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

Three-dimensional Lie algebras of Kundt type Kundt型三维李代数

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-03 DOI: 10.1140/epjp/s13360-026-07949-2

Aissa Meliani

引用次数: 0

Characterizing the Carnot cycles at absolute zero: a reply to “Comment on ‘Proof of the Nernst theorem’” 绝对零度下卡诺环的特征：对“关于‘能斯特定理证明’的评论”的回复

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-03 DOI: 10.1140/epjp/s13360-026-08111-8

José-María Martín-Olalla

引用次数: 0

Effects of nonlocal interactions on s- and d-wave superconducting correlations in the extended Hubbard model 扩展Hubbard模型中非局域相互作用对s波和d波超导相关的影响

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-03 DOI: 10.1140/epjp/s13360-026-08122-5

Pavol Farkašovský

{"title":"Effects of nonlocal interactions on s- and d-wave superconducting correlations in the extended Hubbard model","authors":"Pavol Farkašovský","doi":"10.1140/epjp/s13360-026-08122-5","DOIUrl":"10.1140/epjp/s13360-026-08122-5","url":null,"abstract":"<div><p>We investigate the influence of nonlocal interactions on superconducting correlations within the extended Hubbard model. In addition to the on-site Coulomb interaction and nearest-neighbor hopping, we include next-nearest-neighbor hopping together with several physically relevant nonlocal terms, namely nearest-neighbor Coulomb interaction, correlated hopping, exchange interaction, and pair hopping. Using Lanczos exact diagonalization on a <span>(4times 4)</span> cluster, supported by projector quantum Monte Carlo simulations for selected parameter regimes, we analyze pairing correlations in both the <i>s</i>- and <i>d</i>-wave channels. We demonstrate that nonlocal interactions exert a highly nontrivial and symmetry-dependent influence on superconducting correlations. While the on-site repulsion in cooperation with next-nearest-neighbor hopping enhances <i>d</i>-wave pairing tendencies, correlated hopping and nearest-neighbor Coulomb interaction strongly promote <i>s</i>-wave correlations, whereas exchange and pair-hopping interactions can efficiently suppress superconductivity beyond relatively small critical strengths. When all nonlocal interactions are considered simultaneously, the resulting phase diagrams reveal a complex interplay and competition between different pairing symmetries. Our results highlight the crucial role of extended interactions in shaping the pairing landscape of strongly correlated systems and demonstrate that a comprehensive treatment beyond the minimal Hubbard model is essential for a realistic description of unconventional superconductivity.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-026-08122-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Thermal signatures of mutations in DNA DNA突变的热特征

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-03 DOI: 10.1140/epjp/s13360-026-08133-2

Sourav Kundu

引用次数: 0

Angular correlations as a probe of hidden sectors at the FCC-ee 角相关性作为FCC-ee隐藏部门的探测

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-03 DOI: 10.1140/epjp/s13360-026-08107-4

E. Musumeci, A. Irles, R. Perez-Ramos, I. Corredoira, E. Sarkisyan-Grinbaum, V. A. Mitsou, M. A. Sanchis-Lozano

引用次数: 0

Exact anisotropic Bianchi type-I classes in modified teleparallel f(T) gravity and their cosmological implications 修正遥平行f(T)引力的精确各向异性Bianchi i型类及其宇宙学意义

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-03 DOI: 10.1140/epjp/s13360-026-08102-9

Arshad Ali, Noura M. Alhouiti, Fiaz Hussain, Usama Nawaz

{"title":"Exact anisotropic Bianchi type-I classes in modified teleparallel f(T) gravity and their cosmological implications","authors":"Arshad Ali, Noura M. Alhouiti, Fiaz Hussain, Usama Nawaz","doi":"10.1140/epjp/s13360-026-08102-9","DOIUrl":"10.1140/epjp/s13360-026-08102-9","url":null,"abstract":"<div><p>Exact anisotropic solutions provide controlled non-FLRW sectors for testing the background dynamics of modified teleparallel <i>f</i>(<i>T</i>) gravity beyond the usual homogeneous and isotropic setting. We construct five exact Bianchi type-I branches from the directional field equations and determine, for each branch, the torsion scalar and the corresponding branch-compatible torsional function. Their dynamics are classified through the directional expansion, mean expansion, shear evolution, normalized anisotropy, acceleration, and jerk behavior. We find two genuinely expanding anisotropic branches and three volume-preserving anisotropic deformations. The expanding branches exhibit accelerated or nontrivial average expansion, but retain finite normalized anisotropy and hence do not approach an FLRW limit. This residual anisotropy should not be interpreted as a late-time replacement for the nearly isotropic FLRW Universe indicated by CMB observations. Instead, the exact branches provide controlled anisotropic backgrounds for testing whether modified teleparallel dynamics can generate average expansion, suppress shear, or approach isotropization from non-FLRW initial data. We further test the effective source sector using the energy density, directional pressures, equation-of-state parameters, and standard energy conditions. Although the effective density can remain positive, the null, dominant, and strong energy conditions impose direction-dependent restrictions. For the expanding branch with the clearest thermodynamic interpretation, we also derive the temperature, entropy density, total entropy, and a second-law diagnostic. The analysis shows that exact solvability in anisotropic <i>f</i>(<i>T</i>) cosmology is not sufficient for physical viability; kinematics, effective-source constraints, and thermodynamic consistency must be assessed simultaneously.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Investigation of dielectric and electrical properties of Ruddlesden–Popper perovskite material: Sr3Ti2O7 Ruddlesden-Popper钙钛矿材料Sr3Ti2O7介电性能研究

