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Cationic pre-insertion interlayer engineering of manganese dioxide for highly efficient electromagnetic wave absorption

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材料科学技术（英文版） 2025年第3期206卷 297-306页

作者： Yue Zhang Xin Yang Changyi Zheng Jiayue Wen Xingwang Hou Weiping Ye Kunyao Cao Rui Zhao Wenjian Wang Fei Han Weidong Xue School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054PR China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054PR China Tianfu Jiangxi Laboratory Chengdu 610041PR China Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800PR China Institute of Energy Research Jiangxi Academy of SciencesNanchang 330096PR China

Interlayer engineering of two-dimensional structural materials provides unique advantages for tuning the electromagnetic properties of metal oxides,injecting unlimited energy into the design of advanced two-dimensional metal oxide electromagnetic wave *** this study,Manganese dioxide intercalated with alkali metal ions was prepared by a simple molten salt *** pre-intercalation of ions not only enhances the polarization loss at the heterogeneous interface between cations(point sites)and man-ganese dioxide(face sites)but also alters the energy band structure of manganese oxide and enhances its electrical conductivity,which in turn enhances the conductive loss of the manganese *** to the synergistic effect of multiple polarizations and conductive losses,NaMO exhibits superb electromag-netic wave absorption properties and an effective absorption bandwidth of 5.36 GHz at thinner matched *** addition,the RCS simulation result further verifies the excellent electromagnetic wave ab-sorption capability of *** the positive incidence of electromagnetic waves,the electromagnetic wave reflection intensity of the metal plate coated with NaMO is effectively ***,this work establishes a new way to modulate the electromagnetic properties.

关键词： Manganese dioxide Ion intercalation Molten salt method Electromagnetic wave absorption

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Magnetic domain structures in ultrathin Bi_(2)Te_(3)/CrTe_(2) heterostructures

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Chinese physics B 2024年第8期33卷 511-517页

作者：夏体瑞杨笑天张逸凡刘馨琪蔡新雨刘畅姚岐寇煦丰王文波 School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China Department of Materials Science Fudan UniversityShanghai 200438China

Chromium tellurium compounds are important two-dimensional van der Waals ferromagnetic materials with high Curie temperature and chemical stability in air,which is promising for applications in spintronic ***,highquality spin-orbital-torque(SOT)device,Bi_(2)Te_(3)/CrTe_(2)heterostructure was epitaxially grown on Al_(2)O_(3)(0001)*** Hall measurements indicate the existence of strong ferromagnetism in this device with the CrTe_(2)thickness down to 10 *** order to investigate its micromagnetic structure,cryogenic magnetic force microscope(MFM)was utilized to measure the magnetic domain evolutions at various temperatures and magnetic *** virgin domain state of the device shows a worm-like magnetic domain structure with the size around 0.6μm-0.8μ*** irregular-shape magnetic domains(>1μm)can be induced and pinned,after the field is increased to coercive field and ramped back to low *** temperature-dependent MFM signals exhibit a nice mean-field-like ferromagnetic transition with Curie temperature around 201.5 K,indicating a robust ferromagnetic *** a device can be potentially implemented in future magnetic memory technology.

关键词： CrTe_(2) magnetic domain magnetic force microscopy

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Support vector regression-based operational effectiveness evaluation approach to reconnaissance satellite system

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Journal of Systems Engineering and Electronics 2023年第6期34卷 1626-1644页

作者： HAN Chi XIONG Wei XIONG Minghui LIU Zhen College of Aerospace Information Space Engineering UniversityBeijing 101400China Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering UniversityBeijing 101400China

As one of the most important part of weapon system of systems(WSoS),quantitative evaluation of reconnaissance satellite system(RSS)is indispensable during its construction and *** at the problem of nonlinear effectiveness evaluation under small sample conditions,we propose an evaluation method based on support vector regression(SVR)to effectively address the defects of traditional *** the performance of SVR is influenced by the penalty factor,kernel type,and other parameters deeply,the improved grey wolf optimizer(IGWO)is employed for parameter *** the proposed IGWO algorithm,the opposition-based learning strategy is adopted to increase the probability of avoiding the local optima,the mutation operator is used to escape from premature convergence and differential convergence factors are applied to increase the rate of *** experiments of 14 test functions validate the applicability of IGWO algorithm dealing with global *** index system and evaluation method are constructed based on the characteristics of *** validate the proposed IGWO-SVR evaluation method,eight benchmark data sets and combat simulation are employed to estimate the evaluation accuracy,convergence performance and computational *** to the experimental results,the proposed method outperforms several prediction based evaluation methods,verifies the superiority and effectiveness in RSS operational effectiveness evaluation.

