能的必要条件。在这项研究中，密度泛函理论（DFT）模拟进行了系统地研究B5C8单层作为Na， K和Ca离子存储的阳极候选。金属B5C8薄片具有较低的离子传输扩散势垒（Na为0.44 eV， K为0.30 eV， Ca为0.93 eV）。此外，它还提供了大的理论存储容量（Na和K为2138.4 mAh g-1， Ca为4276.8 mAh g-1）以及合适的开路电压（Na/K/Ca分别为0.60 V， 0.74 V和0.44 V）。在300 K下进行的分子动力学测试证实，即使在金属原子饱和的情况下，B5C8框架也能保持结构完整性。此外，当离子完全占据时，体系的体积变化很小（Na为0.83%，K为0.61%，Ca为- 0.99%）。引入空位缺陷不仅提供了额外的吸附位点，而且通过降低扩散屏障促进离子迁移。综上所述，这些优点表明B5C8是未来金属离子电池负极应用的有力竞争者。
{"title":"First-principles evaluation on metallic B5C8 as an anode material for non-lithium-ion batteries","authors":"Hao Cheng , Hong-Bao Cao , Chun-Sheng Liu , Xiao-Juan Ye","doi":"10.1016/j.physleta.2025.131260","DOIUrl":"10.1016/j.physleta.2025.131260","url":null,"abstract":"<div><div>The progress of anode materials integrating excellent conductivity, high charge storage, and low ion diffusion resistance is essential to enhance the performance of metal-ion batteries. In this study, density functional theory (DFT) simulations are carried out to systematically investigate the B<sub>5</sub>C<sub>8</sub> monolayer as an anode candidate for Na, K, and Ca ion storage. The metallic B<sub>5</sub>C<sub>8</sub> sheet exhibits low diffusion barriers for ion transport (0.44 eV for Na, 0.30 eV for K, and 0.93 eV for Ca). In addition, it provides large theoretical storage capacities (2138.4 mAh g<sup>-1</sup> for Na and K, and 4276.8 mAh g<sup>-1</sup> for Ca) as well as appropriate open-circuit voltages (0.60 V, 0.74 V, and 0.44 V for Na/K/Ca, respectively). Molecular dynamics tests performed at 300 K verify that the B<sub>5</sub>C<sub>8</sub> framework maintains structural integrity even when saturated with metal atoms. Moreover, when fully occupied by ions, the system undergoes only slight volume variations (0.83 % for Na, 0.61 % for K, and -0.99 % for Ca). Introducing vacancy defects not only provides additional adsorption sites but also facilitates ion migration by reducing the diffusion barriers. Taken together, these advantages indicate that B<sub>5</sub>C<sub>8</sub> is a strong contender for future metal-ion battery anode applications.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"569 ","pages":"Article 131260"},"PeriodicalIF":2.6,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145760772","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}
Pub Date : 2025-12-13DOI: 10.1016/j.physleta.2025.131251
Elham A. Aldufeery
This study theoretically investigates the plasmonic behavior of coupled silver triangular nanoprism dimers using Electron Energy Loss Spectroscopy (EELS) simulations, comparing three distinct configurations: solid-solid (SSND), hollow-hollow (HHND), and asymmetric solid-hollow (SHND). The results show that the primary plasmon resonance in the hollow dimer is significantly redshifted compared to the solid dimer due to reduced tip polarizability. The asymmetric dimer exhibits an intermediate resonance resulting from plasmon hybridization. Most importantly, the structural asymmetry in the SHND localizes energy, confining specific modes to either the solid or hollow component. This unique property allows these asymmetric dimers to function as directional nanoantennas or selective “nanoreactors.” This research provides a valuable framework for designing complex plasmonic structures with on-demand optical properties for applications like enhanced spectroscopy and photocatalysis.
