The European Physical Journal B最新文献

{"title":"Correction to: Topology of contact points in Lieb–kagomé model","authors":"G. Abramovici","doi":"10.1140/epjb/s10051-025-01094-y","DOIUrl":"10.1140/epjb/s10051-025-01094-y","url":null,"abstract":"","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 11","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145561049","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":"Multi-scroll chaotic attractors and Poincaré maps via oscillating Gaussian potential","authors":"Mengran Li,&nbsp;Yunjie Tang,&nbsp;Qian Chen,&nbsp;Chengyue Zhang,&nbsp;Rong Gui,&nbsp;Guanghui Cheng","doi":"10.1140/epjb/s10051-025-01090-2","DOIUrl":"10.1140/epjb/s10051-025-01090-2","url":null,"abstract":"<div><p>Designing chaotic systems based on the physical mechanism to generate controllable chaotic attractors with specific structures is instrumental in advancing our understanding of chaotic dynamics and promoting engineering applications. By introducing the oscillating Gaussian potential, a novel Duffing system is developed, in which the stability of equilibrium points undergoes periodic alternation. This alternation effectively increases the total number of both stable and unstable points, thereby leading to the generation of additional scrolls in the chaotic attractor. Leveraging the physical interpretability of the Duffing framework, the number of scrolls can be controlled by tuning key parameters, including the potential difference, oscillation amplitude and frequency, and damping coefficient, as confirmed by bifurcation analysis. The Poincaré maps exhibit a multi-scroll structure that evolves synchronously with the potential well oscillation, demonstrating the unique dynamic behavior induced by alternating equilibrium points. In this regime, particles are successively attracted and repelled as the equilibrium points periodically switch between stable and unstable states. The system also exhibits both homogeneous and heterogeneous multistability. Finally, our results were verified through hardware experiments based on microcontrollers.</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 11","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145561471","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":"Compensation in trilayered anisotropic 6-state clock model","authors":"Olivia Mallick,&nbsp;Muktish Acharyya","doi":"10.1140/epjb/s10051-025-01091-1","DOIUrl":"10.1140/epjb/s10051-025-01091-1","url":null,"abstract":"<p>The equilibrium behaviours of a trilayered 6-state clock model have been investigated by Monte Carlo simulation. The intralayer interaction is considered ferromagnetic, whereas the interlayer interaction is antiferromagnetic. Periodic boundary conditions (PBC) are applied in XY plane and open boundary condition (OBC) is applied along Z-direction. The thermodynamic behaviours of sublattice magnetisation, total magnetisation, magnetic susceptibility and the specific heat are studied as functions of the temperature. The interesting compensation phenomenon, when the total magnetisation vanishes keeping the nonzero sublattice magnetisations, has been observed. The compensation temperature and the critical temperature are found to depend on the strength of single-site anisotropy. The comprehensive phase diagram is shown in the temperature-anisotropy plane. The larger systems show the growth of the height of the peak of the susceptibility near the critical temperature.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 11","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145561148","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":"The impact of heterogeneous recovery rates on traffic-driven epidemic spreading","authors":"Xing-Li Jing,&nbsp;Jie Chen,&nbsp;Yan-Qiang Li","doi":"10.1140/epjb/s10051-025-01089-9","DOIUrl":"10.1140/epjb/s10051-025-01089-9","url":null,"abstract":"<p>Traffic-driven epidemic spreading has been widely studied, but the influence of heterogeneous recovery rates—common in real-world epidemic scenarios—has received limited attention. In this paper, we present a traffic-driven epidemic spreading model that incorporates heterogeneous recovery rates, reflecting the uneven distribution of medical resources in practical systems. We investigate how this heterogeneity impacts key epidemic dynamics, including the spreading speed, steady-state infection density, and epidemic threshold. The results demonstrate that nodal recovery heterogeneity significantly alters progression dynamics. Specifically, by strategically adjusting the distribution of recovery rates, the spread of the epidemic can be effectively controlled or even completely suppressed. These findings highlight the importance of considering recovery rate heterogeneity in epidemic modeling and offer valuable insights for optimizing epidemic prevention and control strategies in real-world traffic systems.