High Q metasurfaces play an important role in fields such as high-sensitivity sensing and nonlinear optics due to their strong localized electromagnetic field enhancement. Although ultra-high Q resonance has been developed in the field of optics, it is still a challenging task due to the loss of dielectric materials, design and fabrication of nanostructures. In this paper, we have designed an all-dielectric symmetric perforated array structure that supports multiple Fano resonances within the 0–1 THz range and realizes the anapole mode through this array perforation structure. By calculating the phase difference between different modes at the resonance frequencies, we explain the mechanism of the formation of resonance-coupled BIC. The Q-factors of the three modes have been calculated, where the highest Q-value can be up to 2703, it is excited by the MQ. Then, we analyzed the sensing performance and the highest sensitivity can reach 27,000 nm/RIU. Since the metasurface always maintains symmetry and mirror symmetry, all three resonances are polarization independent. The proposed metasurfaces can be applied to light-matter interactions, enhanced nonlinear response, and sensing.
{"title":"Multiple Fano resonances in all-dielectric porous array structures","authors":"Zidong Chen , Fei Liu , Xinghai Zhao , Ailing Zhang","doi":"10.1016/j.physleta.2024.130082","DOIUrl":"10.1016/j.physleta.2024.130082","url":null,"abstract":"<div><div>High Q metasurfaces play an important role in fields such as high-sensitivity sensing and nonlinear optics due to their strong localized electromagnetic field enhancement. Although ultra-high Q resonance has been developed in the field of optics, it is still a challenging task due to the loss of dielectric materials, design and fabrication of nanostructures. In this paper, we have designed an all-dielectric symmetric perforated array structure that supports multiple Fano resonances within the 0–1 THz range and realizes the anapole mode through this array perforation structure. By calculating the phase difference between different modes at the resonance frequencies, we explain the mechanism of the formation of resonance-coupled BIC. The Q-factors of the three modes have been calculated, where the highest Q-value can be up to 2703, it is excited by the MQ. Then, we analyzed the sensing performance and the highest sensitivity can reach 27,000 nm/RIU. Since the metasurface always maintains <span><math><mrow><mi>c</mi><mo>_</mo><mn>4</mn><mi>v</mi></mrow></math></span> symmetry and mirror symmetry, all three resonances are polarization independent. The proposed metasurfaces can be applied to light-matter interactions, enhanced nonlinear response, and sensing.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130082"},"PeriodicalIF":2.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700882","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 : 2024-11-19DOI: 10.1016/j.physleta.2024.130066
C.B. Tabi , H. Tagwo , C.G. Latchio Tiofack , S.S. Veni , T.C. Kofané
The letter explores modulational instability (MI) in birefringent optical media with pure-quartic dispersion, relaxed Kerr nonlinearity, and walk-off effects. The linear stage of MI is studied using coupled biharmonic nonlinear Schrödinger equations, and the stability of their continuous wave solutions is used to calculate the growth rate of MI. The latter is then used to characterize MI under the combined effects of nonlinear responses, group-velocity mismatch, and quartic dispersion, with a focus on the pure-quartic soliton regime. The nonlinear stage of MI is also studied through direct numerical simulations, which support the analytical predictions and emphasize the impact of quartic dispersion, relaxed Kerr nonlinearity, and the walk-off effect on the emergence of various nonlinear patterns. These findings provide valuable insights into signal generation and processing in pure-quartic optical materials and have potential applications in nonlinear optics and lasers.
