The European Physical Journal B最新文献

{"title":"Two-layer network evolutionary game model applied to complex systems","authors":"Liming Zhang,&nbsp;Ming Cai,&nbsp;Yingxin Zhang,&nbsp;Shuai Wang,&nbsp;Yao Xiao","doi":"10.1140/epjb/s10051-024-00809-x","DOIUrl":"10.1140/epjb/s10051-024-00809-x","url":null,"abstract":"<p> Elements within a system undergo dynamic changes, steering its evolution. However, the heterogeneity and complex interconnections of real-world system elements make it difficult for single-layer network game methods to effectively integrate with reality and describe the evolutionary process. To tackle this issue, we propose a complex network-based two-layer evolutionary game model, applicable to complex systems. This model includes the element evolution network and the group game network. The surface layer presents the relationships and developmental trends of system elements, while the underlying layer simulates participant strategy optimization, which in turn drives the evolution of the surface layer. To enhance practical applications, this paper abstracts elements as strategies and extends the participant’s strategies into combinations of multiple strategies. This approach overcomes the limitations of finite strategy options in traditional 2<span>(times )</span>2 game models. In this paper, the cross-citation data from the literature and the Bidirectional Encoder Representations from Transformers (BERT) model are employed to measure the system evolution-related strategy values. Through mathematical reasoning, it is determined that the number of elements is a critical factor influencing time-sensitivity in simulations across various scenarios. This paper conducts a system evolution analysis using the Intelligent Transportation System (ITS) as a case study. Initially, the electric vehicle popularization (EVP) scenario, characterized by relatively mature market development, is employed for model calibration. The experimental results show that the relative error of the calibrated model is 0.3132 and the absolute error is 0.0138. Compared to traditional fitting models, the output evolutionary trajectory aligns significantly with real-world conditions. Based on the calibration parameters, an application analysis is conducted on the cooperative vehicle infrastructure (CVI) scenario, which reflects the level of intelligence in ITS. The analysis predicts market evolution trends for different levels of autonomous vehicles, providing a scientific foundation for decision-making processes within governments and enterprises.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 11","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565928","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":"Thermodynamic properties of perovskite MgSiO3 with cubic structure under extreme conditions","authors":"Hoc Quang Nguyen,&nbsp;Nhi Quynh Nguyen,&nbsp;Mai Thi Dao,&nbsp;Vien Cong Tran,&nbsp;Tra Thi Thu Lai,&nbsp;Anh Thi Van Le,&nbsp;An Thi Thuy Nguyen","doi":"10.1140/epjb/s10051-024-00804-2","DOIUrl":"10.1140/epjb/s10051-024-00804-2","url":null,"abstract":"<div><p>The article applies the thermodynamic theory built by statistical moment method (SMM) to determine numerically the temperature and pressure dependences of the thermal expansion coefficient, the heat capacity constant pressure and the Gruneisen parameter of MgSiO₃ perovskite in the temperature range from 0 to 4000 K and in the pressure range from 0 to 135 GPa. Our SMM numerical results for MgSiO₃ perovskite are compared with that for CaSiO₃ perovskite, experimental data and results calculated by other methods. Our SMM numerical results are new and predictive of experimental results. This is the first application of SMM to study the thermodynamic characteristics of cubic MgSiO₃ perovskite under extreme conditions of the Earth’s lower mantle.</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":"97 10","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524456","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":"Biaxial strain effect on Josephson supercurrent in a 2D Weyl semimetal","authors":"Chunxu Bai,&nbsp;Yanling Yang","doi":"10.1140/epjb/s10051-024-00795-0","DOIUrl":"10.1140/epjb/s10051-024-00795-0","url":null,"abstract":"<div><p>Based on the Weyl–Bogoliubov-de Gennes equation, we investigate the impact of biaxial strain on the Josephson supercurrent in a 2D Weyl semimetal Josephson junction, where the biaxial strain is induced by a piezoelectric film. It is shown that the current phase relation can be attenuated and non-monotonically modulated by the transverse and the longitudinal strain strength, respectively. When both are present, the subgap Andreev bound levels and the resulting Josephson supercurrent are sensitive to the potential energy and the length in the weak link region and the gate voltage (biaxial strain), and an enhancement or weakening of the supercurrent by shifting the Weyl nodes without requiring a magnetic or Zeeman term is induced. It is also revealed that the gate voltage (strain) can cause a supercurrent switch, where the cutoff gate voltage depends on the potential energy in the weak link region. The research also explores the temperature dependence of the supercurrent, noting a monotonic decrease and a logistic-like function with increasing temperature due to the thermal effect on subgap Andreev bound levels. The findings of this study are significant for the understanding of superconducting electronics in 2D Weyl semimetal and offering a new avenue for designing strain tunable quantum devices with all-electrical control.