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-03 DOI: 10.1140/epjp/s13360-026-08092-8

Anjali Antony, Alok Shukla, Sushil Joshi, R. N. P. Choudhary

{"title":"Investigation of dielectric and electrical properties of Ruddlesden–Popper perovskite material: Sr3Ti2O7","authors":"Anjali Antony, Alok Shukla, Sushil Joshi, R. N. P. Choudhary","doi":"10.1140/epjp/s13360-026-08092-8","DOIUrl":"10.1140/epjp/s13360-026-08092-8","url":null,"abstract":"<div><p>A Ruddlesden–Popper (RP) layered perovskite Sr<sub>3</sub>Ti<sub>2</sub>O<sub>7</sub> was synthesised using a cost-effective solid-state method at high temperature. This study presents details on the synthesis and functional properties of the Sr<sub>3</sub>Ti<sub>2</sub>O<sub>7</sub> ceramic. X-ray diffraction (XRD) analysis confirms the formation of the RP phase along with some secondary phases. Field emission scanning electron microscopy (FE-SEM) reveals the surface morphology, indicating the polycrystalline nature of the material. Fourier-transform infrared (FTIR) spectroscopy highlights the bonding environment, showcasing the characteristic Ti–O vibrational modes of the RP framework. Energy-dispersive X-ray spectroscopy (EDX) verifies the elemental composition and purity of the sample. The electrical properties are thoroughly examined to understand the charge transport mechanisms in Sr<sub>3</sub>Ti<sub>2</sub>O<sub>7</sub>. The electrical behaviour was studied through the dielectric constant, tangent loss, impedance, modulus, and ac conductivity spectra over a selected frequency and temperature range. The Nyquist plot reveals an NTCR nature corresponding to (RQC)(RC) circuit model, and modulus analysis indicates a non-Debye type of relaxation. The polarisation-electric field (P-E) hysteresis loop measurement is recorded to understand the field-induced polarisation characteristics, showing a leaky ferroelectric behaviour with a remanent polarisation of 0.015 μC/cm<sup>2</sup>. The overall structural and electrical characterisation indicates that Sr<sub>3</sub>Ti<sub>2</sub>O<sub>7</sub> ceramic exhibits excellent dielectric properties, making it suitable for use in modern electronic devices, such as capacitors, tunable dielectrics, and other functional oxide-based components.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Effect of ambient magnetic field on surface plasma wave-assisted second harmonics over metal surfaces embedded with carbon nanotubes 环境磁场对嵌入碳纳米管的金属表面等离子体波辅助二次谐波的影响

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-03 DOI: 10.1140/epjp/s13360-026-08067-9

Kaisar Ali, Sujeet Kumar, Asheel Kumar, Ashish Varma

{"title":"Effect of ambient magnetic field on surface plasma wave-assisted second harmonics over metal surfaces embedded with carbon nanotubes","authors":"Kaisar Ali, Sujeet Kumar, Asheel Kumar, Ashish Varma","doi":"10.1140/epjp/s13360-026-08067-9","DOIUrl":"10.1140/epjp/s13360-026-08067-9","url":null,"abstract":"<div><p>A laser targeted at the surface of metal mounted with a carbon nanotube structure triggers thermal and structural changes. The incident laser generates a surface plasma wave at the metal–air interface using the attenuated total reflection configuration technique. The excited surface plasma wave exerts a ponderomotive force on the electrons of carbon nanotubes, which generates a nonlinear surface current that leads to the production of efficient resonant second harmonics. The externally applied transverse magnetic field assists the photon of SPW (electromagnetic wave) and effectively enhances the second harmonics. The resonant frequency at which the second harmonic amplitude is maximum is determined. The numerical outcome shows the efficient harmonic generation by surface plasma wave in the presence of a magnetic field. We explore the dependency of various parameters on the second harmonics, like the length and radius of the nanotube, laser intensity, the decentered parameter associated with the hyperbolic cosine function, the amplitude of the surface plasma wave, the separation distance between two consecutive nanotubes, and the cyclotron frequency. This scheme provides an alternative model for generating efficient second harmonics using a laser mode-converted surface plasma wave rather than a direct laser. The generated second harmonic radiation can be useful for various purposes, such as medical diagnostics and optical communication.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

