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Tunable quantum transport in topological semimetal candidates LaxSr1-xMnSb2 拓扑半金属候选材料 LaxSr1-xMnSb2 中的可调谐量子输运
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-09-12 DOI: 10.1209/0295-5075/ad7286
Jiangpeng Song, Junbo Li and Zan Du
{"title":"Tunable quantum transport in topological semimetal candidates LaxSr1-xMnSb2","authors":"Jiangpeng Song, Junbo Li and Zan Du","doi":"10.1209/0295-5075/ad7286","DOIUrl":"https://doi.org/10.1209/0295-5075/ad7286","url":null,"abstract":"The magnetic semimetal SrMnSb2 contains a nonsymmorphic crystal symmetry that could protect Dirac crossings, offering the coexistence of a quasi-two-dimensional characteristic, magnetic order and nontrivial topology in bulk single crystals. Here, we report the evolution of Fermi surfaces by probing quantum oscillations in the LaxSr1-xMnSb2 single crystals. Hall measurements reveal that the conduction process changes from a hole-dominated multiband nature to a single hole-band nature after La doping. Compared with parent-SrMnSb2, the Fermi surface corresponding to Fα is slightly enlarged and the small Fermi surface corresponding to Fγ appears with a tunable feature in La-doped crystals. The topological semimetal candidates LaxSr1-xMnSb2 provide a fine-tuning platform for potential applications in the future.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"15 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Non-magnetic layers with a single symmetry-protected Dirac cone: Which additional dispersions must appear? 具有单一对称保护狄拉克锥的非磁层：必须出现哪些额外的色散？
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-09-12 DOI: 10.1209/0295-5075/ad7317
V. Damljanović
{"title":"Non-magnetic layers with a single symmetry-protected Dirac cone: Which additional dispersions must appear?","authors":"V. Damljanović","doi":"10.1209/0295-5075/ad7317","DOIUrl":"https://doi.org/10.1209/0295-5075/ad7317","url":null,"abstract":"In two-dimensional (2D), non-magnetic materials, a single Dirac cone at high-symmetry point (HSP) of the Brillouin zone (BZ), akin to the one in graphenes’ band structure, cannot appear as the only quasiparticle at the Fermi level. Here we found two layer groups with time-reversal symmetry, among all possible both without and with spin-orbit coupling, that host one Dirac cone at HSP and we show which additional dispersions appear: a pair of Dirac lines on opposite BZ edges and a pair of Dirac cones that can be moved but not removed by symmetry preserving perturbations, on the other two BZ edges. We illustrate our theory by a tight-binding band structure and discuss real 2D materials that belong to one of the two symmetry groups. Finally, we single out smaller or bigger discrepancies among the published papers on the same or related topic.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"81 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Total free-free Gaunt factors prediction using machine learning models 利用机器学习模型预测总自由度高特系数
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-09-12 DOI: 10.1209/0295-5075/ad73fe
D. E. Zenkhri, A. Benkrane and M. T. Meftah
{"title":"Total free-free Gaunt factors prediction using machine learning models","authors":"D. E. Zenkhri, A. Benkrane and M. T. Meftah","doi":"10.1209/0295-5075/ad73fe","DOIUrl":"https://doi.org/10.1209/0295-5075/ad73fe","url":null,"abstract":"Gaunt factors are fundamental in describing the interaction of free electrons with photons, playing a crucial role in astrophysical processes such as radiation transport and emission spectra. Traditional methods for computing Gaunt factors involve complex integrations and intricate mathematical formulations, often being computationally expensive and time-consuming. This study explores an alternative approach using machine learning models to predict free-free Gaunt factors. Three models were employed: Artificial Neural Network (ANN), Support Vector Regression (SVR), and Gradient Boosting Regression (GBR). The obtained results demonstrate high performance, with R2 scores ranging from 0.98 to 0.99, indicating the potential of machine learning models to accurately predict Gaunt factors.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"52 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
“Causometry” of processes in arbitrary dynamical systems: Three levels of directional coupling quantifiers 任意动态系统中过程的 "因果关系"：三层定向耦合量化器
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-09-04 DOI: 10.1209/0295-5075/ad7285
Dmitry A. Smirnov
