Chinese Journal of Physics最新文献_第5页

Measurement of pump light power in NMR co-magnetometer vapor cell based on fitting atomic absorption spectra 基于拟合原子吸收光谱的核磁共振共磁蒸汽池泵浦光功率测量

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-08-12 DOI: 10.1016/j.cjph.2025.08.006

Yan Xu , Rui Wang , Zhen Chai , Jianli Li

{"title":"Measurement of pump light power in NMR co-magnetometer vapor cell based on fitting atomic absorption spectra","authors":"Yan Xu , Rui Wang , Zhen Chai , Jianli Li","doi":"10.1016/j.cjph.2025.08.006","DOIUrl":"10.1016/j.cjph.2025.08.006","url":null,"abstract":"<div><div>We present a method for measuring pump light power in a nuclear magnetic resonance (NMR) co-magnetometer vapor cell using atomic absorption spectra fitting. This approach uniquely quantifies power losses of incident light before and after entering the vapor cell, establishing a pump light power measurement model based on fitting atomic absorption spectra. Fine-tuning the fitting formula enables precise measurements, and experimental validation confirms the model’s accuracy. Results demonstrate a linear variation in light power loss, allowing single-measurement linear calibration of pump light power. This method also determines corrected two-dimensional power density and has been validated across different laser power levels and temperatures, highlighting its versatility and robustness. This approach facilitates investigating the atomic ensemble's state in the NMR co-magnetometer and provides a valuable framework for calculating polarizabilities of alkali metal atoms and inert gases. The method offers significant potential for optimizing performance in atomic sensor applications, advancing precision measurement technologies.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 1090-1100"},"PeriodicalIF":4.6,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144886325","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}

引用次数: 0

Enhancement of Jeffery tri-hybrid nanofluid transport phenomena across a permeable sheet 可渗透薄片上Jeffery三杂化纳米流体输运现象的增强

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-08-12 DOI: 10.1016/j.cjph.2025.07.024

Tharanei Saravanan , Kohilavani Naganthran , N.F.M. Noor , Ioan Pop

{"title":"Enhancement of Jeffery tri-hybrid nanofluid transport phenomena across a permeable sheet","authors":"Tharanei Saravanan , Kohilavani Naganthran , N.F.M. Noor , Ioan Pop","doi":"10.1016/j.cjph.2025.07.024","DOIUrl":"10.1016/j.cjph.2025.07.024","url":null,"abstract":"<div><div>This research examines the effect of a Jeffery tri-hybrid nanofluid on the convective heat transfer in fluid movement over a permeable sheet that stretches or shrinks. The governing Navier-Stokes equations continuity, momentum, and energy are altered according to boundary layer theory and expressed in a solvable format by applying suitable similarity transformations. Numerical solutions obtained with the bvp4c function in MATLAB. The findings indicate that increased suction and dominant viscous dissipation significantly enhance the local Nusselt number, indicating enhanced heat transfer rates. Viscous dissipation also significantly boosts the Nusselt number, surpassing the impact of stretching or shrinking parameters. The non-uniqueness solution reveals that the first solution remains physically stable, indicating steady thermal behaviour, whereas the second solution is unstable due to significant viscoelastic and suction effects. Additionally, the results reveal the existence of a dual (non-unique) solution in the presence of suction, highlighting enhanced flow sensitivity. In contrast, injection yields a unique and stable solution. These research findings can be applied to enhance thermal management in optimising engineering processes, such as extrusion and hot rolling, by selecting appropriate fluids to improve convective heat transfer.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 212-225"},"PeriodicalIF":4.6,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217655","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}

引用次数: 0

Interpretation of conservative Morris-Thorne type topologically charged wormhole models and energy conditions with relativistic corrections 用相对论修正解释保守的Morris-Thorne型拓扑带电虫洞模型和能量条件

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-08-12 DOI: 10.1016/j.cjph.2025.08.011

