The European Physical Journal D最新文献_第10页

Scattering of electron and positron by atomic nitrogen and its application in transport characteristics 氮原子对电子和正电子的散射及其在输运特性中的应用

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2026-05-30 DOI: 10.1140/epjd/s10053-026-01166-3

G. B. Ragimkhanov, M. Shorifuddoza, Z. R. Khalikova, Mehrdad Shahmohammadi Beni, M. M. Haque, Hiroshi Watabe, M. Atiqur R. Patoary, A. K. F. Haque, M. Alfaz Uddin

{"title":"Scattering of electron and positron by atomic nitrogen and its application in transport characteristics","authors":"G. B. Ragimkhanov, M. Shorifuddoza, Z. R. Khalikova, Mehrdad Shahmohammadi Beni, M. M. Haque, Hiroshi Watabe, M. Atiqur R. Patoary, A. K. F. Haque, M. Alfaz Uddin","doi":"10.1140/epjd/s10053-026-01166-3","DOIUrl":"10.1140/epjd/s10053-026-01166-3","url":null,"abstract":"<p>A theoretical investigation of electron and positron scattering from atomic nitrogen over the incident energy range from 1 eV to 1 MeV is presented. Scattering observables, including integrated elastic, momentum transfer, inelastic, ionization, and total cross sections, as well as the Sherman function, are calculated by solving the Dirac relativistic partial-wave equation with a local complex optical potential. Critical minima in the elastic differential cross section and corresponding maxima in the predicted spin polarization are examined in detail. The calculated cross section set is subsequently employed in a Monte Carlo simulation to determine electron transport properties in nitrogen gas for reduced electric fields (E/N) from 1 to 500 Td. Results for the drift velocity, mean energy, and longitudinal diffusion and mobility coefficients are presented and discussed.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjd/s10053-026-01166-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148173291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Generation of elliptically polarized high-order harmonics using few-cycle pulses with one or two carrier frequencies 利用具有一个或两个载波频率的少周期脉冲产生椭圆极化高次谐波

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2026-05-30 DOI: 10.1140/epjd/s10053-026-01185-0

D. Habibović, D. B. Milošević

{"title":"Generation of elliptically polarized high-order harmonics using few-cycle pulses with one or two carrier frequencies","authors":"D. Habibović, D. B. Milošević","doi":"10.1140/epjd/s10053-026-01185-0","DOIUrl":"10.1140/epjd/s10053-026-01185-0","url":null,"abstract":"<p>Using the strong-field approximation, we study the generation of elliptically polarized high-order harmonics driven by few-cycle laser pulses with one or two carrier frequencies. In the few-cycle regime, sub-cycle electron dynamics strongly modifies the harmonic spectra and their polarization, leading to pronounced dependence on the pulse duration, carrier-envelope phase (CEP), and driving-field polarization. For monochromatic pulses, elliptically polarized harmonics are produced by elliptically polarized field. High-harmonic yield for elliptically polarized laser field rapidly decreases for atomic targets. For molecular targets harmonic ellipticity can be substantial even for linearly polarized driving pulses. Notably, the harmonic ellipticity displays abrupt changes for molecular orientations associated with destructive interference minima, providing robust, CEP-insensitive structural signatures. For bichromatic pulses, we demonstrate enhanced control of spectral and polarization properties: linearly polarized <span>(omega )</span>–<span>(2omega )</span> field generates highly CEP-dependent multi-plateau spectra, whereas counterrotating elliptically polarized fields yield harmonics with significant ellipticity and moderate intensity. Our results establish few-cycle and two-carrier-frequency driving schemes as versatile tools for polarization control and polarization-resolved high-harmonic spectroscopy.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148173288","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

Fathom the transition in a learning algorithm through irradiation-tuned pore condensation 通过辐射调节孔隙凝结的学习算法来理解过渡

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2026-05-26 DOI: 10.1140/epjd/s10053-026-01157-4

