Results in Physics最新文献

{"title":"Optimizing mechanical entanglement using squeezing and parametric amplification","authors":"Muhdin Abdo Wodedo ,&nbsp;Tesfay Gebremariam Tesfahannes ,&nbsp;Tewodros Yirgashewa Darge ,&nbsp;Berihu Teklu","doi":"10.1016/j.rinp.2025.108364","DOIUrl":"10.1016/j.rinp.2025.108364","url":null,"abstract":"<div><div>We propose a scheme of an optomechanical system that optimizes entanglement in nanomechanical resonators through quantum state transfer of intracavity squeezing and squeezed reservoir field sources assisted by radiation pressure. The system is driven by red-detuned laser fields, which enable simultaneous cooling of the mechanical resonators and facilitate the quantum state transfer in a weak coupling and good cavity limit. Specifically, the mechanical entanglement is quantified using logarithmic negativity within the bipartite Gaussian states of the two mechanical modes. The results show that several key parameters, including the parametric phase and nonlinear gain of the non-degenerate optical parametric amplifier, the strength of the squeezing reservoir, optomechanical cooperativity, thermal excitation of phonons, and the temperature of mechanical baths, strongly influence the degree of mechanical entanglement. Hence, the findings indicate that careful tuning of the parameters can enable control over the enhancement of entanglement robustness, suggesting that this optomechanical scheme provides a viable pathway for applications in quantum sensing and information processing</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"76 ","pages":"Article 108364"},"PeriodicalIF":4.4,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713132","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":"Dielectric property enhancement and environmental stability in (AlxCr0.05−x)Nb0.05Ti0.9O2 ceramics: influence of Al3+/Cr3+ ratio and Al3+ site preference","authors":"Porntip Siriya ,&nbsp;Jurimart Wongsricha ,&nbsp;Nutthakritta Phromviyo ,&nbsp;Atchara Khamkongkaeo ,&nbsp;Wirat Jarernboon ,&nbsp;Pornjuk Srepusharawoot ,&nbsp;Prasit Thongbai","doi":"10.1016/j.rinp.2025.108374","DOIUrl":"10.1016/j.rinp.2025.108374","url":null,"abstract":"<div><div>The development of TiO₂-based ceramics with enhanced dielectric properties and environmental stability is crucial for next–generation capacitor applications. In this study, (Al<em>_x</em>Cr_0.05–<em>_x</em>)Nb_0.05Ti_0.9O₂ ceramics (<em>x</em> = 0, 0.005, 0.01, and 0.025) were synthesized to investigate the role of Al³⁺/Cr³⁺ ratio and Al³⁺ site preference on dielectric behavior. All sintered ceramics exhibited a single–phase rutile TiO₂ structure with dense microstructures and uniform elemental distribution. Raman and structural analyses indicated the presence of oxygen vacancies in Cr_0.05Nb_0.05Ti_0.9O₂, which were significantly reduced upon Al³⁺ incorporation, suggesting a predominant interstitial occupation of Al³⁺. Partial substitution of Cr³⁺ with Al³⁺ improved densification and grain growth, likely due to interstitial diffusion. Although Cr_0.05Nb_0.05Ti_0.9O₂ showed a high dielectric permittivity (ε′ ≈ 60,500 at 1 kHz), it suffered from a high loss tangent (tanδ ≈ 0.3) and poor frequency and temperature stability. With increasing Al³⁺ content, ε′ remained above 10⁴ while tanδ decreased below 0.1, and both frequency and temperature stability were greatly improved. The dielectric variation under 30–95 % RH was less than 4.2 %, and long–term aging over 5 years resulted in &lt;1.2 % deviation, demonstrating excellent environmental stability. Impedance spectroscopy confirmed electrically heterogeneous microstructures composed of semiconducting grains and insulating grain boundaries, suggesting that the giant dielectric response arises from an interfacial polarization mechanism. These results highlight the promising potential of (Al<em>_x</em>Cr_0.05–<em>_x</em>)Nb_0.05Ti_0.9O₂ ceramics for robust dielectric capacitor applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108374"},"PeriodicalIF":4.4,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704130","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":"Interaction mechanisms between C15 Laves phase clusters and 〈1 1 1〉 dislocation loops in BCC-Fe: An atomistic perspective","authors":"Amin Esfandiarpour","doi":"10.1016/j.rinp.2025.108366","DOIUrl":"10.1016/j.rinp.2025.108366","url":null,"abstract":"<div><div>Small C15 Laves phase clusters are extended interstitial defects that form during collision cascades in body-centered cubic (BCC) iron. Although their stability has been confirmed by ab initio calculations up to a certain size, their interactions with other irradiation-induced defects, such as dislocation loops, remain poorly