The European Physical Journal B最新文献

{"title":"Geometrical distribution of agents based on a generalised Potts model","authors":"Alejandro Rivero,&nbsp;Alfonso Tarancón,&nbsp;Carlos Tarancón","doi":"10.1140/epjb/s10051-025-01005-1","DOIUrl":"10.1140/epjb/s10051-025-01005-1","url":null,"abstract":"<p>In collective local interaction systems with agents assigned to different profiles (categories, traits), the distribution of such profiles in the neighbourhood of any agent affects the exchange of ideas, a basic element in Collective Intelligence experiments. It is important to control this distribution experimentally, asking for criteria that should range from maximum homogeneity to maximum difference. We suggest a method where we obtain these criteria by adding an extra interaction term to the Q-state Potts model, producing a rich vacuum structure. By controlling the two parameters of the model, we can obtain different patterns for the geometrical distribution of the agents. We study the transitions and phase diagram of this model, considering the physics at constant magnetization, and show that the states correspond to a large diversity of mixing patterns, directly applicable to agent distribution in CI experiments.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-01005-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145005572","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}

{"title":"Effect of bee-pollen extract on the green synthesis of CuO nanoparticles","authors":"F. Djeghloul,&nbsp;Y. Messai,&nbsp;Y. Medkour,&nbsp;A. Zahir,&nbsp;A. Djabou,&nbsp;N. Bouarissa,&nbsp;A. Manseri,&nbsp;A. Zouaoui","doi":"10.1140/epjb/s10051-025-01026-w","DOIUrl":"10.1140/epjb/s10051-025-01026-w","url":null,"abstract":"<div><p>The environmentally friendly synthesis of cupric oxide nanoparticles using biological approaches has shown great promise as an alternative to expensive and user-unfriendly conventional methods. In this study, bee pollen extract was used for the first time as a simple and economical method for the biosynthesis of CuO nanoparticles at room temperature without the adding of harmful chemical solvents. The effect of the amount of BP on the structural, optical, and morphological properties of CuO nanoparticles was examined using different analytical methods. According to the XRD results, CuO nanoparticles prepared with the lowest amount of BP exhibited the smallest average size (19.57 nm), maximum dislocation and micro strain density, and a high degree of crystallinity. FTIR results confirmed that the Cu–O bond was formed by the possible functional groups of the biomolecules present in the bee pollen extract. UV and visible emission peaks were observed in the PL spectra, demonstrating the good optical properties of the BP products. It was found that the optical energy band gap decreased from 1.485 eV to 1.408 eV as the amount of BP increased. Moreover, the amount of BP significantly influenced the morphological properties of the CuO nanoparticles. At low amounts, spherical and pseudo-spherical shapes of CuO nanoparticles were observed, while at higher amounts, strong aggregation/agglomeration of these nanoparticles was observed. The purity of the as-synthesized CuO nanoparticles was assessed by EDX characterization.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990427","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}

{"title":"Nanostructure science and vortex physics of YBa2Cu3O7 for practical high-performance coated conductor","authors":"Tomoya Horide,&nbsp;Yutaka Yoshida","doi":"10.1140/epjb/s10051-025-01025-x","DOIUrl":"10.1140/epjb/s10051-025-01025-x","url":null,"abstract":"<div><p>YBa₂Cu₃O₇ coated conductors are under active development for high-field magnet, nuclear magnetic resonance, and fusion energy applications. Extensive research efforts have focused on enhancing the performance of these conductors. Among these, significant attention has been given to vortex physics, nanoscale science, and process optimization. Grain boundaries, which act as weak link, degrade the critical current density. To mitigate this, YBa₂Cu₃O₇ films are deposited on textured metal substrates with highly oriented buffer layers. To further enhance the critical current density, nanoscale pinning centers are incorporated via self-organization during film growth. The critical current density is governed by multiscale factors involving the nanorod structure at atomic, nanoscale, and micrometer levels. Nanorod morphology and density are controlled, and additional types of pinning centers are introduced to prepare hybrid pinning centers. These nanorods alter the chemical bonding and electronic structure of YBa₂Cu₃O₇ at their interfaces. The influence of nanocomposite formation on the superconducting transition temperature is discussed based on oxygen vacancies formation induced by tensile strain. Atomic scale nature of nanostructure and macroscopic homogeneity of properties related to the process variation should be investigated to advance the coated conductor technology. The integration of advanced characterization techniques, computational simulations, and artificial intelligence technology is effective in achieving a deeper understanding and more precise control of the underlying vortex pinning and the macroscopic phenomena caused by process variation.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144998577","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}

