物理最新文献

{"title":"First-principles calculations to investigate structural and electronic properties of transition metal-embedded modified 5,10,15,20-tetrakis(pentafluorophenyl) porphyrins","authors":"Zhi Li,&nbsp;Jia-Qi Jiang,&nbsp;Yao-hui Hu","doi":"10.1140/epjp/s13360-026-08529-0","DOIUrl":"10.1140/epjp/s13360-026-08529-0","url":null,"abstract":"<div><p>5,10,15,20-tetrakis(pentafluorophenyl)porphyrin (TPPF₂₀, chemical formula C₄₄H₈N₄F₂₀) demonstrates excellent photostability and oxidative stability. The substitution of nitrogen atoms in macrocycle with C, O, or S can significantly impact the synthetic feasibility and stability of the macrocyclic structure. In this study, the structures, stability, and electronic properties of transition metal (TM) embedded C₄₄H₈N₄F₂₀ and its derivatives have been systematically investigated using density functional theory. The results indicate that the S atom in TMC₄₄H₈N₃SF₂₀ deviates significantly from the central plane of the macrocycle. The overall structural stability of TMC₄₄H₈N₄F₂₀ and its derivatives follows the descending order: TMC₄₅H₈N₃F₂₀&gt; TMC₄₄H₈N₄F₂₀ &gt; TMC₄₄H₈N₃OF₂₀ &gt; TMC₄₄H₈N₃SF₂₀. Additionally, TMC₄₄H₈N₃OF₂₀ exhibits a larger dipole moment than TMC₄₄H₈N₃SF₂₀. Notably, CrC₄₄H₈N₄F₂₀ and CrC₄₄H₈N₃SF₂₀ are expected to possess outstanding electrocatalytic performance and unique catalytic selectivity. Analysis of reactive sites reveals that electrophilic regions are exclusively localized at the C-substituted position in TMC₄₅H₈N₃F₂₀. Furthermore, the Mulliken charges of the TM atoms in TMC₄₄H₈N₃SF₂₀ are slightly lower than those in TMC₄₄H₈N₄F₂₀ and other derivatives, with the exception of CuC₄₅H₈N₃F₂₀ and ZnC₄₅H₈N₃F₂₀.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 11","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338772","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}

{"title":"Investigation of decay widths of charmed hadrons","authors":"Raghavendra Kaushal,&nbsp; Bhaghyesh","doi":"10.1140/epja/s10050-026-01983-5","DOIUrl":"10.1140/epja/s10050-026-01983-5","url":null,"abstract":"<div><p>The annihilation and radiative decay widths of fully charmed hadrons are investigated using a non-relativistic phenomenological potential model. The wavefunctions and model parameters obtained by solving the non-relativistic Schrodinger equation are used to calculate the various decay widths. The annihilation decay widths of charmonium, radiative decay widths of charmonium and triply charmed baryons are evaluated. It is seen that the radiative decays of charmonium are dominated by <i>E</i>1 and <i>M</i>1 transitions, whereas for triply charmed baryons the radiative decays are dominated by <i>E</i>2 and <i>M</i>1 transitions.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"62 11","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-026-01983-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338644","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}

{"title":"Weakly interacting lump waves within the framework of the (2+1)-dimensional generalized KdV equation","authors":"Jingzhu Teng,&nbsp;Yinqiao Zhang,&nbsp;Biao Li","doi":"10.1007/s12043-026-03201-9","DOIUrl":"10.1007/s12043-026-03201-9","url":null,"abstract":"<div><p>In this paper, anomalous scattering lump solutions for the generalized Korteweg-de Vries (gKdV) equation are constructed via the Hirota bilinear form combined with an improved limiting technique. The evolutionary dynamics of the two-lump anomalous scattering are investigated, and the corresponding asymptotic behaviors are explicitly derived. Furthermore, we analyze novel weak interaction structures comprising three lumps, which form triangular patterns and possess anomalous scattering characteristics. The collision phenomena between a fundamental lump and a two-lump anomalous scattering state are also investigated. These results provide new insights into the structural and dynamical features of lump solutions.