Results in Physics最新文献

{"title":"Fractal checkerboard zone plates","authors":"Adrián Garmendía-Martínez ,&nbsp;Arlen B. Pérez-Hernández ,&nbsp;Walter D. Furlan ,&nbsp;Vicente Ferrando ,&nbsp;Juan A. Monsoriu ,&nbsp;Francisco M. Muñoz-Pérez","doi":"10.1016/j.rinp.2025.108559","DOIUrl":"10.1016/j.rinp.2025.108559","url":null,"abstract":"<div><div>In this work, we introduce a novel diffractive optical element, the Fractal Checkerboard Zone Plate (FCZP). It is based on a two-dimensional binary matrix generated through iterative substitution rules that produce self-similar fractal geometries. Starting from a seed matrix, higher-order structures are constructed iteratively, defining the transmittance pattern of the lens with transparent and opaque rectangular regions. The axial irradiance distributions of FCZPs of various orders are analyzed and compared to those of equivalent periodic checkerboard zone plates (PCZPs). Although both exhibit a primary focal distance at the same position, FCZPs display intensity profiles with self-similar characteristics typical of diffractive fractal structures. Moreover, compared to other square fractal lenses, FCZPs offer higher relative diffraction efficiency.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"80 ","pages":"Article 108559"},"PeriodicalIF":4.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145787121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Tuning the properties of armchair graphene nanoribbons via chromium doping and double vacancy engineering","authors":"Huda Yahya Maky ,&nbsp;Gholamreza Karimi ,&nbsp;Fouad N. Ajeel","doi":"10.1016/j.rinp.2025.108555","DOIUrl":"10.1016/j.rinp.2025.108555","url":null,"abstract":"<div><div>The thermoelectric properties of armchair graphene nanoribbons (AGNRs) have garnered significant interest due to their promising potential in energy conversion applications. However, achieving a balance between electrical conductance and thermal conductance remains a major challenge. In this study, we investigate the effects of double vacancy (DV) defects and chromium (Cr) doping on the thermoelectric performance of AGNRs using Extended Hückel theory (EHT) combined with nonequilibrium Green’s function (NEGF) formalism. Our results display that the introduction of DV defects reduces the bandgap of AGNRs, enhancing the carrier transport and creating thermally accessible electronic states. However, the most notable improvement occurs with Cr doping. Chromium atoms, introduced at various lattice sites within DV-defected AGNRs, significantly reduce the bandgap further, introduce mid-gap states, and increase electrical conductance. The interplay between Cr dopants and DV defects leads to a significant enhancement in Seebeck coefficient and a reduction in thermal conductance, resulting in improved thermoelectric performance. Specifically, a four-Cr atom configuration yields the highest thermoelectric figure of merit <span><math><mrow><mi>ZT</mi></mrow></math></span>, reaching a value of 1.93 at room temperature. This performance is driven by the combined effects of reduced the thermal conductance, high electrical conductance, and a moderately enhanced Seebeck coefficient. Additionally, the study emphasizes the importance of dopant site engineering, as Cr placement at specific lattice sites maximizes the thermoelectric efficiency by enhancing carrier delocalization without introducing excessive metallic behavior. These findings suggest that the co-engineering of defects and dopants, particularly Cr doping, offers a promising strategy for enhancing the thermoelectric performance of AGNRs. This study paves the way for future design strategies in the development of high-performance, low-power thermoelectric materials for nanoscale energy harvesting applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"80 ","pages":"Article 108555"},"PeriodicalIF":4.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145787123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Effect of Phytochemical-Mediated synthesis using Allium sativum, Zingiber officinale, and Carica papaya extracts on the Inductive heating characteristics of MnFe2O4 nanoparticles","authors":"G. Nandhini,&nbsp;M.K. Shobana","doi":"10.1016/j.rinp.2025.108546","DOIUrl":"10.1016/j.rinp.2025.108546","url":null,"abstract":"<div><div>The synergistic exploration of magnetic nanoparticles and bioactive plant extracts has yielded a groundbreaking cancer therapeutic modality, capitalizing on the potential of nanotechnology and phytochemistry to target and ablate malignant cells. This comprehensive investigation elucidates the impact of various plant extracts on the structural, magnetic, hyperthermic, and