Pub Date : 2026-01-15DOI: 10.1016/j.physleta.2026.131370
Miguel A. Medina-Armendariz , Rubab Shabir , Guo-Hua Sun , Shi-Hai Dong
We investigate quantum control in a hybrid optomechanical system consisting of a V-type three-level atom, an optical cavity, and a mechanical resonator, operating under non-resonant driving conditions. Through radiation-pressure coupling, the mechanical oscillator mediates the interaction between the atomic and photonic subsystems, enabling the generation of robust multipartite entanglement. A master-equation analysis uncovers a novel parameter regime characterized by pronounced mechanical squeezing and high-fidelity quantum state transfer. In particular, the squeezed state of the mechanical oscillator, produced via coupling to a squeezed phononic reservoir, is periodically mapped onto the thermal cavity field. Our results demonstrate that nonclassical states–such as squeezed states–can be transferred periodically and with high efficiency under low thermal excitation, highlighting the coherence-preserving capabilities of the proposed protocol.
{"title":"Study of squeezing and entanglement dynamics in a non-resonant three-level atom–optomechanical hybrid system","authors":"Miguel A. Medina-Armendariz , Rubab Shabir , Guo-Hua Sun , Shi-Hai Dong","doi":"10.1016/j.physleta.2026.131370","DOIUrl":"10.1016/j.physleta.2026.131370","url":null,"abstract":"<div><div>We investigate quantum control in a hybrid optomechanical system consisting of a <em>V</em>-type three-level atom, an optical cavity, and a mechanical resonator, operating under non-resonant driving conditions. Through radiation-pressure coupling, the mechanical oscillator mediates the interaction between the atomic and photonic subsystems, enabling the generation of robust multipartite entanglement. A master-equation analysis uncovers a novel parameter regime characterized by pronounced mechanical squeezing and high-fidelity quantum state transfer. In particular, the squeezed state of the mechanical oscillator, produced via coupling to a squeezed phononic reservoir, is periodically mapped onto the thermal cavity field. Our results demonstrate that nonclassical states–such as squeezed states–can be transferred periodically and with high efficiency under low thermal excitation, highlighting the coherence-preserving capabilities of the proposed protocol.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131370"},"PeriodicalIF":2.6,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026236","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}
High figure of merit (FoM) sensing relies on the field localization effects created by metasurface designs. The Bound State in the Continuum (BIC) must be broken into a quasi-BIC to leverage its ability to enhance light-matter interaction. This paper proposes a tetramer-based all-dielectric metasurface operating in the near-infrared band, which achieves the transition from a BIC to a quasi-BIC mode by breaking specific structural symmetries. We employ multipolar decomposition theory to reveal the nature of its resonance mode. Through numerical calculations, we analyze in detail the coupling relationship between the discrete eigenmode and the external continuum during the symmetry-breaking process. Furthermore, the optical properties of the excited high-Q quasi-BIC are analyzed using the time-domain coupled-mode theory. Structural parameters are optimized to obtain superior sensing characteristics. The metasurface structure proposed herein can be utilized for designing high-FoM sensors and holds significant application prospects in fields such as biomedical health monitoring.