关键词： reconnaissance satellite system(RSS) support vector regression(SVR) gray wolf optimizer opposition-based learning parameter optimization effectiveness evaluation

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Axial coordinated iron-nitrogen-carbon as efficient electrocatalysts for hydrogen evolution and oxygen redox reactions

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Chinese Chemical Letters 2025年第1期36卷 637-642页

作者： Yanan Zhou Li Sheng Lanlan Chen Wenhua Zhang Jinlong Yang School of Material Science and Chemical Engineering Institute of Mass SpectrometryNingbo UniversityNingbo 315211China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Department of Material Science and Engineering University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy Conversion and Synergetic Innovation Centre of Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China

Designing highly active electrocatalysts for the hydrogen evolution reaction(HER)and oxygen evolution and reduction reactions(OER and ORR)is pivotal to renewable energy ***,based on density functional theory(DFT)calculations,we systematically investigate the catalytic activity of iron-nitrogen-carbon based covalent organic frameworks(COF)monolayers with axially coordinated ligands(denotes as Fe N_(4)-X@COF,X refers to axial ligand,X=-SCN,-I,-H,-SH,-NO_(2),-Br,-ClO,-Cl,-HCO_(3),-NO,-ClO_(2),-OH,-CN and-F).The calculated results demonstrate that all the catalysts possess good thermodynamic and electrochemical *** different ligands axially ligated to the Fe active center could induce changes in the charge of the Fe center,which further regulates the interaction strength between intermediates and catalysts that governs the catalytic ***,FeN_(4)-SH@COF and Fe N_(4)-OH@COF are efficient bifunctional catalysts for HER and OER,FeN_(4)-OH@COF and FeN_(4)-I@COF are promising bifunctional catalysts for OER and *** findings not only reveal promising bifunctional HER/OER and OER/ORR catalysts but also provide theoretical guidance for designing optimum ironnitrogen-carbon based catalysts.

关键词： Axial coordinated ligands DFT calculation Hydrogen evolution reaction Oxygen evolution reaction Oxygen reduction reaction

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Measurement of the neutron total cross section of^(9)Be at the Back-n white neutron source of CSNS

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Chinese physics C 2024年第8期48卷 140-152页

作者： Jiangbo Bai Jingyu Tang Liqun Shi Yonghao Chen Han Yi Jie Bao Yu Bao Ping Cao Haolei Chen Zhen Chen Zengqi Cui Ruirui Fan Changqing Feng Keqing Gao Xiaolong Gao MinHao Gu Changcai Han Guozhu He Yongcheng He Yang Hong Yiwei Hu Hanxiong Huang Xiru Huang Haoyu Jiang Wei Jiang Zhijie Jiang Hantao Jing Ling Kang Bo Li Chao Li Jiawen Li Qiang Li Xiao Li Yang Li Jie Liu Shubin Liu Ze Long Guangyuan Luan Changjun Ning Mengchen Niu Binbin Qi Jie Ren Xichao Ruan Zhaohui Song Kang Sun Zhijia Sun Zhixin Tan Xinyi Tang Binbin Tian Lijiao Wang Pengcheng Wang Zhaohui Wang Xiaoguang Wu Xuan Wu Likun Xie Xiaoyun Yang Li Yu Tao Yu Yongji Yu Guohui Zhang Linhao Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Luping Zhou Zhihao Zhou Kejun Zhu Institute of Modern Physics Fudan UniversityShanghai 200433China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Sate Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