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"100 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338710","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":"Integrability, symmetries, and conservation laws of the geophysical Boussinesq model","authors":"Sherin Agnus,&nbsp;Rajeswari Seshadri","doi":"10.1007/s12043-026-03187-4","DOIUrl":"10.1007/s12043-026-03187-4","url":null,"abstract":"<div><p>This study investigates the geophysical Boussinesq (geo-Bouss) equation through two powerful analytical approaches: Lie symmetry analysis and Painlevé analysis. The integrability of the equation is investigated using the Weiss–Tabor–Carnevale (WTC) Painlevé test, which confirms that the geo-Bouss equation possesses the Painlevé property. This result facilitates the construction of a Bäcklund transformation, which is further utilized to derive the bilinear form of the equation. By applying the Hirota bilinear method, we construct explicit soliton solutions of the geo-Bouss equation. Additionally, by using the concept of nonlinear self-adjointness, we systematically derive associated conservation laws.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"100 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338757","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":"Roles of polarization and detuning in the noise-induced relaxation dynamics of atomic-molecular bose condensates","authors":"Avinaba Mukherjee,&nbsp;Raka Dasgupta","doi":"10.1140/epjp/s13360-026-08466-y","DOIUrl":"10.1140/epjp/s13360-026-08466-y","url":null,"abstract":"<div><p>We study the relaxation dynamics of a resonant Bose gas driven by Gaussian white noise. The system is characterized by the population imbalance between molecules and atoms as well as their mutual coherence. We analyze longitudinal and transverse relaxation times using mean-field theory and a Bogoliubov–Born–Green–Kirkwood–Yvon hierarchy that incorporates higher-order correlations. We find that when the initial imbalance is near the system equilibrium, that enhances the longitudinal relaxation time, as reflected by a minimum in the drift speed near equilibrium. With an increasing value of initial polarization, the transverse relaxation time is suppressed, evidenced by a reduction in the von Neumann entropy due to coherence loss. As the Feshbach detuning is varied, the longitudinal relaxation time attains a minimum near resonance, where atom–molecule conversion is maximal. In contrast, the transverse relaxation time reaches a maximum near resonance, corresponding to maximal condensate coherence.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 11","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338643","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}

{"title":"High-response ethanol gas sensor based on polyaniline/strontium ferrite nanocomposites","authors":"Kailas N. Warale,&nbsp;Avinash R. Gaikwad,&nbsp;Amol R. Pardeshi,&nbsp;Nilesh D. Sakhare,&nbsp;Vijay A. Mane,&nbsp;Ramprasad B. Sonpir,&nbsp;Shrinivas C. Latange,&nbsp;Surendra M. Yenorkar","doi":"10.1007/s00339-026-10455-y","DOIUrl":"10.1007/s00339-026-10455-y","url":null,"abstract":"<div><p>Polyaniline (PANI)/strontium ferrite (SrFe₁₂O₁₉, SFO) hybrid nanocomposite thin films were successfully fabricated by integrating chemically synthesized PANI with sol–gel-derived SFO for low-temperature ethanol gas sensing. The structural, optical, morphological, surface, and gas-sensing properties were systematically investigated to determine the influence of ferrite loading on sensing performance. X-ray diffraction confirmed the formation of crystalline hexagonal SrFe₁₂O₁₉, with composite crystallite sizes ranging from 33.38 to 37.52 nm. Optical analysis revealed that the optimized PSFO3 nanocomposite exhibited an apparent band gap of 2.20 eV, compared with 2.43 eV for pristine SFO. Brunauer–Emmett–Teller analysis demonstrated that PSFO3, containing 25 wt% PANI and 75 wt% SFO, possessed the highest specific surface area of 72.27 m²/g and pore volume of 0.0694 cm³/g. Among the investigated sensing materials, PSFO3 exhibited the highest ethanol response of approximately 95% at an operating temperature of 60 °C and an ethanol concentration of 300 ppm, outperforming pristine PANI (63%), PSFO1 (78%), PSFO2 (85%), and SFO (72%). Furthermore, the optimized sensor demonstrated rapid response and recovery times of 16 s and 17 s, respectively. The enhanced ethanol-sensing performance is attributed to the combined effects of increased accessible surface area, mesoporous characteristics, and interfacial interactions between conducting PANI and semiconducting SFO. These findings demonstrate the potential of PANI/ SrFe₁₂O₁₉ nanocomposites for efficient low-temperature ethanol detection.