{"title":"Realization of high-figure-of-merit sensing on tetrameric all-dielectric metasurfaces: Excitation of quasi-BIC through symmetry breaking","authors":"Ying Chen, Zhongyao Wang, Haoliang Zhou, Zhe Han, Xin Luo, Liyong Niu, Dandan Zhu","doi":"10.1016/j.physleta.2026.131378","DOIUrl":"10.1016/j.physleta.2026.131378","url":null,"abstract":"<div><div>High figure of merit (FoM) sensing relies on the field localization effects created by metasurface designs. The Bound State in the Continuum (BIC) must be broken into a quasi-BIC to leverage its ability to enhance light-matter interaction. This paper proposes a tetramer-based all-dielectric metasurface operating in the near-infrared band, which achieves the transition from a BIC to a quasi-BIC mode by breaking specific structural symmetries. We employ multipolar decomposition theory to reveal the nature of its resonance mode. Through numerical calculations, we analyze in detail the coupling relationship between the discrete eigenmode and the external continuum during the symmetry-breaking process. Furthermore, the optical properties of the excited high-<em>Q</em> quasi-BIC are analyzed using the time-domain coupled-mode theory. Structural parameters are optimized to obtain superior sensing characteristics. The metasurface structure proposed herein can be utilized for designing high-FoM sensors and holds significant application prospects in fields such as biomedical health monitoring.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131378"},"PeriodicalIF":2.6,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039612","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 : 2026-01-14DOI: 10.1016/j.physleta.2026.131373
Chuanfu Li , Haoxuan Li , Zhenjie Su , Honggang Zhang , Ping Wang , Liufang Chen , Yangshun Lan , Chunfeng Dong
One key characteristic of an intriguing moiré superlattice formed by interlayer-twisted bilayer material is the emergence of low-energy ultra-flat bands. The stability of such band flattening effect should be evaluated for practical applications. An interlayer-twisted α-In2Se3 bilayer with end-to-end antiferroelectric polarization (AFE-1-α-In2Se3 moiré superlattice) exhibits ultra-flat top valence band that is insensitive to the moiré period due to strong localization of electronic states near the interlayer interfaces. Here, we investigate the stability of the band flattening effect in AFE-1-α-In2Se3 moiré superlattice against In/Se vacancies, using a simple defect model based on first-principles calculations. The results reveal that the band flattening effect remains robust, although vacancies modulate the electronic states. This robustness primarily originates from negative charges localized near the interlayer interfaces, emphasizing the key role of interface-localized electronic states in sustaining band flattening effect and demonstrating the potential of such band flattening effect in AFE-1-α-In2Se3 moiré superlattice for practical applications.
{"title":"The stability of band flattening effect against In/Se vacancy in antiferroelectric α-In2Se3 bilayer moiré superlattice","authors":"Chuanfu Li , Haoxuan Li , Zhenjie Su , Honggang Zhang , Ping Wang , Liufang Chen , Yangshun Lan , Chunfeng Dong","doi":"10.1016/j.physleta.2026.131373","DOIUrl":"10.1016/j.physleta.2026.131373","url":null,"abstract":"<div><div>One key characteristic of an intriguing moiré superlattice formed by interlayer-twisted bilayer material is the emergence of low-energy ultra-flat bands. The stability of such band flattening effect should be evaluated for practical applications. An interlayer-twisted α-In<sub>2</sub>Se<sub>3</sub> bilayer with end-to-end antiferroelectric polarization (AFE-1-α-In<sub>2</sub>Se<sub>3</sub> moiré superlattice) exhibits ultra-flat top valence band that is insensitive to the moiré period due to strong localization of electronic states near the interlayer interfaces. Here, we investigate the stability of the band flattening effect in AFE-1-α-In<sub>2</sub>Se<sub>3</sub> moiré superlattice against In/Se vacancies, using a simple defect model based on first-principles calculations. The results reveal that the band flattening effect remains robust, although vacancies modulate the electronic states. This robustness primarily originates from negative charges localized near the interlayer interfaces, emphasizing the key role of interface-localized electronic states in sustaining band flattening effect and demonstrating the potential of such band flattening effect in AFE-1-α-In<sub>2</sub>Se<sub>3</sub> moiré superlattice for practical applications.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131373"},"PeriodicalIF":2.6,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981956","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 : 2026-01-14DOI: 10.1016/j.physleta.2026.131368
Duong Dai Phuong , Hua Xuan Dat
Beryllium (Be) is an alkaline earth metal that plays an important role in the aerospace and nuclear industries. Today, with advanced and modern technology, scientists have discovered that Be exists in two phases: body-centred cubic (BCC) and hexagonal close-packed (HCP). The BCC - Be is stable under extreme conditions up to 1000 GPa. The phase transition pressure of Be from the hexagonal close-packed (HCP) structure to the body-centred cubic (BCC) structure occurs within the range of 386 GPa at T = 300 K. Here, we use the statistical moment method to construct the equation of state and the multiphase thermodynamic properties of Be at high pressures. And, we determine the phase-transition pressure of Be through the Gibbs thermodynamic potential, along with structural and thermodynamic quantities such as density, volume, thermal expansion coefficient, entropy, isochoric and isobaric heat capacities, and the Debye temperature of Be, while fully accounting for the influence of anharmonic effects. Combined with the Lindemann criterion, we calculate and determine the solid-liquid phase transition boundary of Be up to 600 GPa. Our computational results are of particular significance for research programs related to the thermonuclear applications of beryllium and the development of Tokamak devices.