understood. In this study, we use molecular dynamics (MD) and molecular statics (MS) simulations to investigate the interaction mechanisms between C15 clusters and /2〈1 1 1〉 prismatic dislocation loops in BCC-Fe at elevated temperatures (600–1000 K). By systematically varying the relative size and positioning of these defects, we identify three distinct interaction modes: absorption, repulsion, and confinement. Absorption events lead to a range of outcomes depending on the interaction geometry, including complete merging into 1/2〈1 1 1〉 or 〈1 0 0〉 dislocation loops, or the formation of mixed clusters. Stress field analysis reveals that the nature of these interactions is governed by the overlap of elastic fields, with repulsive or attractive behavior arising from the alignment of tensile and compressive regions. These findings provide new atomistic insights into the role of C15 clusters in microstructural evolution under irradiation and offer valuable input parameters for higher-scale modeling techniques such as object kinetic Monte Carlo (OKMC).</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108366"},"PeriodicalIF":4.4,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144696943","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":"Synergistic enhancement of SERS and superhydrophobicity on Si micropatterns fabricated with two-beam laser interference lithography","authors":"Sadaf Saeed ,&nbsp;Mohamed Hassan Eisa ,&nbsp;Ali Zia ,&nbsp;Kinza Arshad","doi":"10.1016/j.rinp.2025.108365","DOIUrl":"10.1016/j.rinp.2025.108365","url":null,"abstract":"<div><div>This study introduces a novel approach for enhancing both surface-enhanced Raman scattering (SERS) sensitivity and super-hydrophobicity of silicon micropatterns (SiMPs) fabricated through two-beam laser interference lithography (TBLIL). By integrating micro/nanostructured Si surfaces with superior SERS performance and hydrophobic properties, this platform holds promise for advanced sensing and self-cleaning applications. The TBLIL method offers precise control over micropattern geometry and periodicity, creating localized “hot spots” that amplify the Raman signals, facilitating the detection of low-concentration analytes with high sensitivity. Additionally, the microstructured surface ensures superhydrophobicity, prevents contamination, and enhances the stability and reproducibility of SERS measurements. Characterization techniques, including scanning electron microscopy (SEM), Atomic force microscope (AFM), Raman spectroscopy, and contact angle measurements, confirmed significant improvements in the SERS sensitivity and durability of the superhydrophobic surface. This dual-functional platform opens new avenues in biosensing, environmental monitoring, and surface coatings, offering a versatile solution to challenges in materials science and nanotechnology.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108365"},"PeriodicalIF":4.4,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672187","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":"Nonequilibrium spin dynamics in the chiral soliton lattice host YbNi3Al9","authors":"Yamei Wang ,&nbsp;Haonan Jin ,&nbsp;Jiefeng Cao ,&nbsp;Rui Yu ,&nbsp;Junqin Li ,&nbsp;Wei Tong ,&nbsp;Junmin Xu ,&nbsp;Fangyuan Zhu ,&nbsp;Yong Wang ,&nbsp;Lei Zhang ,&nbsp;Renzhong Tai","doi":"10.1016/j.rinp.2025.108336","DOIUrl":"10.1016/j.rinp.2025.108336","url":null,"abstract":"<div><div>The uniaxial chiral magnetic material YbNi₃Al₉ is proposed as a host for a chiral soliton lattice (CSL). In this study, we thoroughly investigate the spin dynamics in YbNi₃Al₉ single crystals using magnetization (<span><math><mi>M</mi></math></span>)-relaxation and electron spin resonance (ESR) techniques. The <span><math><mi>M</mi></math></span>-relaxation analysis clearly reveals characteristics of a nonequilibrium CSL in YbNi₃Al₉. A prolonged relaxation is observed in the highly-nonlinear-CSL state, indicating nonequilibrium spin dynamics during the annihilation or nucleation of chiral magnetic solitons, consistent with the unfrustrated magnetic cluster model. The ESR study shows significant microwave responses when the magnetic field is applied perpendicular to the <span><math><mi>c</mi></math></span>-axis (<span><math><mrow><mi>H</mi><mo>⊥</mo><mi>c</mi></mrow></math></span>), while a weak response is observed when the field is aligned with the <span><math><mi>c</mi></math></span>-axis (<span><math><mrow><mi>H</mi><mo>/</mo><mo>/</mo><mi>c</mi></mrow></math></span>). Two resonance lines are identified for <span><math><mrow><mi>H</mi><mo>⊥</mo><mi>c</mi></mrow></math></span>. The resonance signal at lower fields is attributed to the Goldstone excitation of chiral magnetic solitons, while the signal at higher fields is associated with ferromagnetic resonance. These findings enhance our understanding of the nonequilibrium spin dynamics of the CSL in YbNi₃Al₉ single crystals and are beneficial for the application of chiral magnetic solitons in spintronics.