{"title":"DNA unzipping transition","authors":"Somendra M. Bhattacharjee","doi":"10.1140/epjb/s10051-025-01028-8","DOIUrl":"10.1140/epjb/s10051-025-01028-8","url":null,"abstract":"<p>This review focuses on the force-induced unzipping transition of double-stranded DNA. It begins with a brief history of DNA melting, which emerged alongside the growth of the field of molecular biology, juxtaposed with the advancements in physics during the same post-World War II period. The earlier theories of melting of DNA were based on the Ising model and its modifications, but gradually moved toward polymer-based models. The idea of force-induced unzipping was first introduced in 1999 as a cooperative mechanism for breaking base pairs without the need for temperature changes. The paper discusses several subsequent developments addressing different aspects of the unzipping transition.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144929413","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}

{"title":"Temperature dependence of phase-ordering kinetics of the long-range Ising model with power-law decaying interactions","authors":"Ian Filippo Schönherr,&nbsp;Fabio Müller,&nbsp;Wolfhard Janke","doi":"10.1140/epjb/s10051-025-01019-9","DOIUrl":"10.1140/epjb/s10051-025-01019-9","url":null,"abstract":"<p>We study coarsening in the nonconserved Ising model in <span>(d=2)</span> dimensions with long-range interactions decaying as <span>(sim r^{-(d+sigma )})</span>, employing Metropolis Monte Carlo computer simulations based on our recently conceived very efficient predecision scheme. By comparing numerical results between different quench temperatures we confirm the temperature independence of growth laws and show that a sensible choice of temperature may yield longer observation periods in coarsening studies.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-01019-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914666","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}

{"title":"Tunable routing properties of single photon interacting with two quantum dots in a quantum router with the工-type coupled cavity waveguide system","authors":"Myong-Chol Ko,&nbsp;Sung-Jin Kim,&nbsp;Nam-Chol Kim,&nbsp;Su-Ryon Ri,&nbsp;Ju-Song Ryom,&nbsp;Kang-Sa Yun,&nbsp;Chung-Song Jo","doi":"10.1140/epjb/s10051-025-01017-x","DOIUrl":"10.1140/epjb/s10051-025-01017-x","url":null,"abstract":"<div><p>A theoretical model of 工-shaped coupled-cavity waveguide with two quantum dots is proposed to realize the single photon router, where the two quantum dots are embedded in two nodes of two infinite coupled-cavity and a finite coupled-cavity waveguide respectively. Based on the discrete scattering equations, the routing properties such as transmission, reflection, and the transfer rate of the incident single photons are theoretically investigated. It is found that they can be controlled by various parameters such as the coupling strength between two quantum dots and three coupled-cavity waveguides, the transition energies of two quantum dots, wave vector, and the energy of the incident single photons, etc. Especially, when <span>(omega_{e}^{(1)} = omega_{e}^{(2)} = 10)</span>, in case of <span>(k = 2n{pi mathord{left/ {vphantom {pi 4}} right. kern-0pt} 4},(n = 1,2,...))</span>,the incident single photons have two symmetric peaks with relative to the resonant energy, but in case of <span>(k = (2n + 1){pi mathord{left/ {vphantom {pi 4}} right. kern-0pt} 4},(n = 0,1,2,...))</span>, there appears only one transfer peak with blue or red shift due to the quantum interference between the two quantum dots. The tunable routing properties of the single photons in the 工-shape quantum router might have potential applications for future quantum devices.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909727","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}

{"title":"Comparative Monte Carlo analysis of magnetic hysteresis in C60 and dimeric (C60)2 fullerene systems","authors":"Z. Fadil,&nbsp;Chaitany Jayprakash Raorane,&nbsp;R. El Fdil,&nbsp;A. Jabar,&nbsp;Khaled H. Mahmoud,&nbsp;Abdulrahman A. Alsayyari,&nbsp;Seong Cheol Kim","doi":"10.1140/epjb/s10051-025-01029-7","DOIUrl":"10.1140/epjb/s10051-025-01029-7","url":null,"abstract":"<div><p>This study investigates the magnetic hysteresis properties of the C₆₀ and (C₆₀)₂ fullerene nanostructures according to the Blume–Emery–Griffiths model and Monte Carlo simulations. It seeks to know the influence of parameters such as exchange couplings, crystal field, and temperature on the magnetism of such materials. It was found that C₆₀ exhibited greater coercive and saturation fields than (C₆₀)₂ due to intra-cluster couplings and greater anisotropy. These results provide better understanding of the role of thermal fluctuations and structural stresses in magnetization reversal, which is crucial for magnetic nanomaterials development. These can be employed in spintronic devices, magnetic sensors, memory devices, nanoelectronics, and quantum computing.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905228","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}