{"title":"Probing plasmonic coupling and symmetry breaking in silver nanoprism dimers","authors":"Elham A. Aldufeery","doi":"10.1016/j.physleta.2025.131251","DOIUrl":"10.1016/j.physleta.2025.131251","url":null,"abstract":"<div><div>This study theoretically investigates the plasmonic behavior of coupled silver triangular nanoprism dimers using Electron Energy Loss Spectroscopy (EELS) simulations, comparing three distinct configurations: solid-solid (SSND), hollow-hollow (HHND), and asymmetric solid-hollow (SHND). The results show that the primary plasmon resonance in the hollow dimer is significantly redshifted compared to the solid dimer due to reduced tip polarizability. The asymmetric dimer exhibits an intermediate resonance resulting from plasmon hybridization. Most importantly, the structural asymmetry in the SHND localizes energy, confining specific modes to either the solid or hollow component. This unique property allows these asymmetric dimers to function as directional nanoantennas or selective “nanoreactors.” This research provides a valuable framework for designing complex plasmonic structures with on-demand optical properties for applications like enhanced spectroscopy and photocatalysis.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"569 ","pages":"Article 131251"},"PeriodicalIF":2.6,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789470","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}
Pub Date : 2025-12-11DOI: 10.1016/j.physleta.2025.131241
Leonardo S. Lima
We investigate the interplay between quantum entanglement and transport phenomena in a noninteracting bosonic system described by the topological magnon insulator compound V2WS4. In particular, we analyze how entanglement measures namely, the entanglement negativity EN (relevant for mixed states) and the entanglement entropy respond to the presence of a nearest-neighbor Dzyaloshinskii-Moriya interaction (DMI) and out-of-plane easy axis anisotropy. The DMI generates an emergent gauge flux that breaks pseudospin time-reversal symmetry, thereby stabilizing a topological magnon insulator (TMI) phase characterized by a finite Chern number and a nontrivial magnon Hall effect. Moreover, it leads to an exotic Chern insulating (CI) regime in the bosonic spectrum. Our central focus is to quantify the impact of these topological transitions on quantum correlations. We compute EN as a function of temperature, DMI strength, and single-ion anisotropy, aiming to correlate variations in the magnon band topology with signatures in mixed-state entanglement. This allows us to probe how the emergence of chiral edge magnons and band inversions influence the structure of nonclassical correlations in topological magnon systems.
{"title":"Interplay of entanglement measures and transport phenomena in a two-dimensional topological magnon insulator","authors":"Leonardo S. Lima","doi":"10.1016/j.physleta.2025.131241","DOIUrl":"10.1016/j.physleta.2025.131241","url":null,"abstract":"<div><div>We investigate the interplay between quantum entanglement and transport phenomena in a noninteracting bosonic system described by the topological magnon insulator compound V<sub>2</sub>WS<sub>4</sub>. In particular, we analyze how entanglement measures namely, the entanglement negativity <em>E<sub>N</sub></em> (relevant for mixed states) and the entanglement entropy respond to the presence of a nearest-neighbor Dzyaloshinskii-Moriya interaction (DMI) and out-of-plane easy axis anisotropy. The DMI generates an emergent gauge flux that breaks pseudospin time-reversal symmetry, thereby stabilizing a topological magnon insulator (TMI) phase characterized by a finite Chern number and a nontrivial magnon Hall effect. Moreover, it leads to an exotic Chern insulating (CI) regime in the bosonic spectrum. Our central focus is to quantify the impact of these topological transitions on quantum correlations. We compute <em>E<sub>N</sub></em> as a function of temperature, DMI strength, and single-ion anisotropy, aiming to correlate variations in the magnon band topology with signatures in mixed-state entanglement. This allows us to probe how the emergence of chiral edge magnons and band inversions influence the structure of nonclassical correlations in topological magnon systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"569 ","pages":"Article 131241"},"PeriodicalIF":2.6,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145760766","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}
Pub Date : 2025-12-11DOI: 10.1016/j.physleta.2025.131248
Patrick Hinrichs , Nader Inan , Douglas Singleton
We study the effect of a time-varying solenoidal vector potential for a quantum particle confined to a ring. The setup appears to be a time-varying version of the Aharonov-Bohm effect, but since the particle moves in the presence of fields, it is not strictly an Aharonov-Bohm effect. The results are similar to the ac Stark effect, but with a time-varying electric field coming from the vector potential, rather than the scalar potential. We compare and contrast the present effect with the standard ac Stark effect. The signature of this setup is the generation of quasi-energy sidebands which are observable via spectroscopy.
{"title":"AC Stark effect or time-dependent Aharonov-Bohm effect for particle on a ring","authors":"Patrick Hinrichs , Nader Inan , Douglas Singleton","doi":"10.1016/j.physleta.2025.131248","DOIUrl":"10.1016/j.physleta.2025.131248","url":null,"abstract":"<div><div>We study the effect of a time-varying solenoidal vector potential for a quantum particle confined to a ring. The setup appears to be a time-varying version of the Aharonov-Bohm effect, but since the particle moves in the presence of fields, it is not strictly an Aharonov-Bohm effect. The results are similar to the ac Stark effect, but with a time-varying electric field coming from the vector potential, rather than the scalar potential. We compare and contrast the present effect with the standard ac Stark effect. The signature of this setup is the generation of quasi-energy sidebands which are observable via spectroscopy.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"569 ","pages":"Article 131248"},"PeriodicalIF":2.6,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789413","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}
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