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108336"},"PeriodicalIF":4.4,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687289","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 IK-shaped metamaterial with electromagnetically induced transparency for opto-logic and sensing applications","authors":"Tingwei Wang,&nbsp;Daoye Zheng,&nbsp;Yunche Zhu,&nbsp;Wenqing Zheng,&nbsp;Yu-Sheng Lin","doi":"10.1016/j.rinp.2025.108361","DOIUrl":"10.1016/j.rinp.2025.108361","url":null,"abstract":"<div><div>This study presents a multifunctional tunable IK-shaped metamaterial (TIKM) for the applications of opto-logic devices and high-sensitive environmental sensors. The TIKM comprises two distinct components, which are a dynamically movable K-shaped and a stationary I-shaped metamaterials. Simulations reveal that the TIKM exhibits polarization dependent characteristic. By modulating the distance (<em>d</em>) and height (<em>h</em>) parameters between two components, this advancement achieved dynamic modulations over the transmission and electromagnetic responses. The electromagnetic responses indicate that there exist several resonant modes, forming an electromagnetically induced transparency (EIT) effect which is highly connected to structural parameters. This tunability makes TIKM a promising candidate for optical switch and opto-logic gate operation. The logic gate operation is demonstrated by interpreting the vertical and horizontal displacements of the movable K-shaped metamaterial as binary inputs, which can transfer the light signals to physical signals. At 0.587 THz, the gate enters an “XNOR” response, while at 0.703 THz, it exhibits an “AND” response. TIKM exhibits different electromagnetic responses by changing the environmental refractive index from 1.0 to 2.0. The red-shifting range of resonances is 0.660 THz. The maximum quality (Q) factor is 132, with a full width at half maximum (FWHM) of 0.005 THz at 0.667 THz and the maximum sensitivity to the environmentally refractive index changes is 72 GHz/RIU. These results provide the potential for utilization in the fields of intelligent sensing applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108361"},"PeriodicalIF":4.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144679592","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":"Theoretical investigation of multifunctional properties: Electronic, optical, and lattice thermal conductivity characteristics of ZrAlB, NbAlB, and MoAlB","authors":"Shengzhao Wang ,&nbsp;Lanli Chen ,&nbsp;Bin Liu","doi":"10.1016/j.rinp.2025.108359","DOIUrl":"10.1016/j.rinp.2025.108359","url":null,"abstract":"<div><div>In this paper, we investigate the photoelectric properties and thermal conductivity of ZrAlB, NbAlB, and MoAlB using first-principles calculations. Our findings indicate that ZrAlB, NbAlB, and MoAlB exhibit metallic behavior and possess a high absorption coefficient within a specific range. At 0.01 eV photon energy, the static dielectric constants <em>ε₂</em> for ZrAlB, NbAlB, and MoAlB are measured at 109.43, 105.57, and 107.89, respectively. Additionally, the reflectivity of ZrAlB, NbAlB, and MoAlB is notably high, exceeding 35 % in certain frequency bands. The thermal conductivities of ZrAlB, NbAlB, and MoAlB are 3.2 W/(m·K), 6.6 W/(m·K), and 41.0 W/(m·K), respectively, which align with the trends observed in their Grüneisen parameters. This paper provides a comprehensive analysis of the structure, electronic properties, optical properties, and thermal conductivity of these three materials through theoretical calculations, offering a valuable theoretical foundation for their applications in optoelectronics, photothermal technologies, and other fields.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108359"},"PeriodicalIF":4.4,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662352","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":"Interacting dark energy models within the context of the particle creation framework: A dynamical systems study","authors":"Aman Shukla ,&nbsp;Ashutosh Singh ,&nbsp;Raghavendra Chaubey","doi":"10.1016/j.rinp.2025.108350","DOIUrl":"10.1016/j.rinp.2025.108350","url":null,"abstract":"<div><div>In this paper, we employ the dynamical system method to probe the cosmological evolution in a matter creation model admitting interacting dark energy behavior. The set of dynamical variables in this framework allows one to trace the cosmic evolution in comparison to the <span><math><mi>Λ</mi></math></span> cold dark matter (<span><math><mi>Λ</mi></math></span>CDM) model. The critical points in cosmological phase space are analyzed for their stability nature. The numerical integrations of the autonomous system are used to extract the evolution of cosmological quantities of the model, subjected to the initial condition compatible with observational data. The resulting cosmological behavior observed from the dynamical variables, cosmographic parameters and statefinder analysis illustrate the similarity as well as deviations from the <span><math><mi>Λ</mi></math></span>CDM model during different cosmic expansion phases. The autonomous systems are also used to study the classical stability of models under consideration. The interacting dark energy scenario in the matter creation mechanism leads to the universe evolution, which traces their journey from the decelerating phase (composed of radiation and matter phase) into accelerating phase dominated by a negative pressure component, which is directly consistent with observations.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108350"},"PeriodicalIF":4.4,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662351","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":"Theoretical study of the electronic and magnetic properties of Cd1-xMnxTe quantum wire under the combined effects of the applied magnetic field, spin orbit coupling and exchange effects","authors":"Asad Shendi,&nbsp;Mohammad Elsaid,&nbsp;Diana Dahliah","doi":"10.1016/j.rinp.2025.108358","DOIUrl":"10.1016/j.rinp.2025.108358","url":null,"abstract":"<div><div>This paper presents a study for the electronic and magnetic properties of Cd_1-xMn_xTe quantum wire (QW). The Hamiltonian for an electron confined in a quantum wire, in the presence of an external magnetic field and Rashba spin orbit interaction, had been solved. The obtained energy dispersion relation had been used to calculate the electronic structure and display the Landau levels and density of states for different physical Hamiltonian s parameters. The density of states function shows a significant dependence on spin, Rashba, exchange effect and magnetic field. The dependence of the magnetic properties like magnetization and magnetic susceptibility on the magnetic field strength, quantum wire radius, and exchange and Rashba strength parameters have been examined. The computed results show that the material can display a phase transition between Paramagnetic and Diamagnetic types. In addition, an oscillatory behavior in the magnetic susceptibility as a function of magnetic field has been observed. This oscillating behavior is a result of Landau levels crossing in the quantum wire energy spectra.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108358"},"PeriodicalIF":4.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687288","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-based prediction of proton-induced reaction cross-sections for medically relevant bromine radioisotopes","authors":"Parichehr Khalilzadeh ,&nbsp;S. Farhad Masoudi ,&nbsp;Hassan Yousefnia ,&nbsp;Fatemeh S. Rasouli","doi":"10.1016/j.rinp.2025.108357","DOIUrl":"10.1016/j.rinp.2025.108357","url":null,"abstract":"<div><div>Accurate prediction of nuclear reaction cross-sections is essential for optimizing the production of medically relevant radioisotopes. In this study, we investigate proton-induced reactions on selenium isotopes leading to the formation of bromine radioisotopes (⁷⁵Br, ⁷⁶Br, ⁷⁷Br, and ^80mBr) using machine learning (ML) techniques. A total of 499 experimental data points were extracted from the EXFOR database and processed using Savitzky–Golay filtering and cubic spline interpolation to reduce noise and augment the dataset. Feature engineering incorporated both categorical and physics-informed variables to enhance model learning. Three ML models—Random Forest (RF), LightGBM, and Gaussian Process Regression (GPR)—were trained and evaluated using RMSE, R², and 10-fold cross-validation. The results show that RF consistently outperformed other models, achieving an RMSE of 16.73 mb and R² of 0.99 post-preprocessing. LightGBM also performed robustly, while GPR showed limited stability in sparse or nonlinear regions. Model performance was further analyzed by reaction type and radioisotope. The study highlights the effectiveness of ML and preprocessing in cross-section prediction under data-scarce conditions and suggests future directions including deep learning and hybrid ensemble models.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108357"},"PeriodicalIF":4.4,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634074","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}