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Memristive switching in the surface of a charge-density-wave topological semimetal

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Science Bulletin 2024年第13期69卷 2042-2049页

作者： Jianwen Ma Xianghao Meng Binhua Zhang Yuxiang Wang Yicheng Mou Wenting Lin Yannan Dai Luqiu Chen Haonan Wang Haoqi Wu Jiaming Gu Jiayu Wang Yuhan Du Chunsen Liu Wu Shi Zhenzhong Yang bobo tian Lin Miao Peng Zhou Chun-Gang Duan Changsong Xu Xiang Yuan Cheng Zhang State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200241China Key Laboratory of Computational Physical Sciences(Ministry of Education) Institute of Computational Physical SciencesState Key Laboratory of Surface PhysicsDepartment of PhysicsFudan UniversityShanghai 200433China Shanghai Qi Zhi Institute Shanghai 200030China School of Physics Southeast UniversityNanjing 211189China Key Laboratory of Polar Materials and Devices(Ministry of Education) Department of ElectronicsEast China Normal UniversityShanghai 200241China Shanghai Center of Brain–inspired Intelligent Materials and Devices East China Normal UniversityShanghai 200241China State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China Frontier Institute of Chip and System Fudan UniversityShanghai 200433China Zhangjiang Fudan International Innovation Center Fudan UniversityShanghai 201210China School of Physics and Electronic Science East China Normal UniversityShanghai 200241China

Owing to the outstanding properties provided by nontrivial band topology,topological phases of matter are considered as a promising platform towards low-dissipation electronics,efficient spin-charge conversion,and topological quantum *** ferroelectricity in topological materials enables the non-volatile control of the quantum states,which could greatly facilitate topological electronic ***,ferroelectricity is generally incompatible with systems featuring metallicity due to the screening effect of free *** this study,we report the observation of memristive switching based on the ferroelectric surface state of a topological semimetal(TaSe_(4))*** find that the surface state of(TaSe_(4))2I presents out-of-plane ferroelectric polarization due to surface *** the combination of ferroelectric surface and charge-density-wave-gapped bulk states,an electric-switchable barrier height can be achieved in(TaSe_(4))2I-metal *** employing a multi-terminal-grounding design,we manage to construct a prototype ferroelectric memristor based on(TaSe_(4))2I with on/off ratio up to 103,endurance over 103 cycles,and good retention *** origin of the ferroelectric surface state is further investigated by first-principles calculations,which reveal an interplay between ferroelectricity and band *** emergence of ferroelectricity in(TaSe_(4))2I not only demonstrates it as a rare but essential case of ferroelectric topological materials,but also opens new routes towards the implementation of topological materials in functional electronic devices.

关键词： Topological semimetal Schottky barrier Surface ferroelectricity Memristor

Retinomorphic hardware for in-sensor computing

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InfoMat 2023年第9期5卷 1-25页

作者： Guangdi Feng Xiaoxu Zhang bobo tian Chungang Duan Key Laboratory of Polar Materials and Devices(MOE) Ministry of EducationShanghai Center of Brain-inspired Intelligent Materials and DevicesDepartment of ElectronicsEast China Normal UniversityShanghaithe People's Republic of China Zhejiang Lab Hangzhouthe People's Republic of China Collaborative Innovation Center of Extreme Optics Shanxi UniversityShanxithe People's Republic of China

Rapid developments in the Internet of Things and Artificial Intelligence trigger higher requirements for image perception and learning of external environments through visual ***,limited by von Neumann's bottleneck,the physical separation of sense,memory,and processing units in a conventional personal computer-based vision system tend to consume a significant amount of energy,time latency,and additional hardware *** integrating computational tasks of multiple functionalities into the sensors themselves,the emerging bio-inspired neuromorphic visual systems provide an opportunity to overcome these *** high speed,ultralow power and strong adaptability,it is highly desirable to develop a neuromorphic vision system that is based on highly precise in-sensor computing devices,namely retinomorphic *** here present a timely review of retinomorphic devices for visual in-sensor *** begin with several types of physical mechanisms of photoelectric sensors that can be constructed for artificial *** potential applications of retinomorphic hardware are,thereafter,thoroughly *** also highlight the possible strategies to existing challenges and give a brief perspective of retinomorphic architecture for in-sensor computing.

关键词： ferroelectric in-sensor computing photogating retinomorphic device

Research progress on 2D ferroelectric and ferrovalley materials and their neuromorphic application

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Science China(Physics,Mechanics & Astronomy) 2023年第11期66卷 55-76页

作者： Yifan Tan Junding Zheng Xuezhong Niu Yifeng Zhao Ni Zhong bobo tian Chungang Duan Key Laboratory of Polar Materials and Devices Ministry of EducationShanghai Center of Brain-inspired Intelligent Materials and DevicesDepartment of ElectronicsEast China Normal UniversityShanghai200241China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan030006China

Two-dimensional(2D)ferroelectric and ferrovalley materials have recently received extensive attention due to their significant advantages for modern electronic devices,such as miniaturization,low-dissipation,non-volatility,and *** interestingly,the couplings between the ferroic orders in these materials have enriched the development of intelligent devices,especially in neuromorphic *** this paper,the research progress of 2D ferroelectric and ferrovalley materials is introduced and the coupling effects between them are also ***,we briefly introduce recent neuromorphic computing reports based on 2D ferroelectric materials and give perspectives on ferrovalley neuromorphic devices.

