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Anomalous displacement reaction for synthesizing above-room-temperature and air-stable vdW ferromagnet PtTe2Ge1/3

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National Science Review 2023年第1期10卷 236-245页

作者： Wenxuan Zhu Cheng Song Qian Wang Hua Bai Siqi Yin Feng Pan Key Laboratory of Advanced Materials School of Materials Science and Engineering Beijing Innovation Center for Future Chips Tsinghua University

Emerging van der Waals（vdW） magnets provide a paradise for the exploration of magnetism in the ultimate two-dimensional（2D） limit,and the construction of integrated spintronic devices,and have become a research frontier in the field of low-dimensional *** date,prototypical vdW magnets based on metals of the first transition series（e.g.V,Cr,Mn and Fe） and chalcogen elements suffer from rapid oxidation restricted by the Hard-Soft-Acid-Base principle,as well as low Curie temperatures（TC）,which has become a generally admitted challenge in 2D ***,starting from air-unstable Cr2Ge2Te6vdW thin flakes,we synthesize Ge-embedded PtTe2(namely PtTe2Ge1/3) with superior air stability,through the displacement reaction in the Cr2Ge2Te6/Pt *** this process,the anomalous substitution of Cr with Pt in the thermal diffusion is inverse to the metal activity order,which can be attributed to the compatibility between soft-acid（Pt） and soft-base（Te） ***,the layered uniform insertion of Ge unbalances Pt-Te bonds and introduces long-range ordered ferromagnetism with perpendicular magnetic anisotropy and a Curie temperature above room *** work demonstrates the anti-metal-activity-order reaction tendency unique in 2D transition-metal magnets and boosts progress towards practical 2D spintronics.

关键词： vdW magnets room-temperature ferromagnetism air stability HSAB PtTe2Ge1/3

Memristive dynamics enabled neuromorphic computing systems

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Science China(Information Sciences) 2023年第10期66卷 5-19页

作者： Bonan YAN Yuchao YANG Ru HUANG center for Brain Inspired chips Institute for Artificial Intelligence Peking University Beijing Advanced Innovation center for Integrated Circuits School of Integrated Circuits Peking University School of Electronic and Computer Engineering Peking University center for Brain Inspired Intelligence Chinese Institute for Brain Research(CIBR)

The slowing down of transistor scaling and explosive growth for intelligence computing power emerge as the two driving factors for the study of novel devices and materials to pursue highly-efficient computing systems. Memristors, incorporating rich intrinsic dynamics, are a promising candidate for constructing efficient and scalable bio-inspired computing systems. In this progress report, we review the latest advances in novel types of memristors as well as their applications in implementing neuromorphic computing systems. This paper not only covers the memristive dynamics-enabled bionic computing systems but also discusses the memristive sensory systems that integrate sensing and computing. Eventually, device-circuit co-optimization methods are given to emphasize the trend of cross-layer co-design in this fast-evolving *** innovation in memristor devices mainly focuses on specialized computing hardware and yields superior computing and sensing efficiency. At last, we offer our insight into the trend of state-of-the-art research in memristive materials, devices, circuits, and systems.

关键词： memrsitor memristive dynamics artificial synapse artificial neuron neuromorphic computing

High-performance magnesium-based thermoelectric materials:Progress and challenges

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Journal of Magnesium and Alloys 2022年第7期10卷 1719-1736页

作者： Zizhen Zhou Guang Han Xu Lu Guoyu Wang Xiaoyuan Zhou center of Quantum Materials and devices College of PhysicsChongqing UniversityChongqing 401331PR China National Engineering research center for Magnesium Alloys Chongqing UniversityChongqing 400044PR China Chongqing Institute of Green and intelligent Technology Chinese Academy of SciencesChongqing 400714PR China Analytical and Testing center Chongqing UniversityChongqing 401331PR China

Magnesium-based materials have been regarded as promising candidates for large-scale,high-efficiency thermoelectric applications,owing to their excellent dimensionless figure of merit,high abundance,and low *** this review,we comprehensively summarize the recent advances of Mg-based thermoelectrics,including Mg_(2)X(X=Si,Ge,Sn),Mg3(Sb,Bi)_(2),andα-MgAgSb,from both material and device *** electrical and thermal transport properties are first elucidated based on the crystallographic characteristics,band structures,and phonon *** then review the optimization strategies towards higher thermoelectric performance,as well as the device applications of Mg-based thermoelectric materials and the related engineering *** highlighting the challenges and possible solutions in the end,this review intends to offer perspectives on the future research work to further enhance the performance of Mg-based materials for practical applications.

