The European Physical Journal B最新文献

{"title":"Electronic structure of protein–RNA coupling: a tight-binding perspective","authors":"Hamze Mousavi,&nbsp;Ronak Emami","doi":"10.1140/epjb/s10051-026-01290-4","DOIUrl":"10.1140/epjb/s10051-026-01290-4","url":null,"abstract":"<p>In this work, we perform a detailed theoretical investigation into the electronic interactions governing protein–RNA complexes by employing a tight-binding Hamiltonian framework coupled by Green’s function methods. The RNA molecule is represented as a half-ladder network of nitrogenous bases, allowing us to evaluate three different protein structural conformations while assessing how multiple contact sites and fluctuating hopping integrals influence the system’s electronic behavior. To capture coherent electronic phenomena and suppress thermal broadening artifacts, we calculate the energy band structures (BS) and density of states (DOS) at low temperatures. Furthermore, both uniform and random configurations of hopping parameters are introduced within the RNA framework to simulate sequence diversity and structural variations. Our numerical findings demonstrate that protein–RNA binding induces notable energy level shifts and reorganizes the DOS profiles, where the intensity and location of these spectral modifications are dictated by the number of interface points, the specific protein shape, and the magnitude of the hopping links. This research emphasizes the crucial role of backbone coupling and outlines the overarching patterns of protein-induced electron delocalization along the RNA strand. Although the selected parameter sets and the low-temperature environment act as conceptual models rather than exact physiological duplicates, they offer meaningful perspectives on the underlying electronic features of these biomolecular assemblies. Ultimately, this theoretical approach establishes a robust basis for interpreting the qualitative electronic responses of biological systems, charting a path for subsequent models that integrate ambient environmental noise, base-to-base interactions, and direct empirical testing.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"99 10","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189748","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":"Zero-gain branch selection of higher-order rational solitons in a fifth-order nonlinear Schrödinger equation","authors":"Xin Zhang,&nbsp;Xiaofeng Li,&nbsp;Haihong Wang,&nbsp;Guoli Ma,&nbsp;Haotian Wang","doi":"10.1140/epjb/s10051-026-01259-3","DOIUrl":"10.1140/epjb/s10051-026-01259-3","url":null,"abstract":"<div><p>We investigate a fifth-order nonlinear Schrödinger equation, the zero- and nonzero-gain conditions on the modulation-instability resonance line acts as a branch selection of rational solutions. The modulational instability suppressing factor dictates from the generalized Darboux transformation: rogue waves with nonzero-gain, and W-shaped rational solitons with zero-gain. This zero-gain branch generates the higher-order rogue wave and the rational solitons. Asymptotic expressions confirm elastic interactions for second-order solitons and a third-order three-channel structure. Residuals validate solutions, proving modulational instability zero-gain selects rational soliton branches in higher-order models.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div><p>\u0000High-order rational soliton branch selection based on the zero-gain condition of modulation instability</p><p>This study reveals the zero-gain condition on the modulation instability (MI) resonance lines in the quintic nonlinear Schrödinger equation as a key mechanism for selecting rational wave solution branches. As shown in the figure, MI gain analysis identifies distinct stability regions:</p><ol>\u0000 <li>\u0000 <span>1.</span>\u0000 \u0000 <p>Non-zero gain branch: a rogue wave structure with dual temporal and spatial localization.</p>\u0000 \u0000 </li>\u0000 <li>\u0000 <span>2.</span>\u0000 \u0000 <p>Zero-gain branch: The selected propagating W-shaped rational soliton exhibits a distinctive peak-valley structure on the background wave and demonstrates channel characteristics of elastic interactions in higher-order scenarios.</p>\u0000 \u0000 </li>\u0000 </ol><p>This discovery establishes the MI zero-gain condition as an algebraic selection criterion for transitioning from linear analysis to precise nonlinear solution structures.