Results in Physics最新文献

{"title":"Zintl germanides for thermoelectric applications: Insights from DFT and Boltzmann transport theory","authors":"Souraya Goumri-Said ,&nbsp;Sikander Azam ,&nbsp;Bakhtiar Ul Haq ,&nbsp;Mohammed Benali Kanoun","doi":"10.1016/j.rinp.2025.108119","DOIUrl":"10.1016/j.rinp.2025.108119","url":null,"abstract":"<div><div>We present a comprehensive theoretical investigation of the electronic and thermoelectric properties of Zintl germanides AeNiGe (Ae = Mg, Sr, Ba) using density functional theory (DFT) combined with Boltzmann transport theory. Our calculations reveal that all three compounds exhibit metallic behavior, with notable differences in their electronic band structures and density of states. Analysis of the partial density of states shows that the bands near the Fermi level are primarily composed of Ni-<em>d</em> and Ge-<em>p</em> states, with varying contributions from the alkaline earth metals’ orbitals. The thermoelectric properties, calculated using the BoltzTraP code within the relaxation time approximation, indicate a strong dependence on temperature and chemical potential. Ba- and Sr-based compounds demonstrate superior thermoelectric performance compared to Mg-based counterparts, achieving maximum Seebeck coefficients of approximately 40 µV/K at 450 K under negative chemical potentials (−2.00 eV). Additionally, Ba- and Sr-based materials exhibit significantly lower thermal conductivity (below 1 W/mK at high temperatures) compared to Mg-based materials (up to 7 W/mK). These findings suggest that BaNiGe and SrNiGe are promising candidates for thermoelectric applications, offering an optimal balance of high Seebeck coefficient, moderate electrical conductivity, and low thermal conductivity. Our results provide valuable insights for the design and ptimization of Zintl-based thermoelectric materials for energy conversion applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"69 ","pages":"Article 108119"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149257","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":"Dynamically scattering medium-based security-enhanced optical image encryption using orbital angular momentum and deep learning","authors":"Junbao Hu ,&nbsp;Xutao Mo ,&nbsp;Yu Lei ,&nbsp;Xianshan Huang ,&nbsp;Dong Wang","doi":"10.1016/j.rinp.2024.108100","DOIUrl":"10.1016/j.rinp.2024.108100","url":null,"abstract":"<div><div>Scattering medium-based optical image encryption is a practical strategy for information security, but it is challenging to convert speckles caused by scattering into encrypted information. In addition, the security level of the encryption is an issue of concern. Here we propose and demonstrate a potential optical image encryption with high security, in particular using optical orbital angular momentums (OAMs) to carry plaintext information so that encrypted information can be coded and converted into speckles, besides a dynamic diffuser for encryption and a pre-trained convolutional neural network (CNN) model for decryption. The high level of security stems from the use of both <em>the order key</em> (one-to-one correspondence between the labelled OAMs and the speckles) and <em>the model key</em> (unduplicatable pre-trained CNN model). Proof-of-concept experiments to demonstrate the proposed method have been successfully carried out. The image encryption method can open up new prospects for authentication, anti-counterfeiting and encrypted communication.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"69 ","pages":"Article 108100"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149259","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":"Strain-engineering quantum anomalous hall state in janus MnBi2SexTe4−x monolayers","authors":"Jiale Chen ,&nbsp;Pengfei Li ,&nbsp;Jun Hu","doi":"10.1016/j.rinp.2025.108115","DOIUrl":"10.1016/j.rinp.2025.108115","url":null,"abstract":"<div><div>Exploring intrinsic magnetic topological insulators (TIs) for next-generation spintronic devices is still challenging in recent years. Here, we present a theoretical investigation on the electronic, magnetic and topological properties of monolayer (ML) Janus MnBi₂Se_xTe_4−x (1 ≤ x ≤ 3), derived from two trivial magnetic semiconductors ML MnBi₂Se₄ and MnBi₂Te₄. Our band structure analysis reveals that two out of the six Janus structures exhibit band inversion induced by spin–orbit coupling. These structures are confirmed to have nonzero integer Chern numbers, indicating their topological nature. Moreover, the topological state is robust under moderate biaxial strains. Interestingly, applying compressive strain results in a high Chern number of 2 and enhances their magnetic stability at elevated temperatures. Our findings offer an effective strategy to engineer magnetic TI states within the ML MnBi₂Te₄ family.