TARDIS Lab: infrastructure for characterization and assembly of highly granular silicon calorimeter modules for LUXE and future Higgs Factories TARDIS实验室：为LUXE和未来的希格斯工厂表征和组装高颗粒硅量热计模块的基础设施

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-03 DOI: 10.1140/epjp/s13360-026-08124-3

Melissa Almanza-Soto, César Blanch, Shan Huang, Adrián Irles, Carlos Orero

{"title":"TARDIS Lab: infrastructure for characterization and assembly of highly granular silicon calorimeter modules for LUXE and future Higgs Factories","authors":"Melissa Almanza-Soto, César Blanch, Shan Huang, Adrián Irles, Carlos Orero","doi":"10.1140/epjp/s13360-026-08124-3","DOIUrl":"10.1140/epjp/s13360-026-08124-3","url":null,"abstract":"<div><p>The TARDIS Lab has been established at IFIC (CSIC–UV) to develop infrastructure and expertise in high-granularity silicon calorimetry. The laboratory provides an ISO7 clean-room environment and dedicated instrumentation for silicon sensor characterization and ultra-thin calorimeter module assembly. It supports developments of silicon-based high-granularity calorimetry concepts pursued within CERN DRD Calo (DRD6) and the FCAL Collaboration. These developments serve not only as technological prototypes of the electromagnetic calorimeters and luminometers at future Higgs-factory proposals (FCC-ee, Linear Collider Facility at CERN, International Linear Collider, etc.) but are also essential for the strong-field QED program of the LUXE experiment. We describe the laboratory infrastructure, assembly workflows and DESY test-beam validation of fully assembled calorimeter modules. The assembled ECALp modules have an average thickness of approximately 760 µm, while laboratory tests of 4352 channels identified connectivity problems in only 0.5% of them. For the two SiWECAL modules assembled in 2025, connectivity problems were observed at the level of approximately <span>(10^{-3})</span> of the instrumented pads, with no mechanical failures or sensor delamination after transport and beam operation. We also present ongoing infrastructure upgrades and production milestones for 2026–2027.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-026-08124-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Bifurcations, multistability, and chaos in a three-level intraguild predation model with Michaelis–Menten-type harvesting on both predators michaelis - menten型捕获的三层野生捕食模型的分岔、多稳定性和混沌

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-01 DOI: 10.1140/epjp/s13360-026-08120-7

Petar Ćirković

{"title":"Bifurcations, multistability, and chaos in a three-level intraguild predation model with Michaelis–Menten-type harvesting on both predators","authors":"Petar Ćirković","doi":"10.1140/epjp/s13360-026-08120-7","DOIUrl":"10.1140/epjp/s13360-026-08120-7","url":null,"abstract":"<div><p>A three-level intraguild predation model is proposed by incorporating nonlinear Michaelis–Menten-type harvesting in both the intermediate and the intraguild (IG) predator populations. Positivity and boundedness of solutions are established, the existence and stability of equilibria are analyzed, and the unconditional survival of the prey species is demonstrated. The impact of harvesting on dynamics is studied in the parameter plane by varying the intermediate and IG predator harvesting rates, revealing complex dynamics characterized by both codimension-one bifurcations (saddle-node, transcritical, pitchfork, Hopf) and codimension-two (Bogdanov–Takens, Cusp, Cusp bifurcation of limit cycles, Zero-Hopf, generalized Hopf) bifurcations. Moreover, the complexity of the system’s dynamics is also reflected in the emergence of invariant sets that are more complicated than equilibrium points or limit cycles, including invariant tori and chaotic attractors. The coexistence of all three species via quasiperiodic orbits with chaotic motion is numerically shown, and the transition to chaos is confirmed through a period-doubling cascade and the computation the maximum Lyapunov exponent. The results indicate that moderate and balanced harvesting promotes biodiversity, whereas excessive or imbalanced harvesting may lead to the extinction of one or both predator populations. It is observed that, in certain parameter regions, the system exhibits bistability, tristability, and quadristability, resulting in strong sensitivity to initial conditions. Unlike previous models, the present system exhibits multistable buffer regions in which coexistence is not immediately lost but depends on initial population levels.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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