M. Yousaf , Badr S. Alkahtani , G. Mustafa , S.K. Maurya

{"title":"Interpretation of conservative Morris-Thorne type topologically charged wormhole models and energy conditions with relativistic corrections","authors":"M. Yousaf , Badr S. Alkahtani , G. Mustafa , S.K. Maurya","doi":"10.1016/j.cjph.2025.08.011","DOIUrl":"10.1016/j.cjph.2025.08.011","url":null,"abstract":"<div><div>In this paper, we investigate anisotropic Morris-Thorne-type wormholes with topological charge in the context of <span><math><mi>D</mi></math></span>-dimensional Einstein gravity. We analyze different toy models of wormhole shape functions and examine the role of exotic matter by constructing <span><math><mrow><mn>3</mn><mi>D</mi></mrow></math></span> and <span><math><mrow><mn>2</mn><mi>D</mi></mrow></math></span> embedding diagrams to visualize their geometry. The monopole parameter significantly influences the wormhole throat size and curvature, with higher values resulting in a wider throat and a flatter embedding, affecting both stability and traversability. To evaluate the physical viability of these models, we assess the energy conditions for various wormhole configurations. Our findings indicate that these conditions are not fully satisfied at the throat, confirming the need for exotic matter to sustain the wormhole structure. We also investigate the anisotropy parameter, which measures the difference between radial and tangential pressures, offering insight into internal forces, whether attractive or repulsive, and their impact on the stability of the wormhole. Furthermore, we estimate the amount of exotic matter required using the volume integral quantifier approach within the <span><math><mi>D</mi></math></span>-dimensional modified gravity framework. Our results suggest a minimal amount of exotic matter is needed to maintain traversable wormhole solutions. This work offers valuable theoretical insights into wormhole solutions in higher-dimensional Einstein gravity, contributing to the broader understanding of hypothetical traversable wormholes in modified gravitational theories.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 1255-1284"},"PeriodicalIF":4.6,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921589","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}

引用次数: 0

Resonant flow of a stratified fluid influenced by damping over topography 受地形阻尼影响的层状流体的共振流动

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-08-11 DOI: 10.1016/j.cjph.2025.08.009

Mohammed Daher Albalwi

引用次数: 0

DFT exploration of drug-carrier complex formations along with the combination of Cycloserine (Seromycin) drug and an iron-decorated fullerene 环丝氨酸（丝霉素）药物与铁修饰富勒烯结合时药物载体复合物形成的DFT探索

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-08-10 DOI: 10.1016/j.cjph.2025.08.013

Chou-Yi Hsu , Mahmoud Mirzaei , Radhwan Abdul Kareem , Shoira Formanova

{"title":"DFT exploration of drug-carrier complex formations along with the combination of Cycloserine (Seromycin) drug and an iron-decorated fullerene","authors":"Chou-Yi Hsu , Mahmoud Mirzaei , Radhwan Abdul Kareem , Shoira Formanova","doi":"10.1016/j.cjph.2025.08.013","DOIUrl":"10.1016/j.cjph.2025.08.013","url":null,"abstract":"<div><div>This work was focused on the exploration of drug-carrier complexes formation along with the combination of Cycloserine (Seromycin); so called CYS, drug and an iron-doped fullerene (FUL) with the formula C<sub>19</sub>Fe for engineering a potential drug delivery platform based on density functional theory (DFT) assessments. CYS is an antibiotic with a wide spectrum of applications, in which its enhancement is crucial for approaching efficient medications. To this point, DFT calculations were preformed to study interactions of CYS and FUL along with the formation of CYS@FUL complexes for exploring a suitable carrier for this well-known drug. Accordingly, structural and electronic features were evaluated for the formations of CYS@FUL complexes, in which strengths of adsorptions were obtained within meaningful values from -20 to -39 kcal/mol for four configurations. The existences of O..Fe, N…Fe, C…Fe, O…C, and H…C interactions were found for the formation of CYS@FUL complexes. Moreover, the electronic features indicated the distinguishability of combination and also a managing role of FUL for the future behaviors of adsorbed CYS counterpart. As a consequence, a potential drug delivery platform was proposed by the formation of CYS@FUL complexes using the carrier role of FUL towards the CYS antibiotic drug.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 1101-1109"},"PeriodicalIF":4.6,"publicationDate":"2025-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144889901","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}

引用次数: 0

Dynamic switching of multiple holograms and near-field images enabled by terahertz vanadium dioxide metasurface 利用太赫兹二氧化钒超表面实现多全息图和近场图像的动态切换

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-08-10 DOI: 10.1016/j.cjph.2025.08.004