</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":"97 10","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524384","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":"Hidden quantization phenomenon in the sznajd model with initial structure","authors":"Nicolás E. Amado,&nbsp;Marcos E. Gaudiano,&nbsp;Jorge A. Revelli","doi":"10.1140/epjb/s10051-024-00806-0","DOIUrl":"10.1140/epjb/s10051-024-00806-0","url":null,"abstract":"<div><p>Random initial conditions are extensively used in sociophysics models. However, hierarchically organized setups were recently used, producing interesting results which are not seen in the random case. We deepen those previous works by studying an opinion dynamics model where there are two initial opposing ideological groups and a third emergent party. We assume the same amount of adherents for each initial party and focus on varying the degree of their structure. Here we introduce a new approach that uses ternary diagrams as a tool to visualize phenomena that are otherwise hidden in conventional observables (e.g., parties’ probability of winning). We were able, through these diagrams, to unveil the presence of adherence quantization when the system is highly structured. We deduce an analytical expression finding an excellent agreement with simulated results. The explanation for this quantization is based on a new type of interaction, not between individuals, but among groups of individuals.</p></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 10","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142519144","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":"Effects of pressure on the structural, electronic, and elastic properties of superconductor material with perovskite structure YBa2Cu3O7: insights from ab initio calculation","authors":"Ahmed Abou El Hassan,&nbsp;A. Labrag,&nbsp;M. Bghour,&nbsp;M. khenfouch,&nbsp;H. El Ouaddi,&nbsp;M. Baiboud,&nbsp;Y. El Arfaoui,&nbsp;H. Charkaoui","doi":"10.1140/epjb/s10051-024-00798-x","DOIUrl":"10.1140/epjb/s10051-024-00798-x","url":null,"abstract":"<div><p>Superconducting materials' crystal lattices and electronic structures have fascinated the materials science research group. In the present work, we have investigated and discussed the structural, electronic, and elastic properties of single-crystal YBa₂Cu₃O₇ under pressure up to 20 GPa using the first principal calculations based on the density functional theory (DFT). The results showed that this compound's calculated lattice parameters under zero pressure agree with the experimental results. The calculated band structures and the DOS show that YBa₂Cu₃O₇ is metallic. The width of the electronic band increases with pressure, due to the increased overlap of the orbitals. The pressure-dependent single-crystal elastic constants ensure mechanical stability. The calculated value of Poisson’s ratio (<i>n</i> ~ 0.32) suggests that the compound is ductile and that the metallic contribution dominates our material. The variations of anisotropy indices show a monotonic dependence on pressure, indicating that the studied material becomes elastically anisotropic while increasing the pressure. Debye temperature and sound velocity were calculated from the elastic constants and crystal density. They increase systematically with pressure. Our material also appears to have high Debye temperatures, indicating that it may have high thermal conductivity. Finally, we have calculated and discussed the optical properties at ambient pressure (dielectric function, absorption, refractive index, conductivity, loss function, and reflectivity) for both polarization directions [100] and [001].</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":"97 10","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524380","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":"Traffic flow dynamics and oscillation control in conserved fractal networks","authors":"Muskan Verma,&nbsp;Arvind Kumar Gupta,&nbsp;Sapna Sharma","doi":"10.1140/epjb/s10051-024-00808-y","DOIUrl":"10.1140/epjb/s10051-024-00808-y","url":null,"abstract":"<p>Traffic control serves as an indispensable component in optimizing the traffic flow, especially on networks. To analyze the varied complexity of traffic dynamics, the percolation backbone fractal network is characterized via cell-transmission model. Taking into account a generalized flow-density relation, dynamic model is modified to scrutinize the impact of transition rates on traffic flow in a conserved network. The macroscopic fundamental diagrams attained through numerical simulation are investigated for homogeneous as well as heterogeneous transition rates. For first-generation fractal network, unimodal or bimodal traffic currents are observed with respect to mean density. Further, for second-generation fractal network, two types of density waves are observed depending upon the number of vehicles present in system: uniform equilibrium state and oscillatory state. It is reported that the transition rates corresponding to singly connected nodes can control the traffic dynamics to ensure a uniform stationary flow, which cannot be achieved via the doubly connected and quadruple-connected nodes.