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 11","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145560920","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":"Controlling quantum phases with step-like electric potentials in one-dimensional Hubbard systems","authors":"D. Arisa,&nbsp;R. M. Dos Santos,&nbsp;I. M. Carvalho,&nbsp;V. V. França","doi":"10.1140/epjb/s10051-025-01080-4","DOIUrl":"10.1140/epjb/s10051-025-01080-4","url":null,"abstract":"<p>Quantum systems under electric potentials provide a powerful framework for uncovering and controlling novel quantum phases, especially in low-dimensional systems with strong correlations. In this work, we investigate quantum phase transitions induced by a step-like electric potential in a one-dimensional half-filled Hubbard chain. By analyzing <i>i)</i> tunneling energy and local doublon response, <i>ii)</i> charge and spin gaps, and <i>iii)</i> entanglement between the chain halves, we identify three distinct phases: Mott insulator, metal and band-like insulator. The metallic regime, characterized by the closing of both charge and spin gaps, is accompanied by a electric-potential dependence of kinetic energy and a quasi-periodic oscillatory behavior of local doublon response and entanglement. Although the metallic phase persists for different magnetizations, its extent in the phase diagram shrinks as spin polarization increases.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 11","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145561419","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":"Unveiling the role of 3d, 4d, and 5d transition metals in Pt-based half-Heusler alloys: structural, electronic, and optical properties from hybrid DFT","authors":"Mohamed Benallal,&nbsp;Salem Hebri,&nbsp;Amina Belkadi,&nbsp;Imad Khaled Bensafa","doi":"10.1140/epjb/s10051-025-01085-z","DOIUrl":"10.1140/epjb/s10051-025-01085-z","url":null,"abstract":"<div><p>In this work, we present a comprehensive first-principles investigation of a new family of Pt-based half-Heusler alloys with the general formula PtYZ (Y = V, Nb, Ta; Z = Al, Ga, In), all satisfying the 18-valence-electron rule and exhibiting semiconducting behavior. The alloys preferentially crystallize in the type-III structure, fulfilling the Born–Huang mechanical stability criteria, with Pugh’s and Poisson’s ratios indicating ductile and predominantly ionic bonding. Phonon dispersion calculations, performed for representative compounds, further confirm their dynamical stability. The HSE06 hybrid functional significantly refines the electronic description, yielding band gaps from −0.05 to −1.0 eV and revealing a clear trend of increasing d-orbital delocalization from 3d (V) to 5d (Ta) elements. Optical simulations show strong absorption across the visible and ultraviolet regions, with a redshift toward the visible–NIR range for V-based alloys. The combination of mechanical robustness, tunable band gaps, and favorable optical absorption highlights these Pt-based half-Heusler alloys as promising candidates for solar cell and optoelectronic applications, expanding the design space of functional semiconducting Heusler compounds and providing valuable guidance for future experimental studies.</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 11","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145510410","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":"The half-metallic behavior of novel Ti2-based ternary Heusler compounds: ab initio study","authors":"A. Bentouaf,&nbsp;F. Benaddi,&nbsp;M. Berrahal,&nbsp;A. Azzouz Rached,&nbsp;M. E. A. Belhadj","doi":"10.1140/epjb/s10051-025-01086-y","DOIUrl":"10.1140/epjb/s10051-025-01086-y","url":null,"abstract":"<div><p>We investigated the magneto-electronic, structural, mechanical, and thermal properties of a novel family of Ti₂RhX (X = Si, Ge, and Sn) ternary Heusler alloys using the full-potential linearized augmented plane wave (FP-LAPW) method as implemented in the Wien2k code. The results reveal that all compounds are ferrimagnetic with negative formation energies, indicating thermodynamic stability and feasibility for experimental synthesis. Electronic band structure and density of states calculations confirm their half-metallic ferrimagnetic character, with spin polarization near the Fermi level and minority-spin band gaps of approximately 0.1–0.3 eV. Mechanical analysis based on elastic constants shows that these materials are ductile, with high Young’s modulus and Pugh’s ratio exceeding 1.75. Thermal properties were examined using the quasi-harmonic Debye model and non-equilibrium Gibbs functions, yielding temperature- and pressure-dependent trends in heat capacity, bulk modulus, Debye temperature, and thermal expansion coefficients. These findings suggest that Ti₂RhX alloys are promising candidates for spintronic applications and pave the way for further theoretical and experimental investigations.</p><h3>Graphical abstract</h3><p>\u0000We extensively studied Ti2RhX (X = Si, Ge, Sn) Heusler alloys using advanced FP-LAPW methods, unveiling their ferrimagnetic nature, stiffness, and half-metallic ferrimagnetic behavior. Our research also probed their thermal properties and provided a foundational understanding for potential applications.