这封信探讨了具有纯方波色散、松弛克尔非线性和走偏效应的双折射光学介质中的调制不稳定性（MI）。利用耦合双谐波非线性薛定谔方程研究了调制不稳定性的线性阶段，并利用其连续波解的稳定性计算了调制不稳定性的增长率。然后，在非线性响应、群速失配和四分频色散的共同作用下，利用后者来描述 MI 的特征，重点是纯四分频孤子机制。此外，还通过直接数值模拟研究了 MI 的非线性阶段，这些模拟支持分析预测，并强调了四元色散、松弛克尔非线性和走偏效应对各种非线性模式出现的影响。这些发现为纯四元光学材料中的信号生成和处理提供了宝贵的见解，并有望应用于非线性光学和激光领域。
{"title":"Coupled wave instability in pure-quartic dispersive and noninstantaneous Kerr media in presence of walk-off","authors":"C.B. Tabi , H. Tagwo , C.G. Latchio Tiofack , S.S. Veni , T.C. Kofané","doi":"10.1016/j.physleta.2024.130066","DOIUrl":"10.1016/j.physleta.2024.130066","url":null,"abstract":"<div><div>The letter explores modulational instability (MI) in birefringent optical media with pure-quartic dispersion, relaxed Kerr nonlinearity, and walk-off effects. The linear stage of MI is studied using coupled biharmonic nonlinear Schrödinger equations, and the stability of their continuous wave solutions is used to calculate the growth rate of MI. The latter is then used to characterize MI under the combined effects of nonlinear responses, group-velocity mismatch, and quartic dispersion, with a focus on the pure-quartic soliton regime. The nonlinear stage of MI is also studied through direct numerical simulations, which support the analytical predictions and emphasize the impact of quartic dispersion, relaxed Kerr nonlinearity, and the walk-off effect on the emergence of various nonlinear patterns. These findings provide valuable insights into signal generation and processing in pure-quartic optical materials and have potential applications in nonlinear optics and lasers.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130066"},"PeriodicalIF":2.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700889","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 : 2024-11-19DOI: 10.1016/j.physleta.2024.130083
Huaiyuan Yin
The phenomenon of controlling far-field thermal radiation with large-angle emission has gradually attracted attention, but it was previously only present in the TM mode. The ability to make the TE mode have a similar emission trend to the TM mode is important. By introducing a grating-like phase change material:vanadium dioxide (VO2), the emitter has achieved wide-band controllable differences in TE emission rates between the two modes in the atmospheric window range (8–13 um). The range of variation in the emission rate is close to 0.9. Furthermore, temperature-controlled color displays at different angles have been added to the emitter, which makes it easier to judge the working state of the emitter visually. This adjustable broadband large-angle directional emitter makes angle-dependent thermal radiation control possible. It has potential application value in the fields of thermal camouflage, directional radiative cooling, solar cooling waste and heat recovery.
利用大角度发射控制远场热辐射的现象已逐渐引起人们的关注，但这种现象以前只出现在 TM 模式中。使 TE 模式具有与 TM 模式相似的发射趋势非常重要。通过引入一种类似光栅的相变材料：二氧化钒（VO2），发射器在大气窗口范围（8-13 um）内实现了两种模式之间 TE 发射率的宽带可控差异。发射率的变化范围接近 0.9。此外，发射器还增加了不同角度的温控彩色显示屏，使人们更容易直观地判断发射器的工作状态。这种可调式宽带大角度定向辐射器使随角度变化的热辐射控制成为可能。它在热伪装、定向辐射冷却、太阳能冷却废热回收等领域具有潜在的应用价值。
{"title":"Wide-band dual-mode adaptive angle anisotropic thermal emitter","authors":"Huaiyuan Yin","doi":"10.1016/j.physleta.2024.130083","DOIUrl":"10.1016/j.physleta.2024.130083","url":null,"abstract":"<div><div>The phenomenon of controlling far-field thermal radiation with large-angle emission has gradually attracted attention, but it was previously only present in the TM mode. The ability to make the TE mode have a similar emission trend to the TM mode is important. By introducing a grating-like phase change material:vanadium dioxide (VO<sub>2</sub>), the emitter has achieved wide-band controllable differences in TE emission rates between the two modes in the atmospheric window range (8–13 um). The range of variation in the emission rate is close to 0.9. Furthermore, temperature-controlled color displays at different angles have been added to the emitter, which makes it easier to judge the working state of the emitter visually. This adjustable broadband large-angle directional emitter makes angle-dependent thermal radiation control possible. It has potential application value in the fields of thermal camouflage, directional radiative cooling, solar cooling waste and heat recovery.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130083"},"PeriodicalIF":2.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700883","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}
Currently, the metasurface design of flexural wave is primarily based on the generalized Snell's law (GSL). However, due to GSL only considering phase gradient, high-order parasitic diffraction leads to poor performance of larger angle anomalous refraction. In this paper, to suppress parasitic diffraction, a collaborative optimal method is proposed for metasurface design. Firstly, the diffraction formula considering both phase gradient and periodicity of grating structures is derived based on the grating diffraction theory (GDT). Then, the reconfigurable metasurface constructed of ‘screw-nut’ substructures are designed in conjunction with the genetic algorithm (GA). For the vertical incident flexural wave, the anomalous refractions of medium angle 51° and large angle 77° for 6.4 kHz, as well as 90° for 6.066 kHz are considered. Finally, oblique incidence is considered, in which the improvements of collaborative optimization design methods to 1 and −1 orders anomalous refractions are analyzed separately. The results are compared with the local ones obtained by GSL. It indicates that the proposed non-local design method opens a new perspective for parasitic diffraction suppression and efficient flexural wave manipulation.