Chaoxian Tang, Zhiqiang Du, Yijun Fu, Zhengyong Song

{"title":"Dynamic switching of multiple holograms and near-field images enabled by terahertz vanadium dioxide metasurface","authors":"Chaoxian Tang, Zhiqiang Du, Yijun Fu, Zhengyong Song","doi":"10.1016/j.cjph.2025.08.004","DOIUrl":"10.1016/j.cjph.2025.08.004","url":null,"abstract":"<div><div>Metasurface can manipulate electromagnetic wave flexibly due to its subwavelength structure. Hologram and grayscale image (GI) are important topics in optical metasurfaces. Combining hologram with GI has become a feasible method to broaden multiple imaging channels. However, it is a significant challenge to realize multichannel imaging with dynamical switching in the terahertz band. Vanadium dioxide (VO<sub>2</sub>) is a suitable choice to realize dynamic control because of its phase change property. Here, a dynamic metasurface based on VO<sub>2</sub> is designed to generate three holograms and three GIs at 3.75 THz. When VO<sub>2</sub> is metallic, meta-atom manipulates propagation phase and geometric phase by modifying dimension and orientation of VO<sub>2</sub> block. When VO<sub>2</sub> is insulating, meta-atom changes geometric phase by adjusting the orientation of gold block. GI is generated by altering the orientation of meta-atom, while hologram is related to orientation and dimension of meta-atom. Our metasurface realizes two holograms and one GI as VO<sub>2</sub> is metallic, and it presents one hologram and two GIs as VO<sub>2</sub> is insulating. This work may provide the inspiration in optical visualization and imaging encryption.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 1060-1072"},"PeriodicalIF":4.6,"publicationDate":"2025-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144865168","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}

引用次数: 0

Synchronization transitions in delay-coupled phase oscillator networks with higher-order interactions 具有高阶相互作用的延迟耦合相位振荡器网络中的同步跃迁

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-08-09 DOI: 10.1016/j.cjph.2025.07.039

Deivasundari Muthukumar , Atiyeh Bayani , Fahimeh Nazarimehr , Karthikeyan Rajagopal , Gaihui Guo , Sajad Jafari

引用次数: 0

Photoinduced Two-Dimensional Supramolecular Chiral Microstructures with Enhanced Stability 具有增强稳定性的光诱导二维超分子手性微结构

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-08-08 DOI: 10.1016/j.cjph.2025.08.007

Zhi-Qun Wang , Hung-Lin Chen , Yan-Song Zhang , Ting-Shan Mo , Chia-Rong Lee

{"title":"Photoinduced Two-Dimensional Supramolecular Chiral Microstructures with Enhanced Stability","authors":"Zhi-Qun Wang , Hung-Lin Chen , Yan-Song Zhang , Ting-Shan Mo , Chia-Rong Lee","doi":"10.1016/j.cjph.2025.08.007","DOIUrl":"10.1016/j.cjph.2025.08.007","url":null,"abstract":"<div><div>Periodic microstructures are essential for controlling optical and mechanical properties but remain difficult to fabricate with precision and scalability, and conventional methods are costly and rigid. Thus, self-assembling and tunable alternatives are needed. Stimulus-responsive anisotropic soft matter offers a promising solution because it can spontaneously form micro- and nanoscale periodic superstructures with high tunability for functional device design. However, these superstructures rely on a delicate balance of multiple forces, so they are vulnerable to external perturbations and often have a short lifespan, which is a key challenge in the field. This study investigates photoinduced Helfrich deformation in chiral azobenzene-doped cholesteric liquid crystals (CLCs) and compares the resulting microstructures in systems with and without bent-mesogenic dimers. The dimers exhibit an exceptionally low bend elastic constant that governs the resistance of the LC system to bending deformation. During the cis-trans photoisomerization of chiral azobenzene, stress accumulation due to the shortening of the helical pitch, leading to the formation of a two-dimensional supramolecular chiral microstructure. Furthermore, applying an auxiliary voltage lower than the threshold of the electro-induced Helfrich deformation considerably enhances the stability of the microstructure, and the stabilization effect increases in the samples containing dimers. At voltages lower and higher than the threshold, the microstructures eventually transform into a planar state and a hybrid state with fingerprint and focal conic textures, respectively. This study opens a new avenue for expanding the applicability of Helfrich deformation and provides insights into the stability control of periodic microstructures in soft matter physics, providing valuable reference for the fields of optics and photonics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 1149-1159"},"PeriodicalIF":4.6,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908975","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}