</p><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 11","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145510773","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":"Artificial neural network framework for MHD micropolar nanofluid flow over stretching surfaces with thermal source","authors":"R. Manojkumar,&nbsp;S. Sridhar,&nbsp;D. Prabu,&nbsp;S. Karthikeyan","doi":"10.1140/epjb/s10051-025-01087-x","DOIUrl":"10.1140/epjb/s10051-025-01087-x","url":null,"abstract":"<p>This study conducts a thorough examination of two-dimensional, incompressible magnetohydrodynamic (MHD) micropolar nanofluid flow over a stretching sheet, with particular attention to internal heat generation and convective boundary conditions. The primary objective is to establish an effective hybrid computational framework that integrates numerical methods with Artificial Neural Networks (ANN) to accurately analyze velocity, temperature, microrotation, and nanoparticle concentration fields within such intricate flow systems. The specific aims include investigating the influence of Brownian motion, thermophoresis, magnetic field strength, and viscoelastic parameters on fluid flow and heat/mass transfer characteristics, as well as assessing the predictive capability of ANN models. The study analyzes two-dimensional MHD micropolar nanofluid flow over a stretching sheet with heat generation and convective boundary conditions, incorporating Brownian motion and thermophoresis effects. Numerical (bvp4c) and ANN approaches reveal reliable predictions for velocity, temperature, and concentration, with applications in biomedical engineering, thermal management, and material processing.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 11","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145510287","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":"Machine learning approach to predict the spacer layer thickness-dependent tunnel magnetoresistance in organic magnetic tunnel junctions","authors":"Debarati Nath,&nbsp;Debajit Deb,&nbsp;Joseph Roy,&nbsp;Pamulapati Soujanya","doi":"10.1140/epjb/s10051-025-01083-1","DOIUrl":"10.1140/epjb/s10051-025-01083-1","url":null,"abstract":"<div><p>A machine learning framework has been established to predict the thickness-dependent Spintronic Device characteristics (<i>R</i>_P: Parallel Resistance, <i>R</i>_AP: Antiparallel Resistance, TMR: Tunnel Magnetoresistance (%), STT-IN: In-plane Spin Transfer Torque, STT-OUT: Out of Plane STT) versus voltage behaviour for Organic Magnetic Tunnel Junction (MTJ) devices (<i>x</i>/Rubrene/Co, <i>x</i> = La₂O₃, LaMnO₃, La_0.7Ca_0.3MnO₃, La_0.7Sr_0.3MnO₃). Machine learning (ML) analysis reveals that variation in thickness and interfacial scattering strongly influence spintronic parameters. With proper hyperparameter tuning of the polynomial linear regression and support vector regression model, resistance profiles are well predicted for three MTJs, except La₂O₃. The spin-split band structure of La₂O₃ exhibits a higher density of electronic states near the Fermi level, which modifies the spin-dependent tunnelling behaviour; consequently, spin-flip-related transport requires more complex models. Optimised Gaussian process regression model with multiple kernels not only accurately predicts MTJ TMR responses across voltages and barrier thicknesses but also captures both simple and complex physical relationships arising from different physical effects. In La₂O₃, the ML model fails to capture in-plane and out-of-plane STT responses due to weak magnetic coupling between the electrodes, which abruptly enhances spin-damping compensation with changing barrier thickness. In contrast, varying model complexity in three MTJs, except La₂O₃, provides insights into underlying transport mechanisms, such as spin-flip scattering and spin-damping compensation. Our findings indicate that by leveraging ML approaches, unexplored TMR responses can be predicted for different thickness and voltage settings, when the transport physics of the MTJ are consistent. By utilising simulation and ML models, the study provides significant insights into achieving high TMR for next-generation memory, logic, and quantum technologies. The approach not only enables accurate prediction of MTJ performance but also reduces computational and experimental requirements, whilst simultaneously offering valuable information on device physics after visualising various parameters.</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 11","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145456303","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":"Quench below the critical temperature in the Ising model: asymptotic state versus equilibrium under various boundary conditions","authors":"Annalisa Fierro,&nbsp;Antonio Coniglio,&nbsp;Marco Zannetti","doi":"10.1140/epjb/s10051-025-01082-2","DOIUrl":"10.1140/epjb/s10051-025-01082-2","url":null,"abstract":"<p>The nature of the asymptotic state toward which the system evolves after a quench to below the critical temperature has been recently addressed in the Ising model through exact results, scaling arguments, and numerical simulations. It has been suggested that this state is critical. While this may seem trivial, given that domain coarsening fundamentally involves the unbounded growth of a time-dependent correlation length, which roughly matches the average domain size, the situation is more complex. This complexity arises from the presence of a critical state below the critical temperature, which sharply contradicts the usual Ising equilibrium picture, characterised by symmetry breaking, ferromagnetic order, and short-range correlations. We aim to clarify this issue by analysing the subtle yet crucial role of boundary conditions.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 11","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145456576","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}