cytotoxic properties of MnFe₂O₄ nanoparticles. The structural analysis of the nanoparticles functionalized with plant extracts reveals the formation of a single-phase spinel structure and exhibits a spherical morphology. FTIR analysis confirms the incorporation of bioactive compounds by identifying specific functional groups that contribute to the stabilization and functionalization of the nanoparticles. The microscopic and macroscopic investigation of magnetic properties exhibits a high saturation magnetization of 47 emu/g, accompanied by an inherently low coercivity (∼14 Oe) and a relatively short transverse relaxation time of 3.18*10^-11 s. Below the biological threshold, <em>Zingiber officinale</em> extract with MnFe₂O₄ nanoparticles exhibits a high specific absorption rate of 329 W/g under an applied magnetic field. The cytotoxicity analysis of <em>Allium sativum</em> extract revealed a good selectivity index of 2.3 with a 37 μg/ml IC₅₀ value, illustrating anti-proliferation activity against A-549 cells. These findings highlight the importance of phytochemical functionalization in MnFe₂O₄ nanoparticle performance for magnetic hyperthermia applications, with potential implications for cancer treatment.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"80 ","pages":"Article 108546"},"PeriodicalIF":4.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Annealing effect on physical properties and antibacterial performance in green-Turmeric co-precipitated silver-cobalt-ferrite nanoparticles utilizing fine-sediments as iron-cations source-materials","authors":"Riyatun ,&nbsp;Adiana Musadewi ,&nbsp;Utari ,&nbsp;Nurdiyantoro Putra Prasetya ,&nbsp;ST.Ulfawanti Intan Subadra ,&nbsp;Nandang Mufti ,&nbsp;Markus Diantoro ,&nbsp;Munasir ,&nbsp;Ahmad Taufiq ,&nbsp;Budi Purnama","doi":"10.1016/j.rinp.2025.108572","DOIUrl":"10.1016/j.rinp.2025.108572","url":null,"abstract":"<div><div>The silver-substituted cobalt ferrite nanoparticles (AgCFO-NPs) have been successfully synthesized using green-coprecipitated method with turmeric (<em>Curcuma Longa Linn</em>) extract with utilizing a fine-sediment iron-sand as Fe³⁺ ions source. XRD results show the spectral data is in accordance with ICDD No. 22–1086, thus confirming that the cobalt ferrite nanocrystal phase is present. Crystallite size calculation increase <em>D</em> = 22.00 nm to 31.45 nm with an increasing annealing temperature (<em>T</em>_a = 100 °C to 500 °C). Characteristic FTIR curve show adsorption-peak band around <em>v</em>₁ = ∼569.99 cm⁻¹ and <em>v</em>₂ = ∼399.28 cm⁻¹ indicate to the intrinsic vibration of metal–oxygen bonds at the tetrahedral and octahedral sites of the spinel structure. Furthermore, temperature of annealing <em>T</em>_a tunes the magnetic properties of the AgCFO-NPs_. SEM result show that the green synthesis realizes nanoparticles wrapped into large granules (<em>T</em>_a = 100 °C and 200 °C) and then the granular wrapping gradually disappears with the increase of the <em>T</em>_a (300 °C, 400 °C and 500 °C). Finally, antibacterial performance (for <em>Staphylococcus aureus</em> and <em>Escherichia coli</em>) show that the highest zone-inhibition of 16.70 mm (at 300 °C) in <em>S. aureus</em> and 14.88 mm (at 200 °C) in <em>E. coli</em> are observed, respectively. Here, nanoparticles utilizing fine-sediment iron-sand are promising as an effective and biocompatible antibacterial agent in next-future medical application.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"80 ","pages":"Article 108572"},"PeriodicalIF":4.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145924867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 for predicting heat and mass transfer in Maxwell–Sutterby fluid flow over a Riga plate geometry via Levenberg–Marquardt backpropagation neural network algorithm: influence of joule heating and activation energy","authors":"Gunisetty Ramasekhar ,&nbsp;Muhammad Jawad ,&nbsp;Shaik Jakeer ,&nbsp;Seethi Reddy Reddisekhar Reddy ,&nbsp;Walid Abdelfattah ,&nbsp;Hakim AL Garalleh ,&nbsp;Sarfaraz Kamangar","doi":"10.1016/j.rinp.2025.108528","DOIUrl":"10.1016/j.rinp.2025.108528","url":null,"abstract":"<div><div>Activation energy is vital in chemical kinetics, influencing reaction rates and aiding in understanding and optimizing various industrial processes. This research aims to investigate the significance of activation energy on magnetized flow of Maxwell–Sutterby fluid bounded by Riga plate in the presence of motile microbes. For the inspiration of problem, the influence of variable thermal conductivity along with Nield boundary conditions are deliberated with ANNs modelling. The theory of heat transfer<!--> <!