Christian Kexel

{"title":"Fathom the transition in a learning algorithm through irradiation-tuned pore condensation","authors":"Christian Kexel","doi":"10.1140/epjd/s10053-026-01157-4","DOIUrl":"10.1140/epjd/s10053-026-01157-4","url":null,"abstract":"<p>Phase transitions represent fundamentally interdisciplinary phenomena occurring across a wide range of sizes and time horizons beginning at the subatomic scale. They also appear in formal mathematical problems including optimisation, inference or learning tasks. In any case, critical points are significant for marking where a system’s behaviour decisively alters. Conveniently, the characteristics of state changes allow revealing shared collective mechanisms from seemingly unrelated microscopic details. Very recently, for a popular learning ansatz a novel transformation-like effect has been discovered. In general, its information processing aims to iteratively split provided numerical inputs. In particular, the structural growth of the resulting partitions shows striking parallels with molecular adsorption in confined geometries and the accompanying vapour–liquid conversion. Accordingly, statistical mechanics and chemical modelling are employed in this paper to provide an initial high-level understanding from a comparative perspective. Specifically: (i) previous complex empirical findings are reduced to a minimal viable example comprising a simplified algorithm and an expressive one-dimensional dataset; (ii) essential computational parameters are systematically probed; (iii) those parameters are heuristically mapped onto thermodynamic quantities to explore analogies of learning with condensation in porous media; and (iv) kinetic Monte Carlo simulations are performed to flexibly illustrate microscopic chemical details. The study outcomes indicate that the two key attributes facilitating the structural rearrangement during learning have an intuitive role: they correspond to pore diameter as well as the fluid–fluid interparticle cohesion. Experimentally both could be modulated by focused irradiation.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjd/s10053-026-01157-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Entanglement measures for multipartite quantum systems: limitations and new approaches 多部量子系统的纠缠测量：限制和新方法

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2026-05-26 DOI: 10.1140/epjd/s10053-026-01182-3

Reza Hamzehofi

{"title":"Entanglement measures for multipartite quantum systems: limitations and new approaches","authors":"Reza Hamzehofi","doi":"10.1140/epjd/s10053-026-01182-3","DOIUrl":"10.1140/epjd/s10053-026-01182-3","url":null,"abstract":"<div><p>In this research, we investigate the distribution of entanglement within two entangled <i>n</i>-qubit systems using the one-tangle and <i>π</i>-tangle. Our analysis reveals that for certain quantum states such as the generalized <i>W</i> state, where the probability coefficients depend on the number of qubits, increasing the system size causes these traditional measures to gradually diminish, with the monogamy relation tending toward equality. This behavior highlights a limitation of conventional tangle-based measures in capturing multipartite correlations in large systems. To overcome this, we introduce two alternative measures: the sum of squared one-tangles and the generalized residual entanglement. Unlike the standard one-tangle and <i>π</i>-tangle, these new quantities remain robust as the number of qubits increases. Moreover, we propose a strong monogamy relation that preserves nontrivial entanglement distribution even in the large-<i>n</i> limit. Our results provide a refined framework for quantifying entanglement in high-dimensional multipartite systems.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172651","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

Theoretical research on a vanadium dioxide-based terahertz metamaterial supporting switchable dual functions of broadband absorption and polarization conversion 一种支持宽带吸收和偏振转换双重功能可切换的二氧化钒基太赫兹超材料的理论研究

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2026-05-25 DOI: 10.1140/epjd/s10053-026-01177-0

