Physics Open最新文献

{"title":"Laser assist quantum dot scattering with Gaussian potential","authors":"Rajendra Prasad Kurmi ,&nbsp;Kishori Yadav ,&nbsp;Anil Shrestha ,&nbsp;Saddam Husain Dhobi","doi":"10.1016/j.physo.2025.100267","DOIUrl":"10.1016/j.physo.2025.100267","url":null,"abstract":"<div><div>Laser-assisted quantum dot (QD) scattering with a Gaussian potential explores the interaction of QDs with incident laser fields, influencing their scattering dynamics with several parameters. It has wide applications in quantum computing, nanophotonics, optoelectronics, precise quantum state manipulation, biosensing, medical imaging, and photovoltaics, where laser control enhances QD performance for improved efficiency and sensitivity. This study investigates the differential cross-section (DCS) in laser field with QD (dressed gaussian potential) and field free electron. This is theoretical work, to developed new model of DCS for considered system, Kroll-Watson approximation, Volko wave functions and S-matrix and T-matrix are used as theoretical tools. After the development of model different parameters are used like incidence energies (0 to 5 eV), scattering angles (0 to 60°), QDsizes (0 to 10 Å), and laser-dressed parameters (0 to 40 Å) to study the nature of DCS, for validation of parameter's authors used secondary data from published work. The nature of developed equation was computed using MATLAB online student package. The observation shows that the DCS decrease with increasing in incident energy of electron and scattering angle while increase with QDs size as well as laser-dressed parameters. Also, the observation shows DCS for zero-order Bessel function is higher DCS than other higher order Bessel function. Additionally, the observation also shows DCS for elliptical polarization found higher than linear polarization. This shows DCS is effects by different parameters as well as assumption consider in this study. This means the system also goes effect when such QD is used in applied field as mention above. So, it is necessary to study the DCS of QD under various condition.</div></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"23 ","pages":"Article 100267"},"PeriodicalIF":0.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical audio cryptosystem using hyperchaotic implementation in Gyrator domain","authors":"Miao Tian ,&nbsp;Yuanyue Cui ,&nbsp;Zhengjun Liu ,&nbsp;Hang Chen","doi":"10.1016/j.physo.2025.100264","DOIUrl":"10.1016/j.physo.2025.100264","url":null,"abstract":"<div><div>Some reported audio encryption methods are inefficient, their anti-differential attack capabilities are subpar, and using a pseudo-random number generator in a singular chaotic system results in diminished security, gradually revealing additional issues. This paper proposes a novel optical audio cryptosystem based on the Gyrator (GT) transform and a hyperchaotic system. The proposed algorithm involves merging chaos theory with conventional cryptographic techniques to create an optical encryption algorithm that aligns better with the properties of digital audio. To enhance security, the hyperchaotic system generates various hyperchaotic states involved in the disruption process. Subsequently, Random Mode Decomposition (RMD) is employed to generate two asymmetric independent vectors, leading to the acquisition of the ciphertext and private key. During the decryption phase, the ciphertext and private key are transferred into the input plane of the GT transform. Indeed, the suggested cryptographic system is apt for authenticating messages, as hyperchaotic data is essential for encryption and decryption techniques. A series of attack experiments have demonstrated the efficacy and capability of the cryptosystem.</div></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"23 ","pages":"Article 100264"},"PeriodicalIF":0.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unitary and entangling solutions to the parametric Yang–Baxter equation in all dimensions","authors":"Arash Pourkia","doi":"10.1016/j.physo.2025.100263","DOIUrl":"10.1016/j.physo.2025.100263","url":null,"abstract":"&lt;div&gt;&lt;div&gt;We present a new class of solutions to the parameter-dependent Yang–Baxter equation across all dimensions, which includes a significant subclass of unitary and entangling solutions. In any dimension &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;mo&gt;≥&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, we construct a well-structured matrix &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; that exhibits intriguing and useful symmetries. A key feature of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; is its composition from four &lt;em&gt;monomial-based&lt;/em&gt; layers: &lt;span&gt;&lt;span&gt;&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;b&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;y&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;where &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;b&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;y&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; are four sets of monomial complex functions of the form, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;b&lt;/mi&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;b&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;y&lt;/mi&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;y&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, respectively. This well-designed structure plays a crucial role in demonstrating that &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; is indeed a solution to the Yang–Baxter equation and in establishing the conditions for its unitarity and entangling properties. Additionally, it allows us to identify interesting non-trivial subfamilies with these properties.