{"title":"The phase transition and thermodynamic properties of beryllium at high temperatures and pressures","authors":"Duong Dai Phuong , Hua Xuan Dat","doi":"10.1016/j.physleta.2026.131368","DOIUrl":"10.1016/j.physleta.2026.131368","url":null,"abstract":"<div><div>Beryllium (Be) is an alkaline earth metal that plays an important role in the aerospace and nuclear industries. Today, with advanced and modern technology, scientists have discovered that Be exists in two phases: body-centred cubic (BCC) and hexagonal close-packed (HCP). The BCC - Be is stable under extreme conditions up to 1000 GPa. The phase transition pressure of Be from the hexagonal close-packed (HCP) structure to the body-centred cubic (BCC) structure occurs within the range of 386 GPa at <em>T</em> = 300 K. Here, we use the statistical moment method to construct the equation of state and the multiphase thermodynamic properties of Be at high pressures. And, we determine the phase-transition pressure of Be through the Gibbs thermodynamic potential, along with structural and thermodynamic quantities such as density, volume, thermal expansion coefficient, entropy, isochoric and isobaric heat capacities, and the Debye temperature of Be, while fully accounting for the influence of anharmonic effects. Combined with the Lindemann criterion, we calculate and determine the solid-liquid phase transition boundary of Be up to 600 GPa. Our computational results are of particular significance for research programs related to the thermonuclear applications of beryllium and the development of Tokamak devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131368"},"PeriodicalIF":2.6,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039609","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 : 2026-01-14DOI: 10.1016/j.physleta.2026.131341
Muhammad Hamza Rafiq , Muhammad Naveed Rafiq , Ji Lin
Nonlinear localized structures have attracted considerable attention in various physical fields, such as nonlinear optics, Bose-Einstein condensates and fluid dynamics. This study aims to establish the breather, soliton-breather interaction, higher-order smooth positons and breather positons from the N-soliton solutions of nonlocal Boussinesq equations with the Hirota bilinear method through a limiting approach. To extend this, theoretical results are confirmed by the graphical illustration using surface, density and line plots under relevant parameter values, highlighting their dynamical behavior and order of structure. Moreover, the effect of the physical parameter is studied, demonstrating that the localized wave packets switch their phase shift in response to variations in amplitude and spatial intensity. These findings are original and novel for the nonlocal Boussinesq equations in shallow water applications and these are the motivations for this work.