Ming Ji, Hongze Li, Danqi Li, Qi Liang, Jinping Tian, Rongcao Yang

{"title":"Theoretical research on a vanadium dioxide-based terahertz metamaterial supporting switchable dual functions of broadband absorption and polarization conversion","authors":"Ming Ji, Hongze Li, Danqi Li, Qi Liang, Jinping Tian, Rongcao Yang","doi":"10.1140/epjd/s10053-026-01177-0","DOIUrl":"10.1140/epjd/s10053-026-01177-0","url":null,"abstract":"<div><p>A switchable dual-functional terahertz (THz) metamaterial that can switch between broadband absorption and cross-polarization conversion is designed and investigated based on the phase transition characteristics of vanadium dioxide (<span>({text{VO}}_{{2}})</span>). When <span>({text{VO}}_{{2}})</span> is in its metallic state, the metamaterial functions as a broadband absorber, exhibiting an absorption rate exceeding 90% and a relative bandwidth (RBW) of 90% within the range of 2.16–5.71 THz. When <span>({text{VO}}_{{2}})</span> is in its insulating state, the device operates as a broadband polarization converter, achieving a polarization conversion ratio (PCR) exceeding 90% and a relative bandwidth (RBW) of 131% within the range of 1.25–6.02 THz. In addition, for these two working modes, the device exhibits acceptable tolerance toward incident angle and polarization angle. These advantages make the proposed <span>({text{V}text{O}}_{2})</span>-based dual-functional metamaterial device have potential application prospects in multiple THz fields such as absorption, polarization conversion, imaging, and so on.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148010071","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

Theoretical study on the structure and properties of CoIn4Ba crystals CoIn4Ba晶体结构与性能的理论研究

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2026-05-21 DOI: 10.1140/epjd/s10053-026-01171-6

Xiaodong Zhu, Xin Liu, Hongshan Chen

{"title":"Theoretical study on the structure and properties of CoIn4Ba crystals","authors":"Xiaodong Zhu, Xin Liu, Hongshan Chen","doi":"10.1140/epjd/s10053-026-01171-6","DOIUrl":"10.1140/epjd/s10053-026-01171-6","url":null,"abstract":"<div><p>Due to the hypoelectronic nature, the building units of the IIIA group metalloid compounds are highly charged and they usually connect into complicated network structures. This makes the theoretical prediction of their crystal structures difficult. This paper studies the low-energy structures and their bonding natures of the CoIn<sub>4</sub>Ba crystal by using evolutionary algorithm combined with spin-polarized density functional theory. The results show that the lowest energy polymorph-<i>α</i> is built by Co<sub>2</sub>In<sub>4</sub> octahedral chains connected by Ba atoms. The polymorph-<i>β</i> is formed by the Co@In<sub>6</sub> octahedrons with four shared In atoms. The formation enthalpies of the two polymorphs are − 4.05 and − 3.94 eV, and the phonon dispersion spectra demonstrated that both structures are dynamically stable. These two polymorphs are metalloids with zero bandgaps. The most stable structure is magnetic with a magnetic moment 0.93 μ<sub>B</sub> per CoIn<sub>4</sub>Ba unit. This special chain structure with magnetic moment may have applications in the spintronics.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div><div><p>Geometric structures and density of states of the two polymorphs</p></div></div></figure></div></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009397","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

The two-photon detachment of the positronium negative ion 正电子负离子的双光子分离

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2026-05-20 DOI: 10.1140/epjd/s10053-026-01156-5

William Mitchell, Sandra J. Ward

引用次数: 0

A simple technique to construct high symmetry polyhedra and polytopes based on the Hückel method 基于h<s:1> ckel法构造高对称多面体和多面体的简单方法

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2026-05-19 DOI: 10.1140/epjd/s10053-026-01178-z

Savino Longo

引用次数: 0

Statistics and systematics of electron EDM searches with BaF 利用BaF进行电子EDM搜索的统计与系统

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2026-05-19 DOI: 10.1140/epjd/s10053-026-01175-2

A. Boeschoten, V. R. Marshall, T. B. Meijknecht, A. P. Touwen, P. Aggarwal, N. Balasubramanian, R. Bause, H. L. Bethlem, A. Borschevsky, T. H. Fikkers, P. A. B. Haase, Y. Hao, S. Hoekstra, J. W. F. van Hofslot, S. A. Jones, K. Jungmann, J. E. J. Levenga, M. C. Mooij, H. Mulder, B. A. Nijman, E. H. Prinsen, B. J. Schellenberg, I. E. Thompson, R. G. E. Timmermans, L. van Sloten, W. Ubachs, J. de Vries, L. Willmann, Y. Yin