&lt;/div&gt;&lt;div&gt;As is widely recognized, unitary and entangling solutions to the Yang–Baxter equation serve as universal quantum logic gates for qudit quantum computing. Moreover, the search for new solutions to the Yang–Baxter equation in higher dimensions is a common endeavor in both mathematics and physics.&lt;/d","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"23 ","pages":"Article 100263"},"PeriodicalIF":0.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Proceedings of the Erice workshop: A new baseline for the hybrid, asymmetric, linear Higgs factory HALHF","authors":"Brian Foster ,&nbsp;Erik Adli ,&nbsp;Timothy L. Barklow ,&nbsp;Mikael Berggren ,&nbsp;Stewart Boogert ,&nbsp;Jian Bin Ben Chen ,&nbsp;Richard D’Arcy ,&nbsp;Pierre Drobniak ,&nbsp;Sinead Farrington ,&nbsp;Spencer Gessner ,&nbsp;Mark J. Hogan ,&nbsp;Daniel Kalvik ,&nbsp;Antoine Laudrain ,&nbsp;Carl A. Lindstrøm ,&nbsp;Benno List ,&nbsp;Jenny List ,&nbsp;Xueying Lu ,&nbsp;Gudrid Moortgat Pick ,&nbsp;Kristjan Põder ,&nbsp;Andrei Seryi ,&nbsp;Jonathan Wood","doi":"10.1016/j.physo.2025.100261","DOIUrl":"10.1016/j.physo.2025.100261","url":null,"abstract":"<div><div>The HALHF collaboration has discussed a new baseline for the project, taking into account comments from the accelerator community on various aspects of the original design. In particular, these concerned the practicality of the dual-purpose linac to accelerate both colliding positron bunches and the drive beams required for the plasma linac. In addition, many other aspects of the project were also considered; the discussion and conclusions are documented in this paper. Finally, a new baseline is outlined that has been optimised and addresses several weaknesses in the original design, has higher luminosity, reduced centre-of-mass energy boost and additional features such as two interaction points and positron polarisation as well as electron polarisation. Although HALHF has become longer and more expensive, it remains significantly smaller and cheaper than other mature Higgs factory designs currently under discussion.</div></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"23 ","pages":"Article 100261"},"PeriodicalIF":0.0,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143679449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A real-valued description of quantum mechanics with Schrödinger's 4th-order matter-wave equation","authors":"Nicos Makris ,&nbsp;Gary F. Dargush","doi":"10.1016/j.physo.2025.100262","DOIUrl":"10.1016/j.physo.2025.100262","url":null,"abstract":"<div><div>Using a variational formulation, we show that Schrödinger's 4th-order, real-valued matter-wave equation which involves the spatial derivatives of the potential <span><math><mrow><mi>V</mi><mrow><mo>(</mo><mi>r</mi><mo>)</mo></mrow></mrow></math></span>, produces the precise eigenvalues of Schrödinger's 2nd-order, complex-valued matter-wave equation together with an equal number of negative, mirror eigenvalues. The variational forms of the matter-wave equations are computed numerically with a Ritz-spline method and we show how this method handles accurately discontinuous potentials with singular derivatives. Accordingly, the paper concludes that there is a real-valued description of non-relativistic quantum mechanics in association with the existence of negative, mirror energy levels. Schrödinger's classical 2nd-order, complex-valued matter-wave equation which was constructed upon factoring the 4th-order, real-valued differential operator and retaining only one of the two conjugate complex operators is a simpler description of the matter-wave, since it does not involve the derivatives of the potential <span><math><mrow><mi>V</mi><mrow><mo>(</mo><mi>r</mi><mo>)</mo></mrow></mrow></math></span>, at the expense of missing the negative, mirror energy levels.</div></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"23 ","pages":"Article 100262"},"PeriodicalIF":0.0,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143815006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cartan quantum metrology","authors":"Gabriele Fazio ,&nbsp;Jiayu He ,&nbsp;Matteo G.A. Paris","doi":"10.1016/j.physo.2025.100260","DOIUrl":"10.1016/j.physo.2025.100260","url":null,"abstract":"<div><div>We address the characterization of two-qubit gates, focusing on bounds to precision in the joint estimation of the three parameters that define their Cartan decomposition. We derive the optimal probe states that jointly maximize precision, minimize sloppiness, and eliminate quantum incompatibility. Additionally, we analyze the properties of the set of optimal probes and evaluate their robustness against noise.</div></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"23 ","pages":"Article 100260"},"PeriodicalIF":0.0,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unifying physics theories with a single postulate","authors":"F. Salmon","doi":"10.1016/j.physo.2025.100258","DOIUrl":"10.1016/j.physo.2025.100258","url":null,"abstract":"<div><div>Humans have developed mathematical theories to explain observed physical phenomena in nature. However, the links between these theories are not fully understood in 2024. Apparent incompatibilities between quantum mechanics and relativity, for instance, still exist. This paper proposes a comprehensive theory of the universe that includes gravitation, quantum mechanics, electromagnetism, special relativity, and general relativity. All of these theories are derived from the single postulate that the universe is a four-dimensional ball undergoing accelerating inflation, the surface of which is our three-dimensional world.