{"title":"Raman spectroscopic study on solute–solvent interactions in saturated 2,2’-bipyridine and benzene solution","authors":"Hongying Mei,&nbsp;Shibo Du,&nbsp;Shuxiang Sun,&nbsp;Xinyan Zheng,&nbsp;Huali Hao,&nbsp;Juan Xiong,&nbsp;Hua Wen","doi":"10.1140/epjb/s10051-025-01027-9","DOIUrl":"10.1140/epjb/s10051-025-01027-9","url":null,"abstract":"<p>Raman scattering measurements are performed on the pure benzene (B), 2,2’-bipyridine (BD), and the saturated BD-B solution at 295 and 80 K to investigate the solute–solvent interaction on the vibrational properties. The spectrum of the BD-B shows almost a simply addition of the individual spectra of BD and B, suggesting no strong interaction among BD and B molecules. At low temperature, the solution crystallizes and its spectrum shows obvious changes including the inter- and intramolecular modes, especially the modes associated with the lattice vibrations, C–H in-plane bending, C–C interring stretching, and high-frequency C–H stretching. Our work contributes to understand the interaction between organic solute and solvent.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144897054","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}

{"title":"A comparative review of recent results on supercritical anomalies in two-dimensional kinetic Ising and Blume–Capel ferromagnets","authors":"Gloria M. Buendía,&nbsp;Celeste Mendes,&nbsp;Per Arne Rikvold","doi":"10.1140/epjb/s10051-025-01018-w","DOIUrl":"10.1140/epjb/s10051-025-01018-w","url":null,"abstract":"<p>Following the unexpected experimental discovery of “sideband” peaks in the fluctuation spectrum of thin Co films driven by a slowly oscillating magnetic field with a constant bias (Riego et al. in Phys Rev Lett 118:117202, 2017), numerical studies of two-state Ising and three-state Blume–Capel (BC) ferromagnets in this dynamically supercritical regime have flourished and been successful in explaining this phenomenon. Here, we give a comparative review of this new literature and its connections to earlier work. Following an introduction and a presentation of the two models and the computational method used in many of these studies, we present numerical results for both models. Particular attention is paid to the fact that zero spins in the BC model tend to collect at the interfaces between regions of the two nonzero spin values, ± 1. We present strong arguments that this phenomenon leads to a reduction of the effective interface tension in the BC model, compared to the Ising model.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-01018-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144892445","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}

{"title":"Insight into the optoelectronic and thermochemical properties of LiXY2 (X = Ga, Ti; Y = S, Se, Te): a DFT study","authors":"Saloni Saloni,&nbsp;Prabhat Ranjan,&nbsp;Tanmoy Chakraborty","doi":"10.1140/epjb/s10051-025-01022-0","DOIUrl":"10.1140/epjb/s10051-025-01022-0","url":null,"abstract":"<div><p>Structure, optoelectronic, and thermochemical characteristics of Li-based chalcopyrite materials LiXY₂ (X = Ga, Ti; Y = S, Se, Te) are studied using DFT approach. Geometry optimization and modeling of LiXY₂ are performed using several functionals like B3LYP/LANL2DZ, B3LYP/SDD, B3LYP/DEF2TZVP, CAM-B3LYP/LANL2DZ, CAM-B3LYP/SDD, CAM-B3LYP/DEF2TZVP, APFD/LANL2DZ, APFD/SDD, and APFD/DEF2TZVP within DFT framework and made a comparative analysis. It is found that functional B3LYP/DEF2TZVP provides the most suitable result. Using B3LYP/DEF2TZVP, the HOMO–LUMO gaps of LiGaS₂, LiGaSe₂ and LiGaTe₂ are determined as 3.34, 3.08, and 2.72 eV, respectively, whereas for LiTiS₂, LiTiSe₂, and LiTiTe₂, it is found as 2.71, 2.77, and 1.79 eV correspondingly, signifying their possible uses in optoelectronic devices and solar cells. It also specifies that the replacement of Ga with Ti in the host materials helps in the reduction of the energy gap, which exhibits its better absorption ability. The vertical ionization potential (VIP) as well as vertical electron affinity (VEA) of LiTiY₂ are found lesser in magnitude in comparison with LiGaY₂. LiTiTe₂ exhibits the lowest VIP, whereas LiGaTe₂ displays the maximum VEA, which indicates that LiTiTe₂ and LiGaTe₂ are suitable materials for hole and electron infusion, respectively. LiGaY₂ shows a high electronegativity as compared to LiTiY₂, which indicates that LiGaY₂ offers advantages to enhance electron and hole mobility. The refractive index for LiGaY₂ increases from LiGaS₂ to LiGaSe₂ to LiGaTe₂, while for LiTiY₂, the highest and the lowest magnitudes are observed for LiTiTe₂ and LiTiSe₂, respectively. Thermochemical properties of LiXY₂ are also computed.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880867","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}