{"title":"Nonlinear localized waves and positon solutions for nonlocal Boussinesq equations in shallow water applications","authors":"Muhammad Hamza Rafiq , Muhammad Naveed Rafiq , Ji Lin","doi":"10.1016/j.physleta.2026.131341","DOIUrl":"10.1016/j.physleta.2026.131341","url":null,"abstract":"<div><div>Nonlinear localized structures have attracted considerable attention in various physical fields, such as nonlinear optics, Bose-Einstein condensates and fluid dynamics. This study aims to establish the breather, soliton-breather interaction, higher-order smooth positons and breather positons from the <em>N</em>-soliton solutions of nonlocal Boussinesq equations with the Hirota bilinear method through a limiting approach. To extend this, theoretical results are confirmed by the graphical illustration using surface, density and line plots under relevant parameter values, highlighting their dynamical behavior and order of structure. Moreover, the effect of the physical parameter is studied, demonstrating that the localized wave packets switch their phase shift in response to variations in amplitude and spatial intensity. These findings are original and novel for the nonlocal Boussinesq equations in shallow water applications and these are the motivations for this work.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131341"},"PeriodicalIF":2.6,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981950","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}
The discharge channel width is a critical design parameter for Hall effect thrusters, yet its influence on the cross-field electron transport governed by plasma instabilities remains inadequately understood, especially when wall absorption is included. The influence of the discharge channel width is investigated using 2D radial-azimuthal particle-in-cell (PIC) simulations with absorbing wall boundaries and an analytic ionization model. The channel width is varied from 3.2 mm to 25.6 mm. We find a non-monotonic dependence of linear instability growth rate on . The ECDI-1st linear growth rate increases, then decreases (notably at and 19.2 mm), and rises again at 25.6 mm. The MTSI exhibits a similar -dependence with a pronounced reduction at . Wider channels enhance nonlinear activity, inducing spectrum broadening and a transition from discrete ECDI-dominated oscillations to a broadband state where MTSI becomes dominant. Consequently, the radial electron temperature increases from ∼ 10 eV () to ∼ 47 eV (), reversing the temperature anisotropy (from Teθ > Ter in narrow channels to Teθ < Ter in wide channels). The time-averaged electron mobility in the plasma bulk is suppressed as increases (reduction > 25% in the present parameter set). These results suggest that, with the plasma source fixed, the increase of due to the wall-induced particle losses and enhanced nonlinear coupling substantially modifies instability development and anomalous transport.
放电通道宽度是霍尔效应推力器的一个关键设计参数，但其对等离子体不稳定性控制的跨场电子输运的影响仍然没有得到充分的了解，特别是当包括壁面吸收时。采用具有吸收壁边界和解析电离模型的二维径向-方位池内粒子（PIC）模拟研究了放电通道宽度的影响。通道宽度Lr在3.2 mm ~ 25.6 mm之间变化。我们发现线性不稳定性增长率与Lr有非单调的关系。ecdi -1线性增长率先上升，后下降（Lr=12.8和19.2 mm时尤为明显），在25.6 mm时再次上升。MTSI表现出类似的Lr依赖性，在Lr=19.2mm时显著降低。更宽的信道增强了非线性活动，诱导频谱展宽，并从离散ecdi主导的振荡过渡到MTSI成为主导的宽带状态。因此，径向电子温度Ter从 ~ 10 eV （Lr=3.2mm）增加到 ~ 47 eV (Lr=25.6mm)，逆转了温度各向异性（从窄通道的Teθ >； Ter到宽通道的Teθ <； Ter）。等离子体体中的时间平均电子迁移率随着Lr的增加而受到抑制（在当前参数集中降低 >； 25%）。这些结果表明，在等离子体源固定的情况下，由于壁面引起的粒子损失和非线性耦合的增强，Lr的增加大大改变了不稳定性的发展和异常输运。