{"title":"“Causometry” of processes in arbitrary dynamical systems: Three levels of directional coupling quantifiers","authors":"Dmitry A. Smirnov","doi":"10.1209/0295-5075/ad7285","DOIUrl":"https://doi.org/10.1209/0295-5075/ad7285","url":null,"abstract":"The concept of dynamical causal effect (DCE) which unites numerous causality quantifiers for processes in dynamical systems (DS) as measures of X-responses to some Y-variations is generalised through updating the definition of the factors constituting those variations. Along with initial states and governing parameters, external driving (noise) realisations are included and all three factors are represented with their probability distributions. Three basic levels of DCEs are introduced based on their resolution with respect to each factor: low (three factors resolved), medium (two factors), and high (one factor). It is shown that i) a directional coupling with zero transfer entropy (a medium-level DCE) may be strong in terms of its low-level DCEs; ii) DCEs of the same level may be small or large depending on their Y-variations, e.g., a coupling which induces synronisation is both weak and strong according to different medium-level DCEs; iii) high-level DCEs allow comparison of couplings from different sources which may be inaccessible via medium-level DCEs. The generalised DCE concept applies to arbitrary DS including deterministic (driven) DS and random DS with any kind of noise.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"6 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prospects for the use of plasmonic vortices to control nanosystems 利用等离子漩涡控制纳米系统的前景
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-09-04 DOI: 10.1209/0295-5075/ad7287
G. F. Quinteiro Rosen and P. I. Tamborenea
{"title":"Prospects for the use of plasmonic vortices to control nanosystems","authors":"G. F. Quinteiro Rosen and P. I. Tamborenea","doi":"10.1209/0295-5075/ad7287","DOIUrl":"https://doi.org/10.1209/0295-5075/ad7287","url":null,"abstract":"Fueled by the rapid pace of technological advancements, the convergence of ideas from optics and solid-state physics is yielding valuable insights into the fundamental principles governing interactions between light and matter at the nanoscale, as well as paving the way for future technologies. In this review, we explore a burgeoning avenue that investigates the synergy between plasmonics and optical vortex concepts. The excitation of plasmon modes with phase dislocations, occasionally referred to as plasmonic vortices, has revealed novel facets of physics. One particularly promising expansion of this field pertains to the manipulation of nearby nanostructures. Consequently, we provide commentary on the associated research, which offers innovative solutions to a variety of technological challenges.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"86 1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spontaneous emergence of temporal structures in a continuously driven many-body system 连续驱动多体系统中时间结构的自发出现
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-09-03 DOI: 10.1209/0295-5075/ad6e16
Tingmei Li, Hong-Xia Li, Yu-Hui Chen and Xiangdong Zhang
{"title":"Spontaneous emergence of temporal structures in a continuously driven many-body system","authors":"Tingmei Li, Hong-Xia Li, Yu-Hui Chen and Xiangdong Zhang","doi":"10.1209/0295-5075/ad6e16","DOIUrl":"https://doi.org/10.1209/0295-5075/ad6e16","url":null,"abstract":"The spontaneous emergence of temporal structures challenges the conventional understanding that systems governed by time-invariant laws remain unchanged over time. Recent experiments have observed this time translation symmetry breaking in quantum atomic systems that either exhibit strong atom-atom interactions or have low dissipation rates. While current theoretical frameworks reveal the importance of strong atom-atom interactions, they fall short in explaining this phenomenon observed in low-dissipation atomic systems. Here, we present a theoretical study on the spontaneous breaking of time translation symmetry in materials with low dissipation rates. By constructing phase diagrams for a system of four-level atoms driven by a continuous-wave optical field, we identify the essential requirements for self-sustained temporal motions. These include a driven open system, nonlinear interactions, and sufficient degrees of freedom that facilitate competing processes. Our findings contribute to a better understanding of the emergence of spontaneous time translation symmetry breaking in these materials.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"55 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Heterostructure channel designs for the topological interface state of surface water waves using topology optimization 利用拓扑优化技术实现表面水波拓扑界面状态的异质结构通道设计
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-28 DOI: 10.1209/0295-5075/ad6f3e
Ting Liu, Hongwei Liu and Jingwei Yin
{"title":"Heterostructure channel designs for the topological interface state of surface water waves using topology optimization","authors":"Ting Liu, Hongwei Liu and Jingwei Yin","doi":"10.1209/0295-5075/ad6f3e","DOIUrl":"https://doi.org/10.1209/0295-5075/ad6f3e","url":null,"abstract":"The increase of the concentrated density of wave energy is conducive to improving the generation efficiency of wave power generation. Interface states induced in the heterostructure channels can be applied to concentrate the surface water wave. The optimal designs of heterostructure channels can be found through the topology optimization based on the multiple population genetic algorithm to induce a topological interface state with high transmission at the desired frequency. The introduction of the topological interface state effectively and steadily increases the wave energy density in a certain space and improves the robustness and the localization of the water wave concentrator. This topology optimization method provides a design scheme for the wave energy concentrator in the field of ocean engineering.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"3 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Solving the spectral problem via the boundary approximation in theory 通过边界近似理论解决光谱问题