关键词： Thermoelectric Mg-based materials Mg_(2)(Si,Ge,Sn) Mg_(3)Sb_(2) MgAgSb Thermoelectric device

Fortifying Smart Grids: A Holistic Assessment Strategy against Cyber Attacks and Physical Threats for intelligent Electronic devices

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Computers, Materials & Continua 2024年第8期80卷 2579-2609页

作者： Yangrong Chen June Li Yu Xia Ruiwen Zhang Lingling Li Xiaoyu Li Lin Ge School of Computer Science Zhengzhou University of AeronauticsZhengzhou450046China Henan Xin’an Century Technology Co. Ltd.Henan Data Security Engineering Technology Research CenterZhengzhou450046China Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of EducationSchool of Cyber Science and EngineeringWuhan UniversityWuhan430072China

intelligent electronic devices(IEDs)are interconnected via communication networks and play pivotal roles in transmitting grid-related operational data and executing control *** the context of the heightened security challenges within smart grids,IEDs pose significant risks due to inherent hardware and software vulner-abilities,as well as the openness and vulnerability of communication *** grid security,distinct from traditional internet security,mainly relies on monitoring network security events at the platform layer,lacking an effective assessment mechanism for ***,we incorporate considerations for both cyber-attacks and physical faults,presenting security assessment indicators and methods specifically tailored for ***,we outline the security monitoring technology for IEDs,considering the necessary data sources for their security ***,we classify IEDs and establish a comprehensive security monitoring index system,incorporating factors such as running states,network traffic,and abnormal *** index system contains 18 indicators in 3 ***,we elucidate quantitative methods for various indicators and propose a hybrid security assessment method known as GRCW-hybrid,combining grey relational analysis(GRA),analytic hierarchy process(AHP),and entropy weight method(EWM).According to the proposed assessment method,the security risk level of IEDs can be graded into 6 levels,namely 0,1,2,3,4,and *** higher the level,the greater the security ***,we assess and simulate 15 scenarios in 3 categories,which are based on monitoring indicators and real-world situations encountered by *** results show that calculated security risk level based on the proposed assessment method are consistent with actual ***,the reasonableness and effectiveness of the proposed index system and assessment method are validated.

关键词： Smart grid intelligent electronic device security assessment abnormal behaviors network traffic running states

Fluorescence emission difference microscopy based on polarization modulation

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Journal of Innovative Optical Health Sciences 2022年第5期15卷 83-94页

作者： Wanjie Dong Yuran Huang Zhimin Zhang Liang Xu Cuifang Kuang Xiang Hao Xu Liu State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou 310027P.R.China research center for intelligent chips and devices Zhejiang Lab Hangzhou 311121P.R.China Ningbo research Institute Zhejiang University NingboZhejiang 315100P.R.China Collaborative Innovation center of Extreme Optics Shanxi University Taiyuan 030006P.R.China State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua UniversityBeijing 100084P.R.China

In this paper,we propose a new fluorescence emission difference microscopy(FED)technique based on polarization *** electro-optical modulator(EOM)is used to switch the excitation beam between the horizontal and vertical polarization states at a high frequency,which leads to solid-and donut-shaped beams after spatial light *** on the fluorescent nanoparticles demonstrates that the proposed method can achieve~λ=4 spatial *** the proposed system,the dynamic imaging of subcellular structures in living cells over time is achieved.

关键词： Super-resolution fluorescence emission difference microscopy electro-optical modulator polarization modulation

Mapping wind by the first-order Bragg scattering of broad-beam high-frequency radar

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Acta Oceanologica Sinica 2021年第3期40卷 153-166页

作者： Yuming Zeng Hao Zhou Zhen Tian Biyang Wen School of Electronic Information Wuhan UniversityWuhan 430072China research center for intelligent chips Zhejiang LabHangzhou 311121China

Mapping wind with high-frequency(HF)radar is still a *** existing second-order spectrum based wind speed extraction method has the problems of short detection distances and low angular resolution for broadbeam HF *** solve these problems,we turn to the first-order Bragg spectrum power and propose a space recursion method to map surface *** month of radar and buoy data are processed to build a wind spreading function model and a first-order spectrum power model describing the relationship between the maximum of first-order spectrum power and wind speed in different sea *** on the theoretical propagation attenuation model,the propagation attenuation is calculated approximately by the wind speed in the previous range cell to compensate for the first-order spectrum in the current range-azimuth *** using the compensated first-order spectrum,the final wind speed is extracted in each *** first-order spectrum and wind spreading function models are tested using one month of buoy data,which illustrates the applicability of the two *** final wind vector map demonstrates the potential of the method.