{"title":"Influence of the channel width on hall thruster instabilities by 2D radial-azimuthal particle-in-cell simulations","authors":"Xin Luo , Zhijun Zhou , Lihuan Xie , Yixiang Peng , Fengkui Zhang , Yinjian Zhao","doi":"10.1016/j.physleta.2026.131366","DOIUrl":"10.1016/j.physleta.2026.131366","url":null,"abstract":"<div><div>The discharge channel width is a critical design parameter for Hall effect thrusters, yet its influence on the cross-field electron transport governed by plasma instabilities remains inadequately understood, especially when wall absorption is included. The influence of the discharge channel width is investigated using 2D radial-azimuthal particle-in-cell (PIC) simulations with absorbing wall boundaries and an analytic ionization model. The channel width <span><math><msub><mi>L</mi><mtext>r</mtext></msub></math></span> is varied from 3.2 mm to 25.6 mm. We find a non-monotonic dependence of linear instability growth rate on <span><math><msub><mi>L</mi><mtext>r</mtext></msub></math></span>. The ECDI-1st linear growth rate increases, then decreases (notably at <span><math><mrow><msub><mi>L</mi><mtext>r</mtext></msub><mo>=</mo><mn>12.8</mn></mrow></math></span> and 19.2 mm), and rises again at 25.6 mm. The MTSI exhibits a similar <span><math><msub><mi>L</mi><mtext>r</mtext></msub></math></span>-dependence with a pronounced reduction at <span><math><mrow><msub><mi>L</mi><mtext>r</mtext></msub><mo>=</mo><mn>19.2</mn><mspace></mspace><mtext>mm</mtext></mrow></math></span>. Wider channels enhance nonlinear activity, inducing spectrum broadening and a transition from discrete ECDI-dominated oscillations to a broadband state where MTSI becomes dominant. Consequently, the radial electron temperature <span><math><mrow><msub><mi>T</mi><mtext>e</mtext></msub><mspace></mspace><mtext>r</mtext></mrow></math></span> increases from ∼ 10 eV (<span><math><mrow><msub><mi>L</mi><mtext>r</mtext></msub><mo>=</mo><mn>3.2</mn><mspace></mspace><mtext>mm</mtext></mrow></math></span>) to ∼ 47 eV (<span><math><mrow><msub><mi>L</mi><mtext>r</mtext></msub><mo>=</mo><mn>25.6</mn><mspace></mspace><mtext>mm</mtext></mrow></math></span>), reversing the temperature anisotropy (from <em>T<sub>eθ</sub></em> > <em>T</em><sub>er</sub> in narrow channels to <em>T<sub>eθ</sub></em> < <em>T</em><sub>er</sub> in wide channels). The time-averaged electron mobility in the plasma bulk is suppressed as <span><math><msub><mi>L</mi><mtext>r</mtext></msub></math></span> increases (reduction > 25% in the present parameter set). These results suggest that, with the plasma source fixed, the increase of <span><math><msub><mi>L</mi><mtext>r</mtext></msub></math></span> due to the wall-induced particle losses and enhanced nonlinear coupling substantially modifies instability development and anomalous transport.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131366"},"PeriodicalIF":2.6,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981954","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 : 2026-01-13DOI: 10.1016/j.physleta.2026.131367
Yukio Watanabe
We used density functional theories (DFT) to investigate the properties of Au2O and Au2O3-x (x = 0–0.08) to reveal their remarkable functionikalities. Hybrid functional theories accurately estimate the band gap (Eg) of oxides, and the present hybrid functional calculations determined Eg values of 0.96 eV for Au2O and 2.86 eV for Au2O3, which is >300% of the commonly accepted Eg of Au2O3 (0.85 eV). Moreover, we discovered spontaneous polarization (PS) in Au2O3, which is unusually large and advantageous for catalysis. The PS was retained even in 2-nm-thick Au2O3 nanosheets, similar to hyperferroelectric, generating a potential of 0.6 eV despite screening caused by surface reconstruction, which is a novel screening mechanism. Below a thickness of 0.8 nm, the PS vanished, and inversion symmetry emerged at 0.4 nm, suggesting a new approach to finding a paraelectric phase. Au2O was supersoft under shear distortion.