{"title":"Statistics and systematics of electron EDM searches with BaF","authors":"A. Boeschoten, V. R. Marshall, T. B. Meijknecht, A. P. Touwen, P. Aggarwal, N. Balasubramanian, R. Bause, H. L. Bethlem, A. Borschevsky, T. H. Fikkers, P. A. B. Haase, Y. Hao, S. Hoekstra, J. W. F. van Hofslot, S. A. Jones, K. Jungmann, J. E. J. Levenga, M. C. Mooij, H. Mulder, B. A. Nijman, E. H. Prinsen, B. J. Schellenberg, I. E. Thompson, R. G. E. Timmermans, L. van Sloten, W. Ubachs, J. de Vries, L. Willmann, Y. Yin","doi":"10.1140/epjd/s10053-026-01175-2","DOIUrl":"10.1140/epjd/s10053-026-01175-2","url":null,"abstract":"<p>The NL-<i>e</i>EDM experiment searches for a nonzero electric dipole moment of the electron <span>(d_e)</span> (<i>e</i>EDM) in the ground state of barium monofluoride (BaF). A beam of BaF from a supersonic expansion source is probed with the spin-precession method presented in Boeschoten et al. (Phys Rev A 110:L010801, 2024). This method permits the extraction of an <i>e</i>EDM value as well as values for parameters causing a possible systematic bias leading to a false <i>e</i>EDM. The currently achievable sensitivity is limited by statistics collected in a period of 34 h and yields an <span>(d_e)</span> of <span>(2(3) times 10^{-25})</span> <span>(e,)</span>cm. Furthermore, from the same dataset sufficiently strong limits on parameters which can induce a false <i>e</i>EDM are extracted. These are mainly the electric field <b>E</b> and the intensity of the lasers fields in the fiducial volume of the experiment. We summarize the steps required to upgrade of the experiment to reach a competitive level on <span>(d_e)</span>, e.g., an intense laser-cooled beam from a cryogenic buffer gas source and the light collection efficiency of fluorescence.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjd/s10053-026-01175-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Symmetry breaking in TDLDA dynamics of symmetric molecules 对称分子TDLDA动力学中的对称性破缺

IF 1.5 4区物理与天体物理

The European Physical Journal D Pub Date : 2026-05-18 DOI: 10.1140/epjd/s10053-026-01141-y

P. M. Dinh, P.-G. Reinhard, D. Dundas, D. Hughes, E. Suraud

{"title":"Symmetry breaking in TDLDA dynamics of symmetric molecules","authors":"P. M. Dinh, P.-G. Reinhard, D. Dundas, D. Hughes, E. Suraud","doi":"10.1140/epjd/s10053-026-01141-y","DOIUrl":"10.1140/epjd/s10053-026-01141-y","url":null,"abstract":"<p>In a recent series a papers, we have identified an unstable behavior in the electronic response of small molecules to some ultrafast XUV pulses. Calculations have been done using real-time Time-Dependent Density Functional Theory in the Local Density Approximation version complemented by a self-interaction correction. The aim of the present paper is to clarify the mechanism of dipole instability by associating it with a symmetry breaking. The line of arguments develops along two steps. We first discuss the spectral properties of the instability in dynamical scenarios, focusing on the simplified case of direct hole creation at initial time. We discuss in particular the potential relation of the instability to the plasmon. We show that, in some specific cases, the plasmon frequency characterizes the dipole instability. Still, in most cases, an oscillation between 2 single-particle levels pops up. As a second step, we analyze the energy surfaces associated with such single-particle transitions and see that these surfaces do indeed display a maximum in the case of direct drilling of a hole state. This characterizes a typical symmetry breaking in mean-field models.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"80 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjd/s10053-026-01141-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0