The European Physical Journal Plus最新文献

{"title":"Influence of impurity, thickness and bulk LO phonon on decoherence and Gaussian entropy of two-level system in a disk-shaped quantum dot under electric field","authors":"Wei Xin,&nbsp;Du Su,&nbsp; Eerdunchaolu","doi":"10.1140/epjp/s13360-025-06156-9","DOIUrl":"10.1140/epjp/s13360-025-06156-9","url":null,"abstract":"<div><p>Using Pekar-type variational method, a qubit is constructed in a disk-shaped quantum dot (QD) by confined asymmetric Gaussian potential under electric field. The spontaneous emission rate of the bulk longitudinal optical (LO) phonons is studied based on the Lee-Low-Pines transformation and the Fermi golden rule, and then the qubit decoherence time and Gaussian entropy are discussed. The influence of the thickness of QD on Gaussian entropy is revealed for the first time. The numerical results show that Gaussian entropy show the characteristics of asymmetric “normal distribution” with the change of thickness of QD; The decoherence time and Gaussian entropy increases with the increase of electron–phonon coupling constant, dispersion coefficient and dielectric constant ratio, respectively; The decoherence time decreases with the increase of Gaussian potential well depth and electric field intensity, respectively; Gaussian entropy oscillates periodically with time. In addition, it is found that asymmetric Gaussian potential well depth, thickness of QD, dielectric constant ratio and electric field have significant potential to regulate Gaussian entropy and decoherence: When the thickness of the QD is <span>(4.2r_{{text{p}}})</span>, the “abrupt change” of decoherence time from increasing to decreasing with the increase of dielectric constant ratio is observed; A maximum value (peak value) of Gaussian entropy is observed near the thickness <span>(0.23r_{{text{p}}})</span> and some minimum values (valley value) distribution of qubit decoherence time are discovered in the thickness interval <span>((0.4r_{{text{p}}} , , 0.7r_{{text{p}}} ))</span>; In the asymmetric Gaussian potential well depth interval <span>(left( {62.3hbar omega_{{{text{LO}}}} ,,74.5hbar omega_{{{text{LO}}}} } right))</span>, it is found that the Gaussian entropy occurs a “transition” from increasing with the increase of electric field intensity to decreasing. The conclusion of this paper will provide a theoretical basis for the experimental scheme to regulate the different characteristics of QD carrier such as the dispersion coefficient, electron–phonon coupling constant, dielectric constant ratio and electric field.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645622","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":"Probing quantum correlations in non-degenerate hyper-Raman process","authors":"Moumita Das,&nbsp;Biswajit Sen,&nbsp;Ankur Sensharma,&nbsp;Kishore Thapliyal,&nbsp;Anirban Pathak","doi":"10.1140/epjp/s13360-025-06161-y","DOIUrl":"10.1140/epjp/s13360-025-06161-y","url":null,"abstract":"<div><p>Possibilities of observing single mode and intermodal quantum correlations (e.g., antibunching, steering and entanglement) are studied for a probed-hyper-Raman system. The physical system studied here considers that a probe interacts continuously with the non-degenerate pump modes in the hyper-Raman active system via a nonlinear coupling. Using the dynamics of the system in a complete quantum treatment, the impact of the probe on the single and multi-mode quantum correlations generated in a hyper-Raman active system is studied. The investigation has revealed that quantum correlations in the hyper-Raman systems can be controlled using the probe. Specifically, the quantum steering between the pump and anti-Stokes modes can be influenced significantly by controlling the interaction between the system and the probe. Unlike steering, probe could neither deteriorate the nonclassical correlations, namely intermodal entanglement and photon antibunching, nor induce them.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638328","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":"Protection of population and workers with cardiac implantable stimulators from 5G exposure. Part II: base station antennas exposure","authors":"Cecilia Vivarelli,&nbsp;Giovanni Calcagnini,&nbsp;Federica Censi,&nbsp;Settimio Pavoncello,&nbsp;Daniele Franci,&nbsp;Giancarlo Burriesci,&nbsp;Eugenio Mattei","doi":"10.1140/epjp/s13360-025-06167-6","DOIUrl":"10.1140/epjp/s13360-025-06167-6","url":null,"abstract":"<div><p>The study investigates the potential risks of electromagnetic interference (EMI) from 5G signals on cardiac implantable electronic devices (CIED). Given the increasing prevalence of these devices and the widespread adoption of 5G technology, it is crucial to ensure the radiation protection of both workers and general population based on scientific evidence. The research introduces a novel measurement setup able to reproduce the actual signals adopted by 5G providers, focusing on the downlink scenario where the CIED is in proximity to a base station antenna. The study tested the pacing, sensing and high-voltage therapy delivery of 5 implantable defibrillators from major manufacturers under realistic exposure conditions and worst-case scenarios in terms of E-field level, timing and frequency characteristics of the 5G signal. 5G signals were generated at two frequencies (736 and 3680 MHz) and with three modalities (continuous wave, 5G full-traffic and 5G gated). A total of 90 measures were collected, and the results showed that the interfering signal generated according to the actual 5G protocol did not cause any EMI events. The proposed setup could also represent a useful tool for expressing the EMC immunity levels of CIEDs in terms of unperturbed E-field strength. This research demonstrates that 5G mobile terminals do not pose significant risks to PM/ICD wearers and provides important data, enhancing the current understanding of the EMI impact of 5G technology on critical medical devices.