{"title":"Non-local design method of metasurface by the grating diffraction theory enabling efficient wave control","authors":"Si-Min Yuan , Tian Gao , A-Li Chen , Yue-Sheng Wang","doi":"10.1016/j.physleta.2024.130081","DOIUrl":"10.1016/j.physleta.2024.130081","url":null,"abstract":"<div><div>Currently, the metasurface design of flexural wave is primarily based on the generalized Snell's law (GSL). However, due to GSL only considering phase gradient, high-order parasitic diffraction leads to poor performance of larger angle anomalous refraction. In this paper, to suppress parasitic diffraction, a collaborative optimal method is proposed for metasurface design. Firstly, the diffraction formula considering both phase gradient and periodicity of grating structures is derived based on the grating diffraction theory (GDT). Then, the reconfigurable metasurface constructed of ‘screw-nut’ substructures are designed in conjunction with the genetic algorithm (GA). For the vertical incident flexural wave, the anomalous refractions of medium angle 51° and large angle 77° for 6.4 kHz, as well as 90° for 6.066 kHz are considered. Finally, oblique incidence is considered, in which the improvements of collaborative optimization design methods to 1 and −1 orders anomalous refractions are analyzed separately. The results are compared with the local ones obtained by GSL. It indicates that the proposed non-local design method opens a new perspective for parasitic diffraction suppression and efficient flexural wave manipulation.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130081"},"PeriodicalIF":2.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700886","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 : 2024-11-19DOI: 10.1016/j.physleta.2024.130076
Pedro Sancho
Vacuum fluctuations play a central role in spontaneous emission. Recently, it has been suggested that these fluctuations could also be fundamental in the absorption dynamics, breaking the superposition inherent to the linear quantum evolution. We analyze the consistency of that proposal with previous results in double spontaneous emission. Moreover, for the case of single absorption by two atoms, we present a test based on the time dependence of the subsequent spontaneous emission patterns, which can experimentally settle the question. This test is more viable than the original proposal, built on the Casimir effect. Our approach also allows for the comparison between the time scales of vacuum fluctuations as a disentangling mechanism and an emission trigger.
{"title":"Are vacuum fluctuations relevant in absorption dynamics?","authors":"Pedro Sancho","doi":"10.1016/j.physleta.2024.130076","DOIUrl":"10.1016/j.physleta.2024.130076","url":null,"abstract":"<div><div>Vacuum fluctuations play a central role in spontaneous emission. Recently, it has been suggested that these fluctuations could also be fundamental in the absorption dynamics, breaking the superposition inherent to the linear quantum evolution. We analyze the consistency of that proposal with previous results in double spontaneous emission. Moreover, for the case of single absorption by two atoms, we present a test based on the time dependence of the subsequent spontaneous emission patterns, which can experimentally settle the question. This test is more viable than the original proposal, built on the Casimir effect. Our approach also allows for the comparison between the time scales of vacuum fluctuations as a disentangling mechanism and an emission trigger.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130076"},"PeriodicalIF":2.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700887","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 : 2024-11-17DOI: 10.1016/j.physleta.2024.130064
Vlad-Mihai Ene, Ilinca Lianu, Ioan Grosu
We analyzed the Hartree-Fock approximation for an electron system. The interaction between particles is modeled by a non-Coulombian potential. We analyzed both the three-dimensional and two-dimensional systems. We obtained accurate analytical results for the particle energy, the particle velocity, the ground state energy of the system as well as the momentum dependent density of states. The previous classical results for the Coulombian case were reobtained as particular cases.
{"title":"Hartree-Fock approximation for non-Coulomb interactions in three and two-dimensional systems","authors":"Vlad-Mihai Ene, Ilinca Lianu, Ioan Grosu","doi":"10.1016/j.physleta.2024.130064","DOIUrl":"10.1016/j.physleta.2024.130064","url":null,"abstract":"<div><div>We analyzed the Hartree-Fock approximation for an electron system. The interaction between particles is modeled by a non-Coulombian potential. We analyzed both the three-dimensional and two-dimensional systems. We obtained accurate analytical results for the particle energy, the particle velocity, the ground state energy of the system as well as the momentum dependent density of states. The previous classical results for the Coulombian case were reobtained as particular cases.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130064"},"PeriodicalIF":2.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700994","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 : 2024-11-17DOI: 10.1016/j.physleta.2024.130063
Zhi-Lei Zhang , Guo-Jian Qiao , C.P. Sun
We revisit the Feynman approach to the Josephson effect, which employs a pair of linear coupling equations for its modeling. It is found that while the exact solutions can account for the AC Josephson effect when the coupling strength is significantly less than the voltage, they fail to produce the DC Josephson effect in any practical scenario. To address this fundamental discrepancy, we derive the coupled Ginzburg-Landau (GL) equations for two interconnected superconductors based on BCS theory. These equations reveal that the nonlinear coupling, which is overlooked in the Feynman approach, is crucial in describing the spontaneous symmetry breaking in superconductors, a critical factor for achieving the DC Josephson effect. When the coupled GL equations are applied to a double junction, a sawtooth current pattern emerges, a result unattainable via the Feynman approach.