{"title":"Functionalities of Au2O, Au2O3, Au2O3-x, and nanosheets, including spontaneous polarization, using DFT and hybrid functional","authors":"Yukio Watanabe","doi":"10.1016/j.physleta.2026.131367","DOIUrl":"10.1016/j.physleta.2026.131367","url":null,"abstract":"<div><div>We used density functional theories (DFT) to investigate the properties of Au<sub>2</sub>O and Au<sub>2</sub>O<sub>3-</sub><em><sub>x</sub></em> (<em>x</em> = 0–0.08) to reveal their remarkable functionikalities. Hybrid functional theories accurately estimate the band gap (<em>E</em><sub>g</sub>) of oxides, and the present hybrid functional calculations determined <em>E</em><sub>g</sub> values of 0.96 eV for Au<sub>2</sub>O and 2.86 eV for Au<sub>2</sub>O<sub>3</sub>, which is >300% of the commonly accepted <em>E</em><sub>g</sub> of Au<sub>2</sub>O<sub>3</sub> (0.85 eV). Moreover, we discovered spontaneous polarization (<em>P</em><sub>S</sub>) in Au<sub>2</sub>O<sub>3</sub>, which is unusually large and advantageous for catalysis. The <em>P</em><sub>S</sub> was retained even in 2-nm-thick Au<sub>2</sub>O<sub>3</sub> nanosheets, similar to hyperferroelectric, generating a potential of 0.6 eV despite screening caused by surface reconstruction, which is a novel screening mechanism. Below a thickness of 0.8 nm, the <em>P</em><sub>S</sub> vanished, and inversion symmetry emerged at 0.4 nm, suggesting a new approach to finding a paraelectric phase. Au<sub>2</sub>O was supersoft under shear distortion.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131367"},"PeriodicalIF":2.6,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079962","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 : 2026-01-13DOI: 10.1016/j.physleta.2026.131369
Pengfei Wu , Zetong Wang , Sichen Lei , Xiaofan Wang , Zhenkun Tan , Jiao Wang , Yiwei Sun
To address the mode recognition challenges of fractional cylindrical vector beams (FCVBs) under atmospheric turbulence, including spot diffusion, uneven energy distribution, deformation of ring or stripe structures, and strong similarity between conjugate fractional orders, a model named FMSTA-Net is proposed. This network, combined with a Multi-Scale Turbulence-Aware Attention (MSTA) module, which innovatively integrates hierarchical feature extraction across point, local, medium-range, and global scales, effectively captures both fine-grained distortions and global structural dependencies under varying turbulence conditions. Experimental results demonstrate that, under six atmospheric turbulence levels with refractive index structure constants ranging from to , the model achieves a recognition accuracy of 99.3 % for FCVBs within the OAM range of [±3.1, ±4.0] transmitted over a distance of 1000 meters. In classification tasks with order intervals of 0.05 and 0.15, accuracies of 96.4 % and 98.4 %, respectively, are achieved. Furthermore, on additional test sets at transmission distances of 750 m and 1250 m, FMSTA-Net attains recognition accuracies of 99.2 % and 95.4 %, demonstrating excellent generalization capability and robustness for practical deployment in turbulent atmospheric channels.
{"title":"FMSTA-Net: Fractional mode recognition of cylindrical vector beams via multi-scale turbulence-aware learning and polarization analysis","authors":"Pengfei Wu , Zetong Wang , Sichen Lei , Xiaofan Wang , Zhenkun Tan , Jiao Wang , Yiwei Sun","doi":"10.1016/j.physleta.2026.131369","DOIUrl":"10.1016/j.physleta.2026.131369","url":null,"abstract":"<div><div>To address the mode recognition challenges of fractional cylindrical vector beams (FCVBs) under atmospheric turbulence, including spot diffusion, uneven energy distribution, deformation of ring or stripe structures, and strong similarity between conjugate fractional orders, a model named FMSTA-Net is proposed. This network, combined with a Multi-Scale Turbulence-Aware Attention (MSTA) module, which innovatively integrates hierarchical feature extraction across point, local, medium-range, and global scales, effectively captures both fine-grained distortions and global structural dependencies under varying turbulence conditions. Experimental results demonstrate that, under six atmospheric turbulence levels with refractive index structure constants ranging from <span><math><mrow><msubsup><mi>C</mi><mi>n</mi><mn>2</mn></msubsup><mo>=</mo><mn>1</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>16</mn></mrow></msup><msup><mrow><mi>m</mi></mrow><mrow><mo>−</mo><mn>2</mn><mo>/</mo><mn>3</mn></mrow></msup></mrow></math></span> to <span><math><mrow><msubsup><mi>C</mi><mi>n</mi><mn>2</mn></msubsup><mo>=</mo><mn>5</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>14</mn></mrow></msup><msup><mrow><mi>m</mi></mrow><mrow><mo>−</mo><mn>2</mn><mo>/</mo><mn>3</mn></mrow></msup></mrow></math></span>, the model achieves a recognition accuracy of 99.3 % for FCVBs within the OAM range of [±3.1, ±4.0] transmitted over a distance of 1000 meters. In classification tasks with order intervals of 0.05 and 0.15, accuracies of 96.4 % and 98.4 %, respectively, are achieved. Furthermore, on additional test sets at transmission distances of 750 m and 1250 m, FMSTA-Net attains recognition accuracies of 99.2 % and 95.4 %, demonstrating excellent generalization capability and robustness for practical deployment in turbulent atmospheric channels.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131369"},"PeriodicalIF":2.6,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981952","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 : 2026-01-12DOI: 10.1016/j.physleta.2026.131364