</p></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"99 10","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189749","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":"Rutile-phase titanium dioxide for a stable picosecond erbium-doped fiber soliton laser","authors":"Xian Li,&nbsp;Zairong Zhang,&nbsp;Hanling Li,&nbsp;Zhongliang Zeng","doi":"10.1140/epjb/s10051-026-01289-x","DOIUrl":"10.1140/epjb/s10051-026-01289-x","url":null,"abstract":"<div><p>Semiconductor oxide materials have demonstrated significant potential in ultrafast laser device owing to their broadband spectral response, high damage resistance, and excellent physicochemical stability. In this work, we prepared a rutile-phase titanium dioxide (TiO₂) nanofilm, experimental results show that by integrating the saturable absorber (SA) into a ring fiber cavity, stable conventional soliton mode-locking operation was achieved, with a center wavelength of 1559.49 nm, a 3 dB spectral bandwidth of 16.60 nm, a pulse duration of 1.01 ps, a fundamental repetition rate of 22.1 MHz, and a signal-to-noise ratio (SNR) of 68.61 dB in the radio frequency (RF) spectrum. The prepared TiO₂ exhibits a modulation depth of 5.96% and a saturation intensity of 0.7149 MW/cm². This study verifies the feasibility of rutile-phase TiO₂ as an efficient and stable SA for 1.5 μm band ultrafast fiber laser.</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":"99 10","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189750","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":"Modulating a chirped Gaussian soliton with third-order dispersion","authors":"Yang Wang,&nbsp;Weijia Zhao,&nbsp;Yangyang Peng,&nbsp;Xiangxin Wang,&nbsp;Liyuan Ye,&nbsp;Yan Zhou","doi":"10.1140/epjb/s10051-026-01285-1","DOIUrl":"10.1140/epjb/s10051-026-01285-1","url":null,"abstract":"<div><p>As optical soliton propagates in optical fiber system, higher-order dispersion plays an important role when optical soliton’s higher-order dispersion length is less than or equal to second-order dispersion length. In this study, a chirped Gaussian soliton with consideration of third-order dispersion is theoretically modulated, in a single-mode optical fiber system. Six different parameters of the propagated chirped Gaussian soliton are varied, to modulate input soliton’s temporal and frequency properties. Output pulse shapes and optical spectra that after modulation have unique variation characteristics in orthogonally polarized directions, as different soliton parameters change. For example, it is found that through changing propagation distances and pulse chirps of separated orthogonal components, oscillated pulse tails may occur for both output orthogonal components. Orthogonal output optical spectra maintain their states under the variations of propagation distances, while obvious changes (peak intensities and bandwidths) may occur for output orthogonal optical spectra when pulse chirps change. This study further explores the influence of higher-order dispersion on extra-cavity modulating solitons that propagate in nonlinear optical systems.</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":"99 10","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189070","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":"Elastic and magnetoelastic constants of Y3-xFe5+xO12 garnets: polycrystalline-to-single crystalline approximations","authors":"D. J. Parekh,&nbsp;P. U. Sharma,&nbsp;S. P. Kanabar,&nbsp;N. S. Kanani,&nbsp;N. H. Vasoya,&nbsp;K. B. Modi","doi":"10.1140/epjb/s10051-026-01253-9","DOIUrl":"10.1140/epjb/s10051-026-01253-9","url":null,"abstract":"<div><p>The growth and characterization of single crystalline materials require considerable experimental expertise and cumbersome evaluation. Estimating the physical properties of single crystals from their polycrystalline counterparts is a topic of considerable scientific interest. A close agreement between elastic theory-derived zero-porosity-corrected values of longitudinal (<i>L</i>₀) and rigidity modulus (<i>G</i>₀) for polycrystalline Y₃Fe₅O₁₂ and longitudinal (<i>C</i>₁₁) and shear (<i>C</i>₄₄) stiffness constants for single crystalline equivalent has been found. This prompted the approximation of elastic, magnetoelastic, and magnetostriction constants for single crystalline analogs of the garnet series Y_3-<i>x</i>Fe_5+<i>x</i>O₁₂, with <i>x</i> = 0.0, 0.1, 0.3, and 0.5. The elastic stiffness constants (<i>C</i>₁₁, <i>C</i>₁₂, and <i>C</i>₄₄), magnetoelastic coupling constants (<i>b</i>₁ and <i>b</i>₂), and interatomic force constant (<i>f</i>) are