关键词： two-dimensional materials ferroelectric materials multiferroic coupling neuromorphic application

Associative learning of a three-terminal memristor network for digits recognition

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Science China(Information Sciences) 2023年第2期66卷 209-218页

作者： Yiming REN bobo tian Mengge YAN Guangdi FENG Bin GAO Fangyu YUE Hui PENG Xiaodong TANG Qiuxiang ZHU Junhao CHU Chungang DUAN Key Laboratory of Polar Materials and Devices (MOE) Ministry of Education Department of ElectronicsEast China Normal University Zhejiang Lab Institute of Microelectronics Beijing Innovation Center for Future Chips (ICFC) Tsinghua University Collaborative Innovation Center of Extreme Optics Shanxi University

Imitating the associative intelligence of the biological brain is attractive but is poorly achieved in hardware because the complex tunable connection in neural networks is difficult to reproduce. We develop a circuit composed of a three-terminal memristor network to reproduce the biological conditioning process artificially. The synaptic weight between co-firing neurons is strengthened simultaneously by generating a feedback signal from the integrate-and-fire neuron to the gate of the synaptic memristor. The network allows the multi-associative capacity of recalling more than one digit in one circuit. Both single and multi-associative learning for recalling digital images are achieved. Furthermore, all 10 digital images from “0” to “9” are successfully recalled in an associative network with such paralleling circuits. Assisted by this associative layer, a typical classification network effectively improves the recognition rate for fragmentary digital *** work sheds light on brain-inspired artificial associative memory and provides a strategy for applications,such as object recognition with partial features and similar scenes.

关键词： artificial intelligence associative learning memristor classification network

磁有序CoH_(2)SeO_(4)薄片中的室温铁电性

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Science China Materials 2024年第5期67卷 1654-1660页

作者：陈璐秋余冰沈阳刘逸飞王号南冯光迪朱秋香罗卫东刘俊明万建国赵庆彪田博博褚君浩段纯刚 Key Laboratory of Polar Materials and Devices(MOE) Shanghai Center of Brain-inspired Intelligent Materials and Devicesand Department of ElectronicsEast China Normal UniversityShanghai200241China Zhejiang Lab Hangzhou310000China Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures Nanjing UniversityNanjing210093China Key Laboratory of Artificial Structures and Quantum Control School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai200240China School of Chemistry and Environmental Engineering Wuhan Institute of TechnologyWuhan430205China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai200083China Institute of Optoelectronics Fudan UniversityShanghai200433China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan030006China

本文通过第一性原理计算和实验表征证明了二维CoH_(2)SeO_(4)薄膜的磁有序和滑移铁电性.首先,实验结果证实了粉末CoH_(2)SeO_(4)样品的反铁磁序.同时,第一性原理计算表明单层CoH_(2)SeO_(4)具有反铁磁(AFM-I)基态(TN≈75 K),且预测了二... 详细信息

本文通过第一性原理计算和实验表征证明了二维CoH_(2)SeO_(4)薄膜的磁有序和滑移铁电性.首先,实验结果证实了粉末CoH_(2)SeO_(4)样品的反铁磁序.同时,第一性原理计算表明单层CoH_(2)SeO_(4)具有反铁磁(AFM-I)基态(TN≈75 K),且预测了二维CoH_(2)SeO_(4)薄膜具有以不对称的三重势阱态为特征的滑移铁电性,并在实验中测得了180°压电滞回线、可反转铁电畴和二次谐波信号.此外,在基于二维CoH_(2)SeO_(4)薄膜的电容器中获得铁电材料所特有的电滞回线和蝴蝶状的电容曲线.介电温谱测试表明二维CoH_(2)SeO_(4)薄膜的铁电转变温度约为370 ***_(2)SeO_(4)中滑移铁电性和反铁磁性的出现为获得低维多铁材料指出了一条新的途径.