Salma Alshehri , G.S. AlGhamdi , Fatmah A. Al-Marhaby , Dalal S. Bayahia , Badriah Sultan , M.D. Alshahrani , Saleha Qissi , Zaina S. Algarni , Faten A.M. Abdelaziz , Mohammad Shariq
This work investigates the dielectric, magnetic, and magneto-dielectric properties of the monoclinic bulk double perovskite Pr2NiMnO6 (PNMO) as a function of frequency and temperature. Below 100 K, the dielectric permittivity remains nearly frequency-independent, while increasing temperature gives rise to distinct relaxation peaks within 997 Hz to 997,999 Hz. The dielectric loss (tan δ) spectra display progressively enhanced peak intensities between 112 K and 197 K, revealing a frequency-dependent relaxation process. These sharp relaxation features indicate a relaxor-like dielectric behavior, primarily arising from molecular dipoles in PNMO. The relaxation dynamics are attributed to electron hopping between transition-metal ions, consistent with the Maxwell–Wagner interfacial polarization model. Cole–Cole fitting analysis further provides insights into dielectric strength, conductivity, and distribution parameters. The interplay of dielectric and magneto-dielectric responses underscores PNMO’s potential for multifunctional applications, including spintronic devices, sensors, and energy storage systems, where coupled electric and magnetic functionalities are desirable.
{"title":"Exploring magnetic, dielectric relaxation and magneto-dielectric coupling in monoclinic double perovskite Pr2NiMnO6","authors":"Salma Alshehri , G.S. AlGhamdi , Fatmah A. Al-Marhaby , Dalal S. Bayahia , Badriah Sultan , M.D. Alshahrani , Saleha Qissi , Zaina S. Algarni , Faten A.M. Abdelaziz , Mohammad Shariq","doi":"10.1016/j.physleta.2026.131364","DOIUrl":"10.1016/j.physleta.2026.131364","url":null,"abstract":"<div><div>This work investigates the dielectric, magnetic, and magneto-dielectric properties of the monoclinic bulk double perovskite Pr<sub>2</sub>NiMnO<sub>6</sub> (PNMO) as a function of frequency and temperature. Below 100 K, the dielectric permittivity remains nearly frequency-independent, while increasing temperature gives rise to distinct relaxation peaks within 997 Hz to 997,999 Hz. The dielectric loss (tan δ) spectra display progressively enhanced peak intensities between 112 K and 197 K, revealing a frequency-dependent relaxation process. These sharp relaxation features indicate a relaxor-like dielectric behavior, primarily arising from molecular dipoles in PNMO. The relaxation dynamics are attributed to electron hopping between transition-metal ions, consistent with the Maxwell–Wagner interfacial polarization model. Cole–Cole fitting analysis further provides insights into dielectric strength, conductivity, and distribution parameters. The interplay of dielectric and magneto-dielectric responses underscores PNMO’s potential for multifunctional applications, including spintronic devices, sensors, and energy storage systems, where coupled electric and magnetic functionalities are desirable.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131364"},"PeriodicalIF":2.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039615","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 : 2026-01-12DOI: 10.1016/j.physleta.2026.131365
Xiuping Guo , Zujun Li , Junhao Peng , Huafeng Dong , Renhai Wang , Yujue Yang , Fugen Wu
Two-dimensional piezoelectric materials hold tremendous promise for flexible nanoelectronics, owing to their ultra-thin atomic thickness, outstanding mechanical properties, and excellent tunability. In this study, we employ first-principles calculations to systematically investigate the piezoelectric properties of TiA₂X₄ (A = Ga, Al; X = S, Se, Te) monolayers. Our results reveal that the piezoelectric coefficient d11 of monolayer TiA₂X₄ ranges from 5.04 to 7.33 pm/V, showcasing enhanced piezoelectric performance compared to other two-dimensional materials in the MA₂N₄ family, such as MoSi₂N₄ (d11 = 1.145 pm/V) and TiSi₂N₄ (d11 = 0.831 pm/V). This enhanced piezoelectric response is likely attributed to the relatively low elastic constants of TiA₂X₄. The Young’s modulus of the monolayer TiA₂X₄ ranges from 85.4 to 141.76 N/m, suggesting favorable mechanical flexibility. Additionally, we also computed the stability, electronic, and thermodynamics properties of the TiA2×4 (A = Ga, Al; X = S, Se, Te) monolayers. These findings provide crucial insights for the design of TiA2×4 monolayers for applications in flexible nanoelectronic devices and wearable sensors.