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"69 ","pages":"Article 108115"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149254","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":"Influence of entropy changes on first passage time in the thermodynamics of trajectories","authors":"V.V. Ryazanov","doi":"10.1016/j.rinp.2025.108128","DOIUrl":"10.1016/j.rinp.2025.108128","url":null,"abstract":"<div><div>An ensemble of trajectories with dynamical activity and first-passage time (<em>FPT</em>) is considered in the context of the thermodynamics of trajectories. The relationship between the average <em>FPT</em> and the total change in entropy is determined, with a focus on non-negative values of the total change in entropy only. Similar dependencies were found for dynamic activity, the dispersion of dynamic activity, and <em>FPT</em>, as well as for the correlation between dynamic activity and <em>FPT</em>. Applying the obtained results to model systems reveals dependencies on entropy changes in stationary nonequilibrium and equilibrium states. To relate changes in entropy to the conjugate parameter of the <em>FPT</em>, three models of the distribution function are applied to classical two- and three-level systems, and to a quantum two-level system.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"69 ","pages":"Article 108128"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150225","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":"Investigation of Nd3+-doped oxide and oxy-fluorotellurite glasses for optical and radiation shielding applications","authors":"B. Karthikeyan ,&nbsp;M. Venkateshprabhu ,&nbsp;R. Praveena ,&nbsp;Upendra Kumar Kagola ,&nbsp;M.I. Sayyed ,&nbsp;N. Manikandan","doi":"10.1016/j.rinp.2025.108111","DOIUrl":"10.1016/j.rinp.2025.108111","url":null,"abstract":"<div><div>This paper compares the impact of incorporating barium in oxide and fluoride form in tellurite host matrix on the glass properties for varied applications. It is found that BaO doped glass exhibits higher density and energy bandgap values compared to that with BaF₂. The presence of non-bridging sites that are related to fluorine and oxygen results in the dominance of the 748 cm⁻¹ peak in the Raman spectra. The spectroscopic quality factor for both samples was calculated to be above one, with the calculated and experimental radiative lifetime being larger for sample with BaF₂. The fluorescence peak positions were shifted due to the changes in the glass network. Radiation shielding values, calculated using Phy-X/PSD software, indicated that the BaF₂ based glass host has better attenuation coefficients, half value layer, and mean free path compared to the BaO doped glass.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"69 ","pages":"Article 108111"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149253","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":"X-ray phase contrast imaging and diffraction in the laser-heated diamond anvil cell: A case study on the high-pressure melting of Pt","authors":"Emma Ehrenreich-Petersen ,&nbsp;Bernhard Massani ,&nbsp;Thea Engler ,&nbsp;Olivia S. Pardo ,&nbsp;Konstantin Glazyrin ,&nbsp;Nico Giordano ,&nbsp;Johannes Hagemann ,&nbsp;Daniel Sneed ,&nbsp;Timofey Fedotenko ,&nbsp;Daniel J. Campbell ,&nbsp;Mario Wendt ,&nbsp;Sergej Wenz ,&nbsp;Christian G. Schroer ,&nbsp;Mathias Trabs ,&nbsp;R.Stewart McWilliams ,&nbsp;Hanns-Peter Liermann ,&nbsp;Zsolt Jenei ,&nbsp;Earl F. O’Bannon","doi":"10.1016/j.rinp.2025.108132","DOIUrl":"10.1016/j.rinp.2025.108132","url":null,"abstract":"<div><div>Melting temperatures of materials at high-pressure are one of the key physical properties that can be measured. However, large discrepancies in high-pressure melt lines exist between different experimental and theoretical approaches. In this paper, we present a novel approach for melting determination at high pressure where time-resolved synchrotron X-ray phase contrast imaging is used to observe the solid to liquid phase transition in laser heated samples in the diamond anvil cell along with simultaneous X-ray diffraction. Optical radiometric temperature measurements are correlated with the observed phase boundaries determined from X-ray phase contrast images and structural information from X-ray diffraction patterns to determine the melting temperature. We benchmarked this new technique with experiments on the high-pressure melting of platinum (Pt). Our new Pt melting results are compared with several recent studies on the high pressure melt line of Pt which utilized different techniques to determine melting. The technique can readily be applied to other materials and offers great potential for the determination of accurate and precise melting temperatures.