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645535","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":"Determination of photovoltaic parameters of cobalt phosphosulfide (CoSP) based heterostructure: a new candidate in thin-film solar cells","authors":"Ali Raza,&nbsp;Habib Ullah Khan,&nbsp;Muhammad Sajid,&nbsp;Sameen Maqsood,&nbsp;Zohaib Ali,&nbsp;Shavezah Nazeer,&nbsp;Faizan Ali,&nbsp;Shenggao Wang","doi":"10.1140/epjp/s13360-025-06060-2","DOIUrl":"10.1140/epjp/s13360-025-06060-2","url":null,"abstract":"<div><p>This paper represents a theoretical analysis for simulating a pyrite-type CoSP-based (a new type of) solar cells by a n-CdS/p-CoSP heterostructure. The aim of this study is to investigate the feasibility of the CoSP as an absorber material in the field of thin-film solar cells. Subsequently, a relation between material parameters and characteristics of the cell has been established. The bandgap values (1.15 to 1.65 eV) of CoSP are extremely suitable for fabrication of solar cell as anticipated by Shockley–Queisser theory. Though, the cell performance reduces due to increase of the buffer layer thickness. The maximum absorber layer thickness was about 2 μm, beyond this value the efficiency not significantly increase. The optical absorption reduces due to the increase of absorber bandgap, which leads to decrease in open circuit voltage and photocurrent density. The cooperation between these two phenomena results maximum conversion efficiency of <span>(approx)</span> 28% at bandgap value of 1.15 eV. All the simulation results provide an indication for the feasibility of CoSP as a new photovoltaic candidate. Therefore, experimental data have been called for the validity of our predictions.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645581","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":"Raman approach to investigate painted decorations and manufacture technology of fake Greek and Italic pottery: a contribution to authentication","authors":"Antonella Privitera,&nbsp;Marta Sardara,&nbsp;Armida Sodo","doi":"10.1140/epjp/s13360-025-06168-5","DOIUrl":"10.1140/epjp/s13360-025-06168-5","url":null,"abstract":"<div><p>Faking manufacture of ancient pottery is a phenomenon connected to the circulation and trade of unknown archaeological objects, aimed at increasing the earnings of unscrupulous sellers. In this traffic, craftsmen use pseudoscientific skills to produce modern artefact inspired to the ancient ones for fraudulent purposes, mimicking the original materials and ancient manufacturing technologies. In the authentication of decorated ancient pottery, micro-Raman spectroscopy can provide a contribution to the study of constituent materials and manufacturing processes, thanks to the possibility of obtaining data in non-destructive mode or by micrometric samples and to its high sensibility to detect mineralogical and low-crystallinity phases in the decoration. This paper is focused on the characterisation of mineralogical compounds in black glazes and in polychrome overpainted decorations of pseudo-archaeological potteries, which embody different levels of forger’s skill, corresponding to an increasing gradualness in the interpretative complexity of the data acquired. For each case study, the specific contribution of micro-Raman spectroscopy to the characterisation of the surface decorations is highlighted, thus providing important clues about the counterfeiters <i>modus operandi</i> and suggesting its possible use as one of the tools for a multi-analytical authentication protocol for this kind of pottery artefacts.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-025-06168-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645623","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":"Uncovering the soliton solutions and interaction aspects of combined CBS-nCBS model utilizing Bäcklund transform","authors":"Nauman Raza,&nbsp;Beenish Rani,&nbsp;Patricia J. Y. Wong,&nbsp;Yahya Almalki,&nbsp;Mustafa Bayram","doi":"10.1140/epjp/s13360-025-06171-w","DOIUrl":"10.1140/epjp/s13360-025-06171-w","url":null,"abstract":"<div><p>The Calogero-Bogoyavlenskii-Schiff (CBS) equation is a nonlinear integrable partial differential equation that plays a significant role in studying solitons, wave interactions, and various physical phenomena, including fluid dynamics and optical fibers. This work focuses on solving the (3+1)-dimensional combined CBS-negative-order CBS (CBS-nCBS) equation using multiple analytical techniques. First, the Hirota bilinear form is employed to derive the Bäcklund transformation through different exchange identities. This transformation yields exponential and rational function solutions, enabling the identification of singular and kink solitons. Additionally, by applying various ansatzes within the bilinear framework, we construct two-wave, three-wave, multi-wave, and breather solutions, providing deeper insights into the equation’s characteristics. Furthermore, the given model is transformed into an ordinary differential equation via a traveling wave transformation. The <span>(G'/(bG' + G + a) )</span> method is then applied to extract solutions involving trigonometric and hyperbolic functions, leading to periodic and kink solitons. The graphical representations presented in this study are instrumental in visualizing the intricate dynamics of these solutions. The findings enhance our understanding of the diverse soliton structures and broaden the potential applications of the CBS equation.