-->with joule heating and thermal radiation is measured. The governing PDEs of Maxwell–Sutterby fluid is transformed into nonlinear ODEs via similarity platform. The couple of obtained ODEs is solved via bvp5c in MATLAB then ANN is applied with Levenberg Marquardt training approach to them. The back propagation neural network is used to forecast the intended results. Graphical and tabulated outcomes are carryout for involved profiles such that fluids velocity <span><math><mrow><mi>f</mi><mo>′</mo></mrow></math></span>, temperature <span><math><mi>θ</mi></math></span>, concentration <span><math><mi>ϕ</mi></math></span> and microbes <span><math><mi>χ</mi></math></span> over prominent parameters of interests. Further the graphs of physical quantities are also plotted. It is noticed that the skin friction factor <span><math><msub><mi>C</mi><mi>f</mi></msub></math></span> falls as the Hartmann number <span><math><mi>H</mi></math></span> rises, indicating a decline in surface shear stress. Conversely, the Nusselt number <span><math><mrow><mi>Nu</mi></mrow></math></span> boosts for developed values of <span><math><mi>H</mi></math></span>, indicating improved heat transfer at the surface. Furthermore, a rise in the thermophoresis parameter <span><math><mrow><mi>Nt</mi></mrow></math></span> improves the volumetric concentration distribution.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"80 ","pages":"Article 108528"},"PeriodicalIF":4.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145924864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"One-frame interferometric surface contouring via stepwise phase extraction and deep learning","authors":"Jurim Jeon ,&nbsp;Yangjin Kim ,&nbsp;Yusuke Ito ,&nbsp;Naohiko Sugita ,&nbsp;Mamoru Mitsuishi","doi":"10.1016/j.rinp.2025.108560","DOIUrl":"10.1016/j.rinp.2025.108560","url":null,"abstract":"<div><div>Precise inspection of interferometric optical flats is essential as the performance of the final applications directly depends on the surface characteristics. We propose a novel deep learning-based one-frame phase extraction framework for precise surface contouring of optical flats in optical interferometry. By integrating the strengths of spatial and temporal methods, the framework effectively addresses harmonic distortion, phase-shift errors, and sign ambiguity using only one experimental interferogram. Interferogram generation and phase extraction are executed sequentially using simulation datasets and trained models. Experimental validation on an optical flat demonstrates superior accuracy and robustness compared with conventional multi-frame methods. This approach significantly reduces experimental limitations while enhancing scalability in intelligent high-precision interferometric measurements.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"80 ","pages":"Article 108560"},"PeriodicalIF":4.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145787120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Systematic optimization of Cs-Sb-O activated NEA GaAs photocathodes for long-lived accelerator electron sources","authors":"Lei Guo ,&nbsp;Yoshifumi Takashima ,&nbsp;Masao Kuriki ,&nbsp;Masahiro Yamamoto","doi":"10.1016/j.rinp.2025.108552","DOIUrl":"10.1016/j.rinp.2025.108552","url":null,"abstract":"<div><div>Negative Electron Affinity (NEA)-activated GaAs-based superlattice photocathodes remain the only source capable of generating spin-polarized electron beams with polarization exceeding 90%, making them indispensable for applications such as particle accelerators and spin-resolved spectroscopy. However, conventional Cs-O activation suffers from chemical instability, resulting in rapid degradation of quantum efficiency (QE) due to gas adsorption and ion back bombardment (IBB). To maintain high performance, operation under ultra-high vacuum conditions (&lt;10⁻⁹ Pa) is required; however, the photocathode’s lifetime remains short. In our system, for example, multialkali photocathodes (e.g., K₂CsSb) typically exhibit an operational lifetime of approximately 4000 h, while NEA-GaAs photocathodes degrade significantly faster, with a lifetime of only about 20 h. To overcome these limitations, NEA activation using heterojunctions with alkali metals and antimony (Sb) or tellurium (Te) has been proposed. In particular, a Cs-Sb-O activation scheme shows promise in improving both QE and lifetime. In this study, we systematically investigate the effects of substrate temperature, Sb thickness, and timing of Sb deposition on performance. We find that a 0.5 nm Sb layer yields a QE of approximately 2% at 780 nm-comparable to Cs-O activation-while extending the dark lifetime by a factor of 10. These results demonstrate the viability of the Cs-Sb-O scheme for stable, long-lived spin-polarized electron sources. These findings provide practical guidelines for the development of robust electron sources in accelerators.