</div></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"23 ","pages":"Article 100258"},"PeriodicalIF":0.0,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Excellent self-assembly properties of Iron Phthalocyanines on alumina for locally ordered single-atom catalysts","authors":"Fatema Mohamed ,&nbsp;Manuel Corva ,&nbsp;Erika Tomsič ,&nbsp;Zhijing Feng ,&nbsp;Tomáš Skála ,&nbsp;Giovanni Comelli ,&nbsp;Nicola Seriani ,&nbsp;Erik Vesselli ,&nbsp;Maria Peressi","doi":"10.1016/j.physo.2025.100259","DOIUrl":"10.1016/j.physo.2025.100259","url":null,"abstract":"<div><div>In a biomimetic approach, metal Phthalocyanines (Pcs) can be considered to efficiently model single atom catalysts (SACs), hosting catalytically active single metal atoms in their macrocyclic cages. An ordered 2D array of SACs can thus be obtained when metal Pcs are assembled in a regular framework. In this work we consider in particular Iron Pcs (FePcs) on an ultra-thin alumina film grown on the Ni₃Al(111) surface. Intrinsic modulations in the potential energy surface related with the oxide film structure drive the self-assembly of FePc molecules into a regular array, with molecular vacancies forming a hexagonal Bravais lattice with the same periodicity of the substrate, i.e. with a lattice parameter of about 4 nm. The symmetry of the supramolecular structure is dictated by the template rather than by the C_4v symmetry of the individual molecules, thus indicating prevalence of molecule-substrate interactions with respect to intermolecular forces. The same hexagonal periodicity extends also to the multilayer, which starts forming already before completion of the first, interfacial monolayer. The latter exhibits a local definite chirality, also propagating to the multilayer in a determined stacking sequence.</div></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"23 ","pages":"Article 100259"},"PeriodicalIF":0.0,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spectroscopic approach to understanding complex impedance in sodium silicate","authors":"Md Ayub Sheikh ,&nbsp;Sudhangshu Chakraborty","doi":"10.1016/j.physo.2025.100255","DOIUrl":"10.1016/j.physo.2025.100255","url":null,"abstract":"<div><div>This study investigates the complex impedance spectroscopy (CIS) of sodium silicate (Na₂SiO₃) across various frequencies and temperatures to examine the influence of grain and grain boundary polarization on its electrical properties. The findings reveal a non-Debye relaxation behavior, deviating from ideal relaxation models typically observed in such materials. Both dielectric relaxation and dispersion effects contribute to the polaron-controlled hopping mechanism evident in the CIS data.The Nyquist plot exhibits a single semicircular arc, indicating that grain boundary polarization is the dominant factor affecting the impedance of sodium silicate. Additionally, the study explores the correlated barrier-hopping model, providing insights into AC conductivity behavior across different frequency ranges. This comprehensive analysis enhances the understanding of sodium silicate's electrical properties, which is crucial for potential applications in materials science, particularly in contexts where polarization effects and conductivity mechanisms play a key role. Beyond fundamental insights, the research offers practical implications for optimizing material performance in related fields.</div></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"23 ","pages":"Article 100255"},"PeriodicalIF":0.0,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of annealing on the structural, morphological, optical, magnetic, and dielectric properties of nickel-doped cobalt nanoferrites for electronic applications","authors":"Md Shihabun Sakib ,&nbsp;Md Naimur Rahman ,&nbsp;Md Alamgir Hossain ,&nbsp;Md Rashedur Rahman","doi":"10.1016/j.physo.2024.100250","DOIUrl":"10.1016/j.physo.2024.100250","url":null,"abstract":"<div><div>Nanocrystalline powders of nickel-substituted cobalt ferrite were synthesized using the chemical co-precipitation method with ammonia solution as the precipitating agent, maintaining a nickel-to-iron mole ratio of 1:3. The effects of annealing at 600 °C, 650 °C, 700 °C, and 750 °C on the structural, morphological, optical, magnetic, and dielectric properties of the samples were evaluated using X-ray diffraction (XRD), scanning electron microscopy (SEM), a UV–vis–NIR spectrophotometer (UV), a vibrating sample magnetometer (VSM), and an impedance analyzer. X-ray diffraction analysis confirmed the f.c.c spinel structure with an Fd<em>3</em>m symmetric space group, and crystallite sizes increased from 15.96 to 19.11 nm with higher annealing temperatures. SEM revealed nanoparticle sizes of 362.14–444.88 nm, each comprising 22–23 crystals. UV spectroscopy indicated semiconductor behavior with band gaps ranging from 1.86 to 2.15 eV. Dielectric constant and losses decreased with higher annealing temperature and frequency. Annealing affected interionic bond lengths, distances, and angles, resulting in an increase in coercivity from 77.15 to 117.70 Oe, while saturation magnetization decreased from 9.15 to 5.32 emu/g, indicating the soft magnetic properties of CNSF nanoparticles. The Curie temperature dropped from 551.29 °C to 379.55 °C as temperature increased. The experimental results align with reported values, showing that higher annealing temperatures provide optimal structural, morphological, and magnetic properties, while lower temperatures favor optical and dielectric properties in CNSF nanoparticles.</div></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"22 ","pages":"Article 100250"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}