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638228","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":"Covalency and energy properties of inter-molecular interaction between ozone and N2, CO monomers","authors":"Xinying Li","doi":"10.1140/epjp/s13360-025-06169-4","DOIUrl":"10.1140/epjp/s13360-025-06169-4","url":null,"abstract":"<div><p>First principle calculations were performed on the structures, energy properties, and covalent character of weak inter-molecular interactions of O₃…CO, O₃…OC and O₃…N₂ dimers. SAPT analysis demonstrates the importance of dispersion energies with contributions to the total inter-molecular interaction energies of 47–61%; and the electrostatic energies show increasing importance for the enhanced inter-molecular interactions with contributions of about 31–41%. Within the frame of AIM theory, dual parameters at bond critical points (BCP), Laplacian and energy density values, indicate the noncovalent regime of weak inter-molecular interactions. Meanwhile, values of ELF and -G/V ratio confirm the non-covalent character. Quantitative results given by NRT show “zero” covalent contributions. Furthermore, analysis of delocalization index (DI) shows negligible shared electrons by the inter-molecular interaction atomic pair basins.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632407","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":"Nonreciprocity in a rotational cavity system","authors":"Ghaisud Din,&nbsp;Muqaddar Abbas,&nbsp;Yunlong Wang,&nbsp;Feiran Wang,&nbsp;Pei Zhang","doi":"10.1140/epjp/s13360-025-06189-0","DOIUrl":"10.1140/epjp/s13360-025-06189-0","url":null,"abstract":"<div><p>We investigate a system of two coupled optical cavities driven by control and probe fields, where photon tunneling and a common rotational mirror influence the photon dynamics. The investigation explores the effects of control field power, photon tunneling strength, and the phase difference between the control fields on the probe field responses in each cavity. When the control fields in both cavities are coherent, with a phase difference and a nonzero photon tunneling strength, the system exhibits nonreciprocal behavior. Specifically, the probe field in cavity <span>(a_{1})</span> shows a transparency window, while the probe field in cavity <span>(a_{2})</span> exhibits absorption, with the opposite behavior observed by changing the phase difference. This asymmetry arises from the interaction between photon tunneling and phase difference, which induces asymmetric coupling between the cavities. Our findings highlight the critical role of photon tunneling and phase difference in generating nonreciprocal behavior in coupled cavity systems and provide insights into their potential application in nonreciprocal optical devices.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638230","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":"Theoretical investigation of transverse limiting frequency, electrical permittivity, and loss factor of KH2PO4(KDP) crystal using a modified pseudospin model","authors":"Riya Upadhyay,&nbsp;S. C. Bhatt","doi":"10.1140/epjp/s13360-025-06142-1","DOIUrl":"10.1140/epjp/s13360-025-06142-1","url":null,"abstract":"<div><p>Potassium dihydrogen phosphate, KH₂PO₄ (KDP) crystal is an order–disorder type ferroelectric crystal. Earlier model Hamiltonian used by Ganguli et al. is modified by adding other terms to investigate transverse limiting frequency, permittivity, and loss factor in potassium dihydrogen phosphate (KDP) crystal. Green function formalism is used for derivation of formulae. Calculated results agree with experimental data reported by Kaminow and Harding for potassium dihydrogen phosphate KH₂PO₄ crystal. New terms play important role in explaining quantitatively the transverse limiting frequency, electrical permittivity, and loss factor in potassium dihydrogen phosphate (KDP) crystal.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638227","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":"Insights into the coexistence of tunneling, hopping and jump models controlling the conduction phenomenon in doped lanthanum manganite compound","authors":"A. Ghodhbani,&nbsp;W. Hizi,&nbsp;H. Rahmouni,&nbsp;K. Khirouni,&nbsp;E. Dhahri","doi":"10.1140/epjp/s13360-025-06179-2","DOIUrl":"10.1140/epjp/s13360-025-06179-2","url":null,"abstract":"<div><p>The present investigation provides different possible reasons to explain the change of the conduction process in the studied material. Doped lanthanum manganite compound was successfully prepared using the conventional solid-state method. XRD patterns are used to confirm the formation of the desired manganite compound. Under both of the temperature and frequency effects, the charge dynamics are deeply investigated. The conductivity spectra obey to double Jonscher power law (DJPL), single Jonscher power law (JPL) and the classical Drude model. Successful and unsuccessful jumps describe the AC-conductivity regime in the dispersive frequency region. In the intermediate frequencies, the transport properties are explained by classical hopping (CBH) and tunneling (NSPT) models. The low-frequency range is associated to the DC-conductivity regime. The latter shows the possibility of contribution of three hopping models in the transport properties. The change in such conduction model is synchronized with ANC temperature that describes the temperature at which the trapped centers are vanished. Such observations prove the possibility of the presence of multi-trapped centers. Shimakawa model, that assumes the presence of multi-phonons, was equally used to understand the charge carriers dynamics in the intermediate temperatures. The matching between complex impedance and conductivity analyses confirms the presence of relaxation process which is related to charge carries hopping.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638229","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}