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"132 12","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conformal line defects from matter-coupled 5D (N=4) gauged supergravity","authors":"Parinya Karndumri","doi":"10.1140/epjc/s10052-026-16503-4","DOIUrl":"10.1140/epjc/s10052-026-16503-4","url":null,"abstract":"<div><p>We study a number of holographic solutions describing conformal line defects within <span>(N=2)</span> SCFTs from matter-coupled <span>(N=4)</span> gauged supergravity in five dimensions. For <span>(SO(2)_Dtimes SO(3))</span> gauge group, the gauged supergravity admits two supersymmetric <span>(AdS_5)</span> vacua with <span>(N=4)</span> and <span>(N=2)</span> unbroken supersymmetries. It turns out that only solutions that are asymptotic to the <span>(N=4)</span> vacuum are possible leading to line defects within the dual <span>(N=2)</span> SCFT. In gauged supergravity with <span>(SO(2)times ISO(3))</span> gauge group, we find similar solutions with the <span>(N=2)</span> SCFT appearing in the IR while the UV field theories correspond to six-dimensional <span>(N=(0,2))</span> field theories arising from M5-branes wrapped on a hyperbolic space <span>(H^2)</span>. The solution with <span>(SO(2)times SO(3))</span> symmetry is also uplifted to eleven dimensions via a consistent truncation on <span>(H^2times S^4)</span>. Finally, for gauged supergravity with <span>(SO(2)times SO(3)times SO(3))</span> gauge group that admits two <span>(N=4)</span> supersymmetric <span>(AdS_5)</span> vacua, we find a solution describing a line defect that interpolates between these two vacua as well as a solution with only one asymptotic <span>(AdS_5)</span> geometry.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 11","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16503-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Defect-mediated nonlinear optical response of multiphase engineered NiCoS2 nanocomposites for reverse saturable absorption and optical limiting applications","authors":"Ravirajsinh J. Jadav,&nbsp;Ketan D. Parikh,&nbsp;Devarshi H. Vyas,&nbsp;Vijay R. Dubey,&nbsp;J. Kawya,&nbsp;T. C. Sabari Girisun","doi":"10.1007/s00339-026-10440-5","DOIUrl":"10.1007/s00339-026-10440-5","url":null,"abstract":"<div><p>In this work, multiphase engineering was used to tailor the electronic and nonlinear optical (NLO) characteristics of NiCoS₂ (NCO) nanocomposites through the formation of defect-rich heterointerfaces and localized electronic states. Presented multiphase engineered NCO nanocomposites were synthesized by a solvothermal method and characterized their structural, morphological, optical, and NLO properties. Raman spectroscopy confirmed coexistence of cubic-Co₃S₄, hexagonal-CoS, cubic-Ni₃S₄ and hexagonal-NiS phase architecture. While field-emission scanning electron microscopy (FESEM) has revealed a predominantly spherical morphology, and elemental mapping showed a relatively homogeneous distribution of Ni, Co, and S in NCO nanocomposites. The UV–visible absorption spectrum exhibited strong absorption in the visible range and from which, an optical bandgap was estimated to be 1.6 eV, and an Urbach energy was observed to be 0.3 eV. The photoluminescence (PL) characteristics indicated the involvement of defect-related carrier trapping and reduced radiative recombination pathways, which was contributed to the retention of photoexcited carriers. Furthermore, the nonlinear optical (NLO) properties were investigated using open-aperture Z-scan response, which shown pronounced reverse saturable absorption with yielded a two-photon absorption coefficient around 1.60 × 10^− 10 m/W due to the combined effects of interfacial charge transfer, defect-mediated excited-state absorption, and sequential excitation involving localized electronic states. In addition, the optical limiting threshold was observed to be 2.42 × 10¹² W/m² for the NCO nanocomposites, demonstrating attenuation of transmitted laser intensity under high-intensity irradiation. These findings is establishing the NCO nanocomposites as desirable candidates for advance laser-protection application.