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-28 DOI: 10.1209/0295-5075/ad6eb5
Lingxiao Long and Yunguo Jiang
{"title":"Solving the spectral problem via the boundary approximation in theory","authors":"Lingxiao Long and Yunguo Jiang","doi":"10.1209/0295-5075/ad6eb5","DOIUrl":"https://doi.org/10.1209/0295-5075/ad6eb5","url":null,"abstract":"In theory, the resonance scattering structure is triggered by the so-called delocalized modes trapped between the pair. The frequencies and configurations of such modes depend on the half-separation a, which can be derived from the Schrödinger-like equation. We propose to use the boundary conditions to connect the half-localized and delocalized modes, and use boundary approximation (BA) to solve the spectrum analytically. In detail, we derive the explicit form of frequencies, configurations and spectral wall locations of the delocalized modes. We test the analytical prediction with the numerical simulation of the Schrödinger-like equation, and obtain astonishing agreement between them at the long separation regime.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"21 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multifold topological semimetals 多元拓扑半金属
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-27 DOI: 10.1209/0295-5075/ad6bbc
Iñigo Robredo, Niels B. M. Schröter, Claudia Felser, Jennifer Cano, Barry Bradlyn and Maia G. Vergniory
{"title":"Multifold topological semimetals","authors":"Iñigo Robredo, Niels B. M. Schröter, Claudia Felser, Jennifer Cano, Barry Bradlyn and Maia G. Vergniory","doi":"10.1209/0295-5075/ad6bbc","DOIUrl":"https://doi.org/10.1209/0295-5075/ad6bbc","url":null,"abstract":"The discovery of topological semimetals with multifold band crossings has opened up a new and exciting frontier in the field of topological physics. These materials exhibit large Chern numbers, leading to long double Fermi arcs on their surfaces, which are protected by either crystal symmetries or topological order. The impact of these multifold crossings extends beyond surface science, as they are not constrained by the Poincar classification of quasiparticles and only need to respect the crystal symmetry of one of the 1651 magnetic space groups. Consequently, we observe the emergence of free fermionic excitations in solid-state systems that have no high-energy counterparts, protected by non-symmorphic symmetries. In this work, we review the recent theoretical and experimental progress made in the field of multifold topological semimetals. We begin with the theoretical prediction of the so-called multifold fermions and discuss the subsequent discoveries of chiral and magnetic topological semimetals. Several experiments that have realized chiral semimetals in spectroscopic measurements are described, and we discuss the future prospects of this field. These exciting developments have the potential to deepen our understanding of the fundamental properties of quantum matter and inspire new technological applications in the future.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"48 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Novel small-size seismic metamaterial with ultra-low frequency bandgap for Lamb waves 具有超低频带隙的新型小尺寸地震超材料，适用于 Lamb 波
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-08-26 DOI: 10.1209/0295-5075/ad6bba
Nannan Shi, Han Liu and Liutao Zhao
{"title":"Novel small-size seismic metamaterial with ultra-low frequency bandgap for Lamb waves","authors":"Nannan Shi, Han Liu and Liutao Zhao","doi":"10.1209/0295-5075/ad6bba","DOIUrl":"https://doi.org/10.1209/0295-5075/ad6bba","url":null,"abstract":"Seismic metamaterials (SMs) possess bandgap characteristics, enabling effective attenuation of seismic waves within a specific frequency range. However, small-sized SMs typically struggle to achieve a wide low-frequency bandgap. This paper proposes four types of SMs. The dispersion curves of these models were analyzed, and their vibration modes were studied to elucidate the bandgap mechanism. To investigate the influence of structural parameters on the bandgap, geometric variables are analyzed. Subsequently, the spectrum and acceleration time history curves of Lamb waves in a finite SM system are analyzed to verify the bandgap's authenticity. The designed structure exhibits a bandgap ranging from 1.24 Hz to 16.86 Hz, with a relative bandwidth as high as 172.6% and over 96% maximum vibration displacement attenuation of the El Centro seismic wave. The designed SMs effectively cover the 2 Hz seismic peak spectrum that leads to structural damage. They possess ideal relative bandwidth and excellent isolation performance, further advancing the engineering application of SMs.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"55 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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