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 10","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-024-00808-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142519143","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":"Probing electron localization and delocalization in the selective long-range tight-binding model","authors":"Mohammad Pouranvari","doi":"10.1140/epjb/s10051-024-00802-4","DOIUrl":"10.1140/epjb/s10051-024-00802-4","url":null,"abstract":"<p>In this study, we perform a detailed investigation into the interplay between disorder-induced electron localization and long-range hopping amplitudes within the Selective Long-Range Tight-Binding Model (SLRTB). Through numerical simulations, we analyze the electronic properties of the system, with a focus on the participation ratio (PR), entanglement entropy (EE), energy spectrum, and the ratio of level spacings (<span>(r_n)</span>). Our results reveal a marked distinction between negative and positive long-range hopping amplitudes, manifesting in different electronic behaviors and transitions. Notably, we carry out a finite-size scaling analysis, identifying the critical point and exponents that characterize the system’s behavior near the transition. The investigation highlights the role of gapless regions in shaping the system’s PR, <span>(r_n)</span>, and EE, and the influence of disorder on these properties. The SLRTB model proves to be an effective framework for understanding the effects of disorder and long-range hopping on electron dynamics, offering valuable insights into localization and delocalization phenomena.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 10","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518515","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":"Hidden attractors in fractional-order discrete maps","authors":"Vaibhav Varshney,&nbsp;S. Leo Kingston,&nbsp;Sabarathinam Srinivasan,&nbsp;Suresh Kumarasamy","doi":"10.1140/epjb/s10051-024-00780-7","DOIUrl":"10.1140/epjb/s10051-024-00780-7","url":null,"abstract":"<p>This study investigates the hidden dynamics of fractional-order discrete two-dimensional maps, focusing on the generation of hidden attractors and the impact of order on their size and boundaries. Three different nonlinear maps are used, and various measures, such as phase portraits, bifurcation diagrams, and basin of attraction, are presented. This study also observes changes in basin boundaries of hidden attractors with varying order. The rational memristive maps exhibit a well-defined basin of attraction for a broad range of system orders, with multistability and a riddled basin for some orders. The memristive Gauss map also shows well-defined and riddled basins, however, the quadratic chaotic map demonstrates a decreasing basin size and a riddled basin boundary for higher orders of the system.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 10","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453069","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":"Diffusion on assortative networks: from mean-field to agent-based, via Newman rewiring","authors":"L. Di Lucchio,&nbsp;G. Modanese","doi":"10.1140/epjb/s10051-024-00797-y","DOIUrl":"10.1140/epjb/s10051-024-00797-y","url":null,"abstract":"<p>In mathematical models of epidemic diffusion on networks based upon systems of differential equations, it is convenient to use the heterogeneous mean field approximation (HMF) because it allows to write one single equation for all nodes of a certain degree <i>k</i>, each one virtually present with a probability given by the degree distribution <i>P</i>(<i>k</i>). The two-point correlations between nodes are defined by the matrix <i>P</i>(<i>h</i>|<i>k</i>), which can typically be uncorrelated, assortative or disassortative. After a brief review of this approach and of the results obtained within this approximation for the Bass diffusion model, in this work, we look at the transition from the HMF approximation to the description of diffusion through the dynamics of single nodes, first still with differential equations, and then with agent-based models. For this purpose, one needs a method for the explicit construction of ensembles of random networks or scale-free networks having a pre-defined degree distribution (configuration model) and a method for rewiring these networks towards some desired or “target” degree correlations (Newman rewiring). We describe Python-NetworkX codes implemented for the two methods in our recent work and compare some of the results obtained in the HMF approximation with the new results obtained with statistical ensembles of real networks, including the case of signed networks.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 10","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453070","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":"Single-photon stimulated emission in waveguide quantum electrodynamics","authors":"O. A. Chuikin,&nbsp;Ya. S. Greenberg,&nbsp;A. A. Shtygashev,&nbsp;A. G. Moiseev","doi":"10.1140/epjb/s10051-024-00784-3","DOIUrl":"10.1140/epjb/s10051-024-00784-3","url":null,"abstract":"<p>We study the scattering of a single-photon pulse from quantum two-level system (qubit) coupled to a continuum spectrum of modes in a one-dimensional (1D) nanophotonic waveguide. We consider two different cases—single-excitation subspace, when photon is incident on a qubit in the ground state, and two-excitation subspace, when photon is incident on excited qubit. For both cases, we find the spatial distribution of photon fields inside a waveguide and derive a time-dependent analytical solution for qubit and photon amplitudes, which can be used to obtain probabilities to find excited qubit and forward or backward moving photons in different configurations. We find that incident wave has much higher probability to be transmitted through the excited qubit which is a signature of single-photon stimulated emission. This property together with a fact that a qubit in the ground state almost completely reflects resonant photons, which can be used to develop method to detect qubit state in an open waveguide. By analyzing two-photon amplitudes for photon incident on excited qubit, we show clear evidence of stimulated emission. Calculations are performed for two initial states of incident photon: plane wave and Gaussian pulse.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 10","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142447351","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}