关键词： two-dimensional materials sliding ferroelectricity multiferroic materials

Preparation of La0.67Ca0.23Sr0.1MnO3 thin films with interesting electrical and magnetic properties via pulsed-laser deposition

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Science China(Physics,Mechanics & Astronomy) 2017年第2期60卷 72-75页

作者： Shuai Xue XiaoLin Zhao JianLu Wang bobo tian Hai Huang CaiMin Meng Lan Liu Lei Ye JingLan Sun XiangJian Meng XiaoDong Zhang JunHao Chu Department of Applied Physics Donghua University Shanghai 201620 China National Laboratory for Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China University of Chinese Academy of Sciences Beijing 100049 China Department of Electronics Engineering The Chinese University of Hong Kong Hong Kong China School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China

Manganese oxides with a perovskite-type Re_(1-x)D_xMnO_3(Re:heavy rare-earth elements,D:divalent alkali metal)structure have attracted interest because of the complex interaction between their electrons,lattices,and spins[1-5].Generally,manganese oxides with the structure Re_(1-x)D_xMnO_3 have special *** example,the half-metallic manganites,such as La_(2/3)Sr_(1/3)MnO_3 and La_(2/3)Ca_(1/3)MnO_3,wherein the conduction electrons are completely spin polarized。

关键词： La2/3Ca1/3MnO3 沉积薄膜脉冲激光磁学性能钙钛矿型锰氧化物制备电学自旋极化

In-situ artificial retina with all-in-one reconfigurable photomemristor networks

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npj Flexible Electronics 2023年第1期7卷 265-273页

作者： Yichen Cai Yizhou Jiang Chenxu Sheng Zhiyong Wu Luqiu Chen bobo tian Chungang Duan Shisheng Xiong Yiqiang Zhan Chunxiao Cong Zhi-Jun Qiu Yajie Qin Ran Liu Laigui Hu School of Information Science and Technology Fudan UniversityShanghai 200433China Key Laboratory of Polar Materials and Devices(MOE) Department of ElectronicsEast China Normal UniversityShanghai 200241China Yiwu Research Institute of Fudan University Yiwu CityZhejiang 322000China

Despite that in-sensor processing has been proposed to remove the latency and energy consumption during the inevitable data transfer between spatial-separated sensors,memories and processors in traditional computer vision,its hardware implementation for artificial neural networks(ANNs)with all-in-one device arrays remains a challenge,especially for organic-based *** the advantages of biocompatibility,low cost,easy fabrication and flexibility,here we implement a self-powered in-sensor ANN using molecular ferroelectric(MF)-based photomemristor *** ferroelectric depolarization was intentionally introduced into the ANN,which enables reconfigurable conductance and *** photoresponsivity as synaptic weight,the MFbased in-sensor ANN can operate analog convolutional computation,and successfully conduct perception and recognition of white-light letter images in experiments,with low processing energy *** Chinese digits are also recognized and regressed by a large-scale array,demonstrating its scalability and potential for low-power processing and the applications in MF-based in-situ artificial retina.

关键词： artificial networks ferroelectric

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侵财类“小案”治理模式的构建与运行

山西警察学院学报 2022年第3期30卷 47-54页

作者：田博博西南政法大学刑事侦查学院重庆401120

社会主要矛盾的转变,愈来愈使公众的目光逐渐转向“小案”管控之上,小案也日益成为了社会安全感的重要指标。其中,不管是从发案数量,还是管控难点,尤以侵财类“小案”最为突出。加之,网络虚拟空间的助力,使犯罪出现了线上、线下的二元... 详细信息

社会主要矛盾的转变,愈来愈使公众的目光逐渐转向“小案”管控之上,小案也日益成为了社会安全感的重要指标。其中,不管是从发案数量,还是管控难点,尤以侵财类“小案”最为突出。加之,网络虚拟空间的助力,使犯罪出现了线上、线下的二元化形态,时空分离、非接触性犯罪、群体或者组织犯罪等新的犯罪样态,给新时代犯罪治理带来了严峻的挑战。面对日益复杂的发案形势和灵活多变的作案手法,现有“小案”的管控模式,无疑已经暴露出了其自身的局限性。为了突破当下“小案”的管控瓶颈,应在现有“小案”管控成果的基础上,以数字治理为主导,优化、细化“小案”治理对策,从健全警民联动、加强数据控制、突破机制障碍、完善赃物布控、构建轻罪刑罚五个方面构建“小案”治理全新模式,从而实现侵财类“小案”有效治理。

关键词：社会治理小案管控模式犯罪治理数字治理

A Blockchain-Based Access Control Scheme for Reputation Value Attributes of the Internet of Things

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Computers, Materials & Continua 2024年第1期78卷 1297-1310页

作者： Hongliang tian Junyuan tian College of Electrical Engineering Northeast Electric Power UniversityJilin132012China

The Internet of Things(IoT)access controlmechanism may encounter security issues such as single point of failure and data *** address these issues,a blockchain-based IoT reputation value attribute access control scheme is ***,writing the reputation value as an attribute into the access control policy,and then deploying the access control policy in the smart contract of the blockchain system can enable the system to provide more fine-grained access control;Secondly,storing a large amount of resources fromthe Internet of Things in Inter Planetary File System(IPFS)to improve system throughput;Finally,map resource access operations to qualification tokens to improve the performance of the access control *** simulation experiments based on the Hyperledger Fabric *** simulation experimental results,it can be seen that the access control system can achieve more fine-grained and dynamic access control while maintaining high throughput and low time delay,providing sufficient reliability and security for access control of IoT devices.

关键词： Blockchain IoT access control Hyperledger Fabric