The neutron total cross section data of^(9)Be are essential in the nuclear structure model research of light nuclei and nuclear power *** neutron total cross section of^(9)Be in the 0.3 eV−120 MeV energy region has been measured using time-of-flight and transmission methods with the Neutron Total Cross Sectional Spectrometer(NTOX)based on the multi-cell fast fission chamber at the China Spallation Neutron Source(CSNS)-Back-n white neutron source(Back-n).The fission count-neutron energy distributions of ^(235)U and ^(238)U without samples and with Be samples with three thicknesses were measured in the double-bunch operation mode for a beam power of 100 *** Bayesian method was used to eliminate the influence of the double-bunch problem on neutron measurement in the energy region above 10 *** neutron total cross section of^(9)Be results was consistent with ENDF/B-VIII.0 evaluation library data in the 0.3 eV−20 MeV energy *** the energy ranges of 0.3 eV to 10 keV and 0.01 to 20 MeV,the deviations between our results and the evaluation results of ENDF/B-VIII.0 were within 2.5%and 15%,*** the resonance energy region,the measured resonance energies in our experiment were 0.63,0.82,and 2.8 MeV,*** results showed that the total cross section uncertainties of three Be samples were within 2.2%in the energy region below 1 *** total cross section uncertainty of 30 mm Be from ^(235)U was the smallest and less than 5%in the energy region of 0.3 eV−120 *** results of this experiment can provide technical support for further data analysis and related nuclear data evaluation.

关键词： ^(9)Be neutron total cross section CSNS Back-n time-of-flight method transmission method multi-cell fast fission chamber

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Dipolar Bose gas with SU(3)spin-orbit coupling held under a toroidal trap

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Frontiers of physics 2025年第2期20卷 191-200页

作者： Fang Wang Jia Liu Si-Lin Chen Lin Wen Xue-Ying Yang Xiao-Fei Zhang School of Physics&Information Science Shaanxi University of Science and TechnologyXi’an 710021China Shaanxi Key Laboratory for Theoretical Physics Frontiers Institute of Modern PhysicsNorthwest UniversityXi’an 710127China College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 400047China College of Sciences National University of Defense TechnologyChangsha 410073China

We consider a dipolar spin-1 Bose gas with SU(3)spin-orbit coupling trapped in a two-dimensional toroidal *** to the combined effects of SU(3)spin-orbit coupling,dipole-dipole interaction,and spin-exchange interaction,the system exhibits a rich variety of ground-state phases and topological defects,including modified stripe,azimuthal distributed petal and triangular lattice,double-quantum spin vortices,and so *** particular,by studying the spin texture of such a system,it is found that the formation and transformation between meron and skyrmion topological spin textures can be realized by a choice of dipole-dipole interaction,SU(3)spin-orbit coupling,and spin-exchange *** also give an experimental protocol to observe such novel states within current experimental capacity.

关键词： Bose-Einstein condensate spin-orbit coupling dipolar condensate quantum vortex

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Novel transmission property of zero-index metamaterial waveguide doped with gain and lossy defects

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Chinese physics B 2023年第10期32卷 531-536页

作者：朱琼干柴立臣路海 Department of Science Taiyuan Institute of TechnologyTaiyuan 030008China Engineering Laboratory for Optoelectronic Technology and Advanced Manufacturing School of PhysicsHenan Normal UniversityXinxiang 453007China

Taking inspiration from quantum parity–time(PT) symmetries that have gained immense popularity in the emerging fields of non-Hermitian optics and photonics, the interest of exploring more generalized gain-loss interactions is never seen down. In this paper we theoretically present new fantastic properties through a zero-index metamaterial(ZIM) waveguide loaded gain and loss defects. For the case of epsilon-and-mu-near-zero(EMNZ) based ZIM medium, electromagnetic(EM)waves are cumulative and the system behaves as an amplifier when the loss cavity coefficient is greater than the gain cavity coefficient. Conversely, when loss is less than gain, EM waves are dissipated and the system behaves as an ***, our investigation is extended to non-Hermitian scenarios characterized by tailored distributions of gain and loss in the epsilon-near-zero(ENZ) host medium. The transport effect in ZIM waveguide is amplified in one mode, while it is dissipative in the other mode, which breaks the common sense and its physic is analyzed by magnetic flux. That is which cavity has the smaller loss/gain coefficient, the larger its magnetic flux, which cavity dominates. This paper is of significant importance in the manipulation of electromagnetic waves and light amplification as well as the enhancement of matter interactions.