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"80 ","pages":"Article 108552"},"PeriodicalIF":4.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Corrigendum to “Systematic optimization of Cs-Sb-O activated NEA GaAs photocathodes for long-lived accelerator electron sources”. [Results Phys. 80 (2026) 108552]","authors":"Lei Guo ,&nbsp;Yoshifumi Takashima ,&nbsp;Masao Kuriki ,&nbsp;Masahiro Yamamoto","doi":"10.1016/j.rinp.2025.108568","DOIUrl":"10.1016/j.rinp.2025.108568","url":null,"abstract":"","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"80 ","pages":"Article 108568"},"PeriodicalIF":4.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145924971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Enhanced superconductivity and Spin-Orbit interaction in Bi2Se3-Doped FeSe1-xTex bulk single crystals","authors":"Ankush Saxena ,&nbsp;Shiu-Ming Huang ,&nbsp;Saurabh Saini ,&nbsp;Chitimireddy Prashant ,&nbsp;Chang-Yi Ou ,&nbsp;Pin-Cing Wang ,&nbsp;I-Yu Huang ,&nbsp;Sanyam Jain ,&nbsp;Rajiv Singh ,&nbsp;Mitch Chou","doi":"10.1016/j.rinp.2025.108553","DOIUrl":"10.1016/j.rinp.2025.108553","url":null,"abstract":"<div><div>We investigated the structural, superconducting, magneto-transport, and ultrafast optical properties of Bi₂Se₃-doped FeSe_1-xTe_x single crystals containing 1 % (F37B1) and 4 % (F37B4) Bi₂Se₃. X-ray diffraction confirmed high crystallinity with c-axis-preferred orientation. The superconducting transition temperature increased from ∼ 10 K in F37B1 to ∼ 14 K in F37B4. Magneto-transport measurements revealed characteristic weak-antilocalization behavior and a clear violation of Kohler’s rule, consistent with enhanced spin–orbit scattering and multiband charge transport. X-ray photoelectron spectroscopy verified the chemical stability of Bi incorporation without secondary phases or oxidation. Magnetic hysteresis loops confirmed the presence of robust type-II superconductivity in both samples. Ultrafast optical spectroscopy revealed doping-dependent carrier relaxation: F37B1 showed faster decay components, while F37B4 exhibited slower recombination dynamics. These findings demonstrate that Bi₂Se₃ incorporation systematically modifies the electronic scattering environment in FeSe_1-xTe_x. It also strengthens spin–orbit interactions. Together, these effects provide important insight into how dopants can tune the superconducting and dynamical properties of iron chalcogenides.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"80 ","pages":"Article 108553"},"PeriodicalIF":4.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145787116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Tunable optoelectronic properties of C3N monolayers via correlation, strain, and doping","authors":"Soleimani Maryam,&nbsp;Astinchap Bander,&nbsp;Abdi Mona,&nbsp;Alemipour Zahra","doi":"10.1016/j.rinp.2025.108547","DOIUrl":"10.1016/j.rinp.2025.108547","url":null,"abstract":"<div><div>Two-dimensional (2D) materials with engineered electronic correlations are emerging as versatile platforms for next-generation optoelectronics. Here we present a comprehensive theoretical investigation of the electronic and optical properties of a C₃N monolayer using a tight-binding framework combined with the Hubbard Hamiltonian and Green’s function formalism. We show that electron–electron interactions, mechanical strain, and carrier doping act as powerful tuning parameters that reshape the optical response. Coulomb correlations drive notable modifications in the density of states (DOS), giving rise to semi-metallic behavior under specific regimes. Optical conductivity calculations reveal a prominent absorption feature near 4 eV, which undergoes systematic blue shifts and intensity modulation upon electron doping, reflecting Fermi-level–controlled interband transitions. External strain further tailors both the spectral position and strength of optical excitations, establishing strain engineering as an effective control knob. Transmission and reflectivity spectra indicate broadband opacity of C₃N, underscoring its potential for reflective coatings and nanoscale energy-control applications. Our results provide fundamental insights into the interplay of correlations, strain, and doping in 2D C₃N, and establish design principles for tailoring its optoelectronic functionality in advanced device technologies.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"80 ","pages":"Article 108547"},"PeriodicalIF":4.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}