引用次数: 0

Ultracompact multi-mode add-drop multiplexer based on pixelated photonic-like crystals 基于像素化光子晶体的超紧凑多模加丢多路复用器

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-08-08 DOI: 10.1016/j.cjph.2025.08.005

Junmin Liu , Chuangxin Xie , Keyin Wen , Zhiwei Guan , Zhibin Wu , Huapeng Ye , George Y. Chen , Ze Dong , Shixiang Xu , Dianyuan Fan , Shuqing Chen

{"title":"Ultracompact multi-mode add-drop multiplexer based on pixelated photonic-like crystals","authors":"Junmin Liu , Chuangxin Xie , Keyin Wen , Zhiwei Guan , Zhibin Wu , Huapeng Ye , George Y. Chen , Ze Dong , Shixiang Xu , Dianyuan Fan , Shuqing Chen","doi":"10.1016/j.cjph.2025.08.005","DOIUrl":"10.1016/j.cjph.2025.08.005","url":null,"abstract":"<div><div>The development of integrated photonic systems necessitates ultracompact multi-mode add-drop multiplexers to enable high-density node interconnection communication. Conventional cascaded directional couplers, however, suffer from prolonged coupling lengths and intermodal crosstalk during the evanescent wave coupling progress, imposing fundamental limits on device miniaturization and multi-mode adiabatic conversion. Here, we propose a groundbreaking single-level mode conversion mechanism enabled by pixelated photonic-like crystals. By leveraging subwavelength-scale dielectric scattering units, we achieve simultaneous mode field confinement and phase compensation, reducing the coupling length by two orders of magnitude (to 3.6 μm × 5.4 μm) while suppressing intermodal interference. Benefiting from this design, we demonstrate an ultracompact mode add-drop multiplexer supporting simultaneous add/drop of 1-3 TE modes with the operation broadband ≥ 38 nm and insertion loss < 4 dB. Furthermore, the devices enable routing of 11.25 Tbit/s QPSK-OFDM signals with bit error rates of 10<sup>-5</sup> at -13.5 dBm. This work verifies the feasibility of on-chip communication interconnection through the single-level mode conversion mechanism, offering a versatile solution for integrated photonic networks with potential extensions to LiDAR, quantum key distribution, and neuromorphic photonics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 1285-1292"},"PeriodicalIF":4.6,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921590","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}

引用次数: 0

Overdamped Brownian dynamics in a potential trap under a nonuniform temperature field 非均匀温度场下势阱中的过阻尼布朗动力学

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2025-08-08 DOI: 10.1016/j.cjph.2025.07.034

Cin-Hua Pan , Pik-Yin Lai

{"title":"Overdamped Brownian dynamics in a potential trap under a nonuniform temperature field","authors":"Cin-Hua Pan , Pik-Yin Lai","doi":"10.1016/j.cjph.2025.07.034","DOIUrl":"10.1016/j.cjph.2025.07.034","url":null,"abstract":"<div><div>We investigate the dynamics and statistics of a one-dimensional Brownian particle in a potential trap under a spatially nonuniform temperature field. For single minimum harmonic or anharmonic trapping potentials and unimodal temperature field, the Brownian particle can be described by a double-well effective potential with an effective barrier, with the effective potential and the steady-state position distribution derived analytically using the Fokker-Planck equation. The transition rate between the two wells in the effective potential is also derived. In addition, the impact of a nonuniform temperature on the escape kinetics in a double-well potential is also considered with the modified transition rate derived analytically, indicating suppression of the energy barrier and hence enhancement of the transition rate between the two wells. Furthermore, it is demonstrated that a tilted double-well effective potential can be obtained by mismatching the centers of the trapping well and the temperature profile, opening the possibility of constructing a memory erasure device in such a system. The nonequilibrium nature due to the temperature gradient is also discussed in terms of the hidden entropy production, as revealed by the corresponding underdamped dynamics. Numerical simulations of the corresponding Langevin dynamics verify all of these theoretical results.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 1316-1327"},"PeriodicalIF":4.6,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996494","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}

引用次数: 0