{"title":"Feynman paradox about the Josephson effect and a sawtooth current in the double junction","authors":"Zhi-Lei Zhang , Guo-Jian Qiao , C.P. Sun","doi":"10.1016/j.physleta.2024.130063","DOIUrl":"10.1016/j.physleta.2024.130063","url":null,"abstract":"<div><div>We revisit the Feynman approach to the Josephson effect, which employs a pair of linear coupling equations for its modeling. It is found that while the exact solutions can account for the AC Josephson effect when the coupling strength is significantly less than the voltage, they fail to produce the DC Josephson effect in any practical scenario. To address this fundamental discrepancy, we derive the coupled Ginzburg-Landau (GL) equations for two interconnected superconductors based on BCS theory. These equations reveal that the nonlinear coupling, which is overlooked in the Feynman approach, is crucial in describing the spontaneous symmetry breaking in superconductors, a critical factor for achieving the DC Josephson effect. When the coupled GL equations are applied to a double junction, a sawtooth current pattern emerges, a result unattainable via the Feynman approach.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130063"},"PeriodicalIF":2.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700891","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 : 2024-11-17DOI: 10.1016/j.physleta.2024.130079
Jianglong Qu , Xiaoqiu Shi , Minghui Li , Yong Cai , Xiaohong Yu , Weijie Du
The problem of dismantling multiplex complex networks, i.e., finding a minimal set of critical nodes to achieve maximum disruption, has received extensive attention because many real-world complex systems can more properly be represented as multiplex complex networks. However, most related studies mainly focus on the single-layer network dismantling, which ignores the inter-layer relationships of the real-world complex systems. Meanwhile, most of the existing network dismantling methods provide a set of critical nodes only considering a single predetermined measure such as degree centrality, betweenness centrality, or collective influence. Unfortunately, this approach is not universally valid, especially in the context of multiplex complex networks. In our study, a memetic algorithm (MA) that combines a group-based global search with an individual-based local search is proposed for identifying critical nodes in the multiplex complex networks, which may lead to a set of critical nodes considering different measures. In addition, we design an efficient crossover operator and a local search operator novelly considering the influence of node neighborhoods. We conduct extensive experiments by synthetic and real-world multiplex complex networks with different inter-layer linking properties, showing that the proposed MA method has better critical node identification capability than that of several state-of-the-art methods. We also analyze the characteristics of nodes found by our MA, indicating that the critical node set is not composed of a single predetermined metric, but a combination of nodes with multiple metrics. MA shows excellent performance in enhancing the robustness of beneficial networks and dismantling deleterious networks, especially in disassortative link networks.
由于现实世界中的许多复杂系统都可以更恰当地表示为多重复杂网络，因此多重复杂网络的拆解问题，即寻找一组最小的关键节点以实现最大破坏的问题受到了广泛关注。然而，大多数相关研究主要关注单层网络的拆解，忽略了现实世界复杂系统的层间关系。同时，现有的网络拆解方法大多只考虑单一的预定度量，如度中心性、间度中心性或集体影响力，从而提供一组关键节点。遗憾的是，这种方法并不普遍有效，尤其是在多重复杂网络中。在我们的研究中，我们提出了一种记忆算法（MA），它结合了基于群体的全局搜索和基于个体的局部搜索，用于识别多重复杂网络中的关键节点，这可能会产生一组考虑不同度量的关键节点。此外，我们还设计了一种高效的交叉算子和局部搜索算子，新颖地考虑了节点邻域的影响。我们通过具有不同层间连接特性的合成和实际多路复用网络进行了大量实验，结果表明，与几种最先进的方法相比，所提出的 MA 方法具有更好的临界节点识别能力。我们还分析了 MA 发现的节点的特征，表明关键节点集不是由单一的预定度量组成，而是由具有多种度量的节点组合而成。MA 在增强有益网络的鲁棒性和瓦解有害网络方面表现出色，尤其是在失配链接网络中。