found to decrease. The elastic compliance constants (<i>S</i>₁₁, <i>S</i>₁₂, and <i>S</i>₄₄) are found to increase while magnetostriction constants (λ₁₀₀, λ₁₁₁, λ₁₁₀) and λ_<i>S</i> show random variations with Fe³⁺ substitution. The Cauchy pressure (<i>P</i>_<i>c</i>) monotonically increases for <i>x</i> = 0.1–0.5 compositions. The results have been explained based on the large size and magnetic moment mismatch of Y³⁺ (0.89 Å, 0 μ_B)- and Fe³⁺ (0.645 Å, 5 μ_B)-induced structural and electronic distortions, lattice strain, and antisite disorder. In addition to qualitative analysis, quantitative analysis to explain the variation of λ₁₁₁ and <i>f</i> versus <i>x</i> has been given.</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":"99 10","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189073","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":"Ising diatomic molecules in the mean-field and exact recursion relations approach","authors":"Erhan Albayrak","doi":"10.1140/epjb/s10051-026-01291-3","DOIUrl":"10.1140/epjb/s10051-026-01291-3","url":null,"abstract":"<p>This research utilizes a mean field theory (MFT) on spin-1/2 diatomic molecules for the first time to obtain the thermal changes in magnetizations for each molecule, thus generating the phase diagrams. The same model was also studied using the Bethe lattice (BL) approach in terms of the exact recursion relations (ERR) in order to compare its results with the MFT results. Different types of bilinear interaction parameters between the constituents of a molecule and nearest-neighbor (NN) molecules were assumed, and the coordination number is set to three, corresponding to the honeycomb lattice. It is found that the MFT only gives second-order phase transitions, but the ERR approach gives various phase transitions. The obtained results show that the ERR approach on the BL is superior over the MFT since it provides many more details of the model.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"99 10","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189074","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":"Biswas–Chatterjee–Sen (BChS) kinetic exchange opinion model on modular networks","authors":"Hrishidev Unni,&nbsp;Soumyajyoti Biswas,&nbsp;Anirban Chakraborti","doi":"10.1140/epjb/s10051-026-01273-5","DOIUrl":"10.1140/epjb/s10051-026-01273-5","url":null,"abstract":"<p>We study opinion formation in a society where agents interact on a modular network generated using a stochastic block model (SBM). Opinion dynamics is modelled through the Biswas–Chatterjee–Sen (BChS) kinetic exchange model, in which agents undergo pairwise interactions that could be positive or negative. By tuning the relative strength of intra- and inter-group connectivity inherent to the SBM, as well as the disagreement probability, we identify distinct collective phases. In particular, we observe a robust regime with strong intra-group ordering but no global consensus, in addition to fully ordered and disordered states. In the particular case of two modules, we observe an anti-ferromagnetic type ordering with the increase of negative interaction between the groups. We investigate these ordering regimes using approximate analytical calculations and numerical simulations. These results demonstrate how modular interaction structure can qualitatively alter collective opinion dynamics and hinder consensus formation.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"99 10","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189251","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":"Dark-soliton solutions for a variable-coefficient Kundu–Eckhaus equation in inhomogeneous optical fibers","authors":"Guo-Hong Yang,&nbsp;Xue-Hui Zhao,&nbsp;Zhong-Zhou Lan","doi":"10.1140/epjb/s10051-026-01272-6","DOIUrl":"10.1140/epjb/s10051-026-01272-6","url":null,"abstract":"<p>To account for the inhomogeneity of optical fiber media, we investigate a variable-coefficient Kundu–Eckhaus equation for optical pulse propagation. Under the integrable coefficient constraints, dark one-, two-, and three-soliton solutions are derived by means of gauge transformation and Hirota bilinear method. The results show that the variable coefficient <i>r</i>(<i>x</i>) mainly modulates the soliton trajectories, while both overtaking and head-on collisions of dark solitons remain elastic.