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"132 12","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spray-time-dependent deposition of laser-ablated silver nanoparticles on porous silicon enhancing selective green-to-yellow optical response","authors":"Nasih Hma Salah,&nbsp;Mohammed Idrees Omer","doi":"10.1140/epjp/s13360-026-08493-9","DOIUrl":"10.1140/epjp/s13360-026-08493-9","url":null,"abstract":"<div><p>Engineering and developing cost-effective, wavelength-selective photodetectors (PDs) with high responsivity and long-term stability remains a critical challenge in optoelectronics. In this work, we presented a scalable strategy for engineering porous silicon (PS) PDs functionalized with femtosecond-laser-ablated silver nanoparticles (Ag-NPs) using a spray-time-controlled deposition approach. Ag-NPs exhibited strong colloidal stability with a negative surface charge of − 35 mV by zeta potential, and deposited onto PS using optimized spray durations of 250 s (PS- Ag₁-NPs) and 350 s (PS- Ag₂-NPs). FESEM analysis revealed that Ag incorporation induced a clear size-dependent evolution (13.97 nm for PS- Ag₁-NPs and 19.83 nm for PS- Ag₂-NPs) and increased PS layer thickness from 2.27 to 2.65 µm and 2.78 µm, respectively. XRD and FTIR confirmed SiO₂ and AgO formation, with intensities rising with Ag content. Graphite electrodes provided stable ohmic contacts, with thermal annealing at 130 °C for 30 min further improving adhesion and stability. Voltage-dependent I-V characteristics were recorded from 0–5.2 V for all devices, followed by wavelength-resolved photocurrent measurements across the UV-Red spectrum at 2.8, 4.0, and 5.2 V. Ag functionalization substantially reconfigured the spectral response: Under 5.2 V bias, PS- Ag₁-NPs PD exhibited a peak response in the green region (530 nm, 1.7 mW/cm²), achieved a sensitivity of 310.07% and a responsivity of 0.484 A/W, meanwhile, the PS- Ag₂-NPs PD reached its maximum response in the yellow region (575 nm, 2.1 mW/cm²), with 332.40% sensitivity and 0.566 A/W responsivity, outperforming unmodified PS PD (264.62%, 0.106 A/W). Devices demonstrated excellent repeatability (&lt; 9.78% variation) and retained over 91% sensitivity after 60 days. This work demonstrated that spray-time-controlled Ag-NP engineering enabled high-responsivity and long-lived PDs with wavelength-selective performance suitable for advanced optoelectronic applications.</p><h3>Graphical abstract</h3>\u0000<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 11","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338442","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}

{"title":"Signatures of Lorentz violation in the bright ring for Sgr A* images from radiatively inefficient accretion flows","authors":"Cuiyu Zhao,&nbsp;Songbai Chen,&nbsp;Jiliang Jing","doi":"10.1140/epjc/s10052-026-16583-2","DOIUrl":"10.1140/epjc/s10052-026-16583-2","url":null,"abstract":"<div><p>We have investigated the effects of Lorentz violation (LV) on the bright ring in Sgr A* images illuminated by the 230 GHz thermal synchrotron emission from radiatively inefficient accretion flows around a rotating LV black hole within the low-energy Hořava gravity framework. Our results reveal that the LV parameter reduces the bright ring diameter yet increases its width, luminosity, azimuthal asymmetry and orientation angle. A higher spin parameter strengthens the LV-induced effects on the bright ring properties. Increasing disk thickness reduces the ring diameter and enhances the LV parameter’s effects on this diameter. The ring width shows no systematic dependence on the disk thickness. These quantities of the bright ring display similar trends against the black hole spin and the LV parameter for the rotating LV black hole. Using EHT observational data of Sgr A*, we find that, at fixed disk thickness, the parameter-space map illustrates that the bounded range of the LV parameter first broadens and then contracts with the growing black hole spin, and shifts toward smaller LV parameter values. In addition, the LV parameter narrows the bounded range of black hole spin: negative LV parameter values shift this range to a higher spin, while positive values shift it to a lower spin. Finally, we probe effects of the LV parameter on the peak position value and the width of the primary image and the <span>(n=1)</span> photon ring for the rotating LV black hole. The peak positions and their widths nearly always decrease with the LV parameter. The peak position differences for various LV parameters are more pronounced for a purely Keplerian accretion flow. In addition, the primary image and the <span>(n=1)</span> photon ring produced by purely radially free-falling flows are broader than their counterparts generated by purely Keplerian flows.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 11","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16583-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}