{"title":"Identifying critical nodes in multiplex complex networks by using memetic algorithms","authors":"Jianglong Qu , Xiaoqiu Shi , Minghui Li , Yong Cai , Xiaohong Yu , Weijie Du","doi":"10.1016/j.physleta.2024.130079","DOIUrl":"10.1016/j.physleta.2024.130079","url":null,"abstract":"<div><div>The problem of dismantling multiplex complex networks, i.e., finding a minimal set of critical nodes to achieve maximum disruption, has received extensive attention because many real-world complex systems can more properly be represented as multiplex complex networks. However, most related studies mainly focus on the single-layer network dismantling, which ignores the inter-layer relationships of the real-world complex systems. Meanwhile, most of the existing network dismantling methods provide a set of critical nodes only considering a single predetermined measure such as degree centrality, betweenness centrality, or collective influence. Unfortunately, this approach is not universally valid, especially in the context of multiplex complex networks. In our study, a memetic algorithm (MA) that combines a group-based global search with an individual-based local search is proposed for identifying critical nodes in the multiplex complex networks, which may lead to a set of critical nodes considering different measures. In addition, we design an efficient crossover operator and a local search operator novelly considering the influence of node neighborhoods. We conduct extensive experiments by synthetic and real-world multiplex complex networks with different inter-layer linking properties, showing that the proposed MA method has better critical node identification capability than that of several state-of-the-art methods. We also analyze the characteristics of nodes found by our MA, indicating that the critical node set is not composed of a single predetermined metric, but a combination of nodes with multiple metrics. MA shows excellent performance in enhancing the robustness of beneficial networks and dismantling deleterious networks, especially in disassortative link networks.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130079"},"PeriodicalIF":2.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-15DOI: 10.1016/j.physleta.2024.130065
Zhi-Han Sun , Lu-Di Zhang , Hong-Jian Feng
Fine-tuning the composition of cesium-lead halide to enhance the power conversion efficiency of solar cells is a challenging task. Machine learning is used to accelerate the screening of promising photovoltaic materials from 5,376 candidate structures within seconds. The predicted results show that B-site regulation has a greater impact on the electronic structure and optoelectronic properties, primarily due to its significant contribution at the band edge. CsPb0.75Cu0.25Br3 and CsPb0.75Cu0.25I3 are quickly screened and exhibit high spectral limited maximum efficiencies of 24.51 % and 32.46 %, respectively. SHAP analysis of feature importance reveals that both atomic mass and atomic number significantly influence bandgap prediction, impacting results on both global and local sample levels. The DFT calculations prove that Cu2+ introduces s and d orbitals at the band edge, creating additional channels for carrier transport and enhancing the density of states. This work provides guidance for the experimental study on composition engineering of perovskite materials.
微调卤化铯铅的成分以提高太阳能电池的功率转换效率是一项具有挑战性的任务。机器学习用于在几秒钟内从 5376 种候选结构中加速筛选出有前景的光伏材料。预测结果表明，B 位调控对电子结构和光电特性的影响更大，这主要是由于它在带边的重要贡献。CsPb0.75Cu0.25Br3 和 CsPb0.75Cu0.25I3 很快就被筛选出来，并表现出很高的光谱限制最大效率，分别为 24.51 % 和 32.46 %。对特征重要性的 SHAP 分析表明，原子质量和原子序数都会对带隙预测产生重大影响，并对全局和局部样品水平的结果产生影响。DFT 计算证明，Cu2+ 在带边引入了 s 和 d 轨道，为载流子传输创造了额外的通道，并提高了状态密度。这项工作为包晶材料成分工程的实验研究提供了指导。
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Pub Date : 2024-11-15DOI: 10.1016/j.physleta.2024.130060
H.W.A. Riaz , J. Lin , J. Wang
In this paper, we present an extended semi-discrete matrix coupled dispersionless system, building on the framework explored in [Appl. Math. Lett. 158 (2024) 109217]. We propose a Lax pair and employ the Darboux transformation to construct explicit solutions. These solutions reveal diverse phenomena, including periodic patterns, breathers, and rogue waves. Notably, the extended system exhibits intricate interactions between bright and dark solitons and between bright solitons and rogue waves. Furthermore, we provide a numerical experiment for the reduced semi-discrete coupled dispersionless equations to demonstrate the effectiveness of the developed method.
本文以[Appl. Math. Lett. 158 (2024) 109217]中探索的框架为基础，提出了一个扩展的半离散矩阵耦合无色散系统。我们提出了一个拉克斯对，并利用达尔布克斯变换构建了显式解。这些解揭示了各种现象，包括周期模式、呼吸波和流氓波。值得注意的是，扩展系统在亮孤子和暗孤子之间以及亮孤子和流氓波之间表现出错综复杂的相互作用。此外，我们还提供了还原半离散耦合无分散方程的数值实验，以证明所开发方法的有效性。
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