关键词： zero-index metamaterial non-Hermitian gain-loss interaction magnetic flux

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Color-conversion displays:current status and future outlook

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Light(science & Applications) 2024年第12期13卷 2941-2961页

作者： Guijun Li Man-Chun Tseng Yu Chen Fion Sze-Yan Yeung Hangyu He Yuechu Cheng Junhu Cai Enguo Chen Hoi-Sing Kwok Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Advanced Displays and Optoelectronics Technologies Department of Electronic and Computer EngineeringThe Hong Kong University of Science and TechnologyHong KongChina National and Local United Engineering Laboratory of Flat Panel Display Technology College of Physics and Information EngineeringFuzhou UniversityCollege of Physics and Information Engineering 350108FuzhouChina Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

The growing focus on enhancing color quality in liquid crystal displays(LCDs)and organic light-emitting diodes(OLEDs)has spurred significant advancements in color-conversion ***,color conversion is also important for the development and commercialization of *** article provides a comprehensive review of different types of color conversion methods as well as different types of color conversion *** summarize the current status of patterning process,and discuss key strategies to enhance display ***,we speculate on the future prospects and roles that color conversion will play in ultra-high-definition micro-and projection displays.

关键词： materials projection outlook

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Out-of-plane weak ferromagnetism at room temperature in lattice-distortion non-collinear antiferromagnet of single-crystal Mn_(3)Sn

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Chinese physics B 2023年第8期32卷 428-432页

作者：张博熙宋平邓珊珊娄理姚森 State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China

Out-of-plane weak ferromagnetic(OWFM)spin arrangements with topological properties can realize a series of interesting physical ***,this spin structure tends to exist at low *** OWFM structure can also be induced at room temperature by hydrostatic pressure,whereas this isotropic approach tends to form helical AFM *** report the OWFM spin arrangement in single crystal Mn_(3)Sn by an anisotropic strategy of high-stressconstrained compression deformation at room *** experimental and theoretical simulation results show that the alignment of the OWFM spin structure is due to the distortion of the atomic scale caused by the strain energy during *** OWFM spin arrangement can significantly change the magnetic property of Mn_(3)*** a result,the remanent magnetization M_(r)for the deformed sample(0.056μ_(B)/f.u.)is about eleven times that for the pre-deformed sample(0.005μ_(B)/f.u.),and the coercivity(H_(c))increases from 0 k Oe(pre-deformed sample)to 6.02 k Oe(deformed sample).Our findings provide a way to generate the OWFM spin structure at room temperature and may give fresh ideas for creating antiferromagnetic materials with excellent physical properties.

关键词： non-collinear antiferromagnet high-stress-constrained compression deformation lattice distortion

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Raman-type absolute atom gravimeter assisted by a degenerate optical cavity

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Physical Review A 2025年第2期111卷 L021303-L021303页

作者： Liang Yuan Bin Chen Yu-Hang Li Chen Yao Sheng-Jun Yang Shenzhen Institute for Quantum Science and Engineering School of Science Southern University of Science and Technology Shenzhen Guangdong 518055 China Department of Physics School of Science Southern University of Science and Technology Shenzhen Guangdong 518055 China International Quantum Academy Shenzhen Guangdong 518048 China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen Guangdong 518055 China

Cavity-assisted atom interferometry has been proposed for gravity measurement in the past decade due to its promising advantages such as low laser power consumption, high beam quality, and strong atom-photon interactions. However, the previous cavity-related works have difficulties measuring the absolute gravitational acceleration g due to their limited cavity design and locking methods. We experimentally demonstrate a Raman-type absolute atom gravimeter assisted by a newly designed degenerate optical cavity. The gravimeter achieves a decent sensitivity of about 28.5(9)×10−8gHz−1/2 under our noisy laboratory conditions and without magnetic shielding of the atom interference area. The accuracy reaches 20 µGal within half an hour of continuous measurement. We also systematically measure and analyze the main noises affecting the g-measure sensitivity, indicating no physical obstacles to achieving higher sensitivity. Our cavity scheme is compatible and can be easily integrated with current free-space atom interferometers. By fully utilizing the cavity's advantages, it will benefit many areas in future fundamental research and fieldable applications.

关键词： Gravimeters

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