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"69 ","pages":"Article 108132"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150221","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":"Comparative investigation of dielectric, magnetic, and adsorption aspects of ZnO nanoparticles doped by Er or Nd","authors":"Mansour Mohamed ,&nbsp;Abdullah F. Al–Naim ,&nbsp;Abdullah Almohammedi ,&nbsp;A. Sedky","doi":"10.1016/j.rinp.2025.108113","DOIUrl":"10.1016/j.rinp.2025.108113","url":null,"abstract":"<div><div>Here, we compare the structural, dielectric, magnetic, and adsorption properties of two series of Zn_1-xRE_xO nanoparticles (NPs) with x  ≤ 0.20 and RE = Er or Nd. The majority of structural metrics are raised against x up to 0.10 in all NPs samples; however, they are higher for the Nd samples. The opposite behavior is also true for the ac electrical conductivity and dielectric constant against x, although they are higher for the Er samples. The quality factor, impedance, and series resistance are significantly increased against x, whereas the equivalent capacitance was decreased, such that they are higher for the Nd samples. The ZnO NPs exhibited poor ferromagnetic behavior of saturated magnetization (M_s) of 0.018 (emu/g). In contrast, the RE-doped ZnO NPs show ferromagnetic behavior such that the highest values of Ms (0.514 and 0.463 emu/g) obtained at x  = 0.10 for Er and Nd. Furthermore, the RE ions shift the ZnO NPs from soft to hard magnetic materials along with high values of all magnetic parameters. Moreover, the ZnO NPs had the highest switching field distribution (SFD) of 60.95 Oe, whereas the incorporation of Er or Nd in the ZnO NPs induced a further reduction in SFD to 5.31 or 10.56 Oe. The 0.10 Er NPs show the highest values of surface area (SA) and dye removal (DR%) of 63.22 m²/g and 72.07 %, respectively, whereas the lowest values of 38.89 m²/g and 59.49 % were obtained for ZnO NPs, and meanwhile the 0.10 Nd NPs (51.95 m²/g and 63.77 %). This investigation paves the way for the original of RTFM in the RE-doped ZnO NPs and is a promising candidate for some of the more advanced devices.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"69 ","pages":"Article 108113"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149256","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":"Simulation of vortex ion generation from a cold atom ion source","authors":"Xuan Liu ,&nbsp;Wenchang Zhou ,&nbsp;Qi Meng ,&nbsp;Zhen Yang ,&nbsp;Wei Ma ,&nbsp;Liang Lu ,&nbsp;Pengming Zhang ,&nbsp;Liping Zou","doi":"10.1016/j.rinp.2025.108123","DOIUrl":"10.1016/j.rinp.2025.108123","url":null,"abstract":"<div><div>Vortex waves with orbital angular momentum (OAM) have garnered significant attention since their appearance due to their unique properties. Vortex beams are experimentally demonstrated with photons, electrons, neutrons, and atoms. However, it is still challenging to make ions with large masses produce vortex states. This study describes a scheme for generating vortex ion beams with a cold atom ion source (CAIS). In CAIS, ions are obtained by near-threshold photoionization rubidium atoms in magneto-optical trap (MOT). We investigate the propagation properties of the rubidium ion beams through simulations. In the simulation, rubidium ions extract from the CAIS and generate vortices by diffracting with holograms, where the phase of the wavefunction is changed. We analyze in detail the structure and voltage of the CAIS and propose a feasible scheme for generating vortex ions in laboratory experiments. Additionally, we propose two alternatives, one is to reduce the velocity of the ions lower, another is to use a magnetic needle to generate vortex ions. These proposals provide a new pathway for future explorations into the generation and properties of vortex ion beams.