二维压电材料由于其超薄的原子厚度、优异的机械性能和优异的可调性，在柔性纳米电子学领域具有巨大的前景。在本研究中，我们采用第一性原理计算系统地研究了tia2x₄（A = Ga, Al; X = S, Se, Te）单层的压电性能。我们的研究结果表明，单层TiA₂X₄的压电系数d11在5.04 ~ 7.33 pm/V之间，与MA₂N₄家族中的其他二维材料(如MoSi₂N₄（d11 = 1.145 pm/V）和TiSi₂N₄（d11 = 0.831 pm/V）相比，具有更高的压电性能。这种增强的压电响应可能归因于TiA₂X₄相对较低的弹性常数。单层TiA₂X₄的杨氏模量为85.4 ~ 141.76 N/m，具有良好的机械柔韧性。此外，我们还计算了TiA2×4 （A = Ga, Al; X = S, Se, Te）单层的稳定性，电子和热力学性质。这些发现为设计用于柔性纳米电子器件和可穿戴传感器的TiA2×4单层材料提供了重要的见解。
{"title":"Piezoelectric properties of novel group III-VI TiA2×4 (A = Ga, Al; X = S, Se, Te) monolayers: First-principle calculations","authors":"Xiuping Guo , Zujun Li , Junhao Peng , Huafeng Dong , Renhai Wang , Yujue Yang , Fugen Wu","doi":"10.1016/j.physleta.2026.131365","DOIUrl":"10.1016/j.physleta.2026.131365","url":null,"abstract":"<div><div>Two-dimensional piezoelectric materials hold tremendous promise for flexible nanoelectronics, owing to their ultra-thin atomic thickness, outstanding mechanical properties, and excellent tunability. In this study, we employ first-principles calculations to systematically investigate the piezoelectric properties of TiA₂X₄ (A = Ga, Al; X = S, Se, Te) monolayers. Our results reveal that the piezoelectric coefficient <em>d</em><sub>11</sub> of monolayer TiA₂X₄ ranges from 5.04 to 7.33 pm/V, showcasing enhanced piezoelectric performance compared to other two-dimensional materials in the MA₂N₄ family, such as MoSi₂N₄ (<em>d</em><sub>11</sub> = 1.145 pm/V) and TiSi₂N₄ (<em>d</em><sub>11</sub> = 0.831 pm/V). This enhanced piezoelectric response is likely attributed to the relatively low elastic constants of TiA₂X₄. The Young’s modulus of the monolayer TiA₂X₄ ranges from 85.4 to 141.76 N/m, suggesting favorable mechanical flexibility. Additionally, we also computed the stability, electronic, and thermodynamics properties of the TiA<sub>2</sub>×<sub>4</sub> (A = Ga, Al; X = S, Se, Te) monolayers. These findings provide crucial insights for the design of TiA<sub>2</sub>×<sub>4</sub> monolayers for applications in flexible nanoelectronic devices and wearable sensors.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"572 ","pages":"Article 131365"},"PeriodicalIF":2.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145980053","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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