</p><p>Inhomogeneous optical fibers are described by a variable-coefficient Kundu–Eckhaus equation. Via gauge transformation and Hirota bilinear method, we derive dark one-, two- and three-soliton solutions. The dispersion coefficient r(x) modulates soliton trajectories without altering intrinsic soliton profiles. Both overtaking and head-on collisions of dark solitons are elastic under integrable coefficient constraints</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"99 10","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188967","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":"Polylogarithmic structure of Bragg diffraction in finite-coherence lattices","authors":"Evangelos G. Filothodoros","doi":"10.1140/epjb/s10051-026-01279-z","DOIUrl":"10.1140/epjb/s10051-026-01279-z","url":null,"abstract":"<p>We develop a polylogarithmic structure for Bragg diffraction based on a weighted multi-plane interference model. Within this kind of construction, the scattering amplitude is expressed as a polylogarithmic generating function. By introducing extra contributions with power-law and the usual exponential decay, it takes the form <span>(F(q) = textrm{Li}_mleft( e^{i qd - epsilon }right) )</span>, where <span>(epsilon )</span> is a finite coherence length. In the infinite-coherence limit, Bragg enhancement is associated with the approach of the polylogarithmic argument to its boundary singular point <span>(z=1)</span>. This formulation provides a compact analytical framework for describing diffraction line shapes within a generalized correlation model in which peak positions, widths, and line shapes arise from a single analytic structure. Although we are able to recover the standard Bragg law for ideal crystals, the polylogarithm model captures deviations due to finite correlation length, disorder and non-uniform lattice coherence. We show that if Bragg peaks correspond to boundary singularities of the polylogarithm, a connection between diffraction theory and complex analysis arises. The proposed theoretical model may be particularly relevant for disordered or partially coherent materials, where conventional diffraction models often require additional phenomenological broadening assumptions.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"99 10","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188893","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":"Stochastic transitions between neutral and bimodal affective states under contradictory stimulation","authors":"Renato Vieira dos Santos","doi":"10.1140/epjb/s10051-026-01275-3","DOIUrl":"10.1140/epjb/s10051-026-01275-3","url":null,"abstract":"<p>A person opens their news feed and finds, in rapid succession, a story that inspires hope and another that provokes outrage. This alternation between contradictory emotional valences is the ordinary texture of contemporary media environments. What are the long-term consequences of such <i>contradictory stimulation</i> on an individual’s core affective state—the continuous background feeling of being comfortable or uncomfortable, well or unwell, that colours all emotional experience? Could the long-term consequences depend less on the content of any single message than on the statistical structure of the stream’s inconsistency? We capture this structure in a minimal stochastic model that treats the strength of external influence as a fluctuating parameter, yielding a stochastic differential equation with multiplicative noise. Its stationary distribution reveals two regimes that defy straightforward intuition. Intense contradiction does not amplify engagement but instead drives the affective state toward neutrality—a form of apathy in which sustained affect is suppressed altogether; exact neutrality occurs only when the default bias vanishes. Conversely, moderate contradiction with strong influence produces bimodal affective instability, with random alternation between two well-separated emotional states that arise from intra-individual dynamics rather than social polarization. A systematic mapping of the parameter space reveals a region of robust bimodality for low regulatory capacity and a region of enhanced fragility for near-neutral default bias. We offer this model as a preliminary exploration rather than a definitive account, and we hope its analytical transparency will invite empirical testing and further theoretical development.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"99 10","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-026-01275-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132641","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}