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"69 ","pages":"Article 108123"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149250","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":"Highly efficient CeF3/ZnO nanocomposite for the degradation of organic dye under visible light irradiation","authors":"Muhammad Sajjad ,&nbsp;Samia Qureshi ,&nbsp;Jamshid Khan ,&nbsp;Khalid Hussain Thebo ,&nbsp;Ahmed Nadeem ,&nbsp;Sabry M. Attia","doi":"10.1016/j.rinp.2025.108134","DOIUrl":"10.1016/j.rinp.2025.108134","url":null,"abstract":"<div><div>In this study, cerium cerium fluoride/zinc oxide (CeF₃/ZnO) nanocomposites were prepared using a simple co-precipitation method with different weight percent ratios of CeF₃ (1, 3, 5, 7, and 9 wt%). The as-synthesized nanocomposites were characterized by different techniques, i.e., X-rays diffraction (XRD), scanning electron microscope (SEM), fourier-transform infrared (FTIR) spectroscopy, etc., for their identification and structural characterization. The as-prepared nanocomposites were used for the photocatalytic degradation of methyl orange (MO) dye. The CeF₃/ZnO nanocomposite with 1 % ratio CeF₃ nanoparticles (NPs) showed 85 % degradation of MO dye within 40 min, while the CeF₃/ZnO nanocomposite with a 9 % of CeF₃ NPs showed 90 % degradation of MO dye in 70 min. Therefore, it can be concluded that only a particular amount of CeF₃ in ZnO completely degraded the dye in a short time. This study showed that increasing the doping concentration decreased the degradation efficiency. In addition, CeF₃ NPs were also prepared for comparative studies. The as-prepared nanostructured materials showed excellent photocatalytic activity and can be used for the degradation of other environmental pollutants in the future.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"69 ","pages":"Article 108134"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149261","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":"InP/ZnS core/shell quantum dots: Synthesis, characterization and their application in fullerene derivative based flexible solar cells","authors":"Chen Zhichu ,&nbsp;Muhammad Tahir ,&nbsp;Fida Muhammad ,&nbsp;Fakhra Aziz ,&nbsp;Ambreen Ayub ,&nbsp;Fazal Badshah ,&nbsp;Moamen S. Refat ,&nbsp;Sadiye M. Cakmak ,&nbsp;Shanza Rehan ,&nbsp;Abdel Majid A. Adam ,&nbsp;Amnah Mohammed Alsuhaibani ,&nbsp;Afida Ayob ,&nbsp;Mahidur R Sarker ,&nbsp;Adam Khan","doi":"10.1016/j.rinp.2025.108120","DOIUrl":"10.1016/j.rinp.2025.108120","url":null,"abstract":"<div><div>Herein, we report on the synthesis and characterization of p-type semiconductor indium phosphide/zinc sulphide (InP/ZnS) core/shell quantum dots (QDs) prepared via a simple solvothermal method and their potential application in bulk heterojunction (BHJ) flexible solar cell (SC). The BHJ SC composed of donor–acceptor (D-A) configuration at nanoscale provides larger interfacial junction area throughout the bulk volume of the photo-absorber D-A blend that facilitates excitons to efficiently dissociate within the bulk layer at D-A interface. Hence, InP/ZnS core–shell QDs and a fullerene derivative – phenyl C61 butyric acid methyl ester (PCBM) – are used as hybrid inorganic–organic D-A materials, respectively, to fabricate Ag/LiF/InP/ZnS-PCBM/P3HT/ITO/PET BHJ flexible SC. Indium tin oxide (ITO) coated on polyethylene terephthalate (PET), poly(3-hexylthiophene) (P3HT), lithium fluoride (LiF) and silver (Ag) are employed as a flexible substrate, hole transport layer (HTL), electron transport layer (ETL) and counter electrode, respectively. Photovoltaic (PV) properties of the fabricated BHJ flexible SC are studied under standard testing conditions (STC) i.e., 25 ⁰C, 1.5 AM global and 100 mW/<span><math><mrow><msup><mrow><mi>c</mi><mi>m</mi></mrow><mn>2</mn></msup></mrow></math></span> irradiation, which exhibit fill factor (FF) of 59 ± 0.02 % and power conversion efficiency (PCE) of 4.22 ± 0.05 %. Also, the heterojunction characteristics are investigated in dark condition (0 lx) to find series resistance (R_s), ideality factor (n), and reverse saturation current (I₀). X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM) and ultraviolet–visible (UV–vis) spectroscopy are performed to further investigate the properties of InP/ZnS-PCBM thin films. Transmission electron microscopy (TEM) image of InP/ZnS core/shell QDs confirmed the successful synthesis of QDs having an average size of 5 ± 1 nm. The InP/ZnS-PCBM D-A photo-absorber layer reveals its potential as one of good candidates for high performance BHJ flexible SCs.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"69 ","pages":"Article 108120"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149255","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}