关键词： high-frequency radar first-order Bragg peak broad-beam wind field wind speed

Direct laser writing breaking diffraction barrier based on two-focus parallel peripheralphotoinhibition lithography

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Advanced Photonics 2022年第5期4卷 56-63页

作者： Dazhao Zhu Liang Xu Chenliang Ding Zhenyao Yang Yiwei Qiu Chun Cao Hongyang He Jiawei Chen Mengbo Tang Lanxin Zhan Xiaoyi Zhang Qiuyuan Sun Chengpeng Ma Zhen Wei Wenjie Liu Xiang Fu Cuifang Kuang Haifeng Li Xu Liu Zhejiang Lab Research Center for Intelligent Chips and DevicesHangzhouChina Zhejiang University College of Optical Science and EngineeringState Key Laboratory of Modern Optical InstrumentationHangzhouChina Zhejiang University College of Control Science and EngineeringState Key Laboratory of Industrial Control TechnologyHangzhouChina Zhejiang Lab Research Center for Humanoid SensingZhejiang LabHangzhouChina

Direct laser writing(DLW)enables arbitrary three-dimensional ***,the diffraction limit poses a major obstacle for realizing nanometer-scale ***,it is challenging to improve the fabrication efficiency using the currently prevalent single-focal-spot systems,which cannot perform high-throughput *** overcome these challenges,a parallel peripheral-photoinhibition lithography system with a sub-40-nm two-dimensional feature size and a sub-20-nm suspended line width was developed in our study,based on two-photon polymerization *** lithography efficiency of the developed system is twice that of conventional systems for both uniform and complex *** proposed system facilitates the realization of portable DLW with a higher resolution and throughput.

关键词： optical fabrication parallel direct laser writing peripheral-photoinhibition diffraction barrier breaking

Complete photonic bandgap in silicon nitride slab assisted by effective index difference between polarizations

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Frontiers of Optoelectronics 2022年第2期15卷 65-71页

作者： Can Ma Jin Hou Chunyong Yang Ming Shi Shaoping Chen Hubei Key Laboratory of intelligent Wireless Communications Hubei Engineering Research Center for Intelligent Internet of ThingsCollege of Electronic and Information EngineeringSouth-Central MinZu UniversityWuhan 430074China

The slab effective index difference between the transverse-electric(TE)and transverse-magnetic(TM)polarizations was utilized to obtain complete photonic bandgap(CPBG)in a silicon nitride(Si_(x)N_(y))photonic crystal *** this,coincident frequency range in the TE photonic bandgap(PBG)and TM PBG,which denotes the CPBGs of the slab,must be found with the same *** adjusting the effective index pair of TE and TM polarizations by changing the thickness of the Si_(x)N_(y)core layer,and also optimizing the structure parameters within the photonic crystal plane,a large normalized CPBG of 5.62%was theoretically obtained in a slab of Si_(x)N_(y)with a refractive index of ***,based on the obtained CPBG,a microcavity which could support both TE and TM polarization was theoretically *** cavity modes for different polarizations were both well confined,which proved the reliability of the *** addition,using the same method,the lowest refractive index of Si_(x)N_(y)on silica slab for a CPBG could be extended to as low as *** results indicate that there is potential for development of various high-performance CPBG devices based on Si_(x)N_(y)slab technology.

关键词： Silicon nitride slab Complete photonic bandgap(CPBG) Microcavity Slab device

Linear magnetoresistance and structural distortion in layered SrCu_(4-x)P_(2) single crystals

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Chinese Physics B 2024年第1期33卷 591-594页

作者：聂勇陈正韦文森李慧杰张勇梅明王园园宋文海宋东升王钊胜朱相德宁伟田明亮 Anhui Key Laboratory of Low-energy Quantum Materials and devices High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefei 230031China Department of Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China Information Materials and intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China School of Physics Anhui UniversityHefei 230601China

We report a systematic study on layered metal SrCu_(4-x)P_(2) single crystals via transport, magnetization, thermodynamic measurements and structural characterization. We find that the crystals show large linear magnetoresistance without any sign of saturation with a magnetic field up to 30T. We also observe a phase transition with significant anomalies in resistivity and heat capacity at T_(p)~140 K. Thermal expansion measurement reveals a subtle lattice parameter variation near Tp, i.e.,?L_(c)/L_(c)~0.062%. The structural characterization confines that there is no structure transition below and above T_(p). All these results suggest that the nonmagnetic transition of SrCu_(4-x)P_(2) could be associated with structural distortion.

关键词： linear magnetoresistance thermal expansion specific heat structural distortion