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Current-induced magnetization switching in all-oxide SrIrO3/SrMn0.35Ir0.65O3 heterostructures

Physical Review materials 2025年第4期9卷 044404-044404页

作者： Pengxiang Hou Shengkai Liu Zhiyu Liu Yajie Han Yuqi Wang Zhongnan Xi Yu Deng Yurong Yang Di Wu National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures Jiangsu Key Laboratory of Artificial Functional Materials and Department of Materials Science and Engineering Nanjing University Nanjing 210093 People's Republic of China Beijing Institute of Smart Energy Beijing 102209 People's Republic of China

Using spin-orbit torque to realize field-free switching of magnetic moments in spintronic devices has attracted extensive attention. Here, we observed, in SrIrO3/SrMn0.35Ir0.65O3 heterostructures, that the spin-Hall effect in the SrIrO3 layer produced a spin-orbit torque strong enough to switch the magnetization in the adjacent SrMn0.35Ir0.65O3 layer with perpendicular magnetic anisotropy. The magnetic easy axis tilting helps to realize a field-free magnetization switching in the heterostructure with a critical current density as low as 1.20×106Acm−2. There is a dampinglike torque in this all-oxide heterostructure with a high efficiency about 82.9×10−6OeA−1cm2. These findings may help to explore the potential applications of perovskite material in highly efficient spintronic devices.

关键词： Perovskite

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Sn-O dual-doped Li-argyrodite electrolytes with enhanced electrochemical performance

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Journal of Energy Chemistry 2021年第8期30卷 530-537,I0011页

作者： Ting Chen Dewu Zeng Long Zhang Meng Yang Dawei Song Xinlin Yan Chuang Yu Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of Technology300384 TianjinChina Institute of Solid State Physics Vienna University of TechnologyWiedner Hauptstr.8-101040 ViennaAustria Department of Mechanical and Materials Engineering University of Western Ontario1151 Richmond StN6A 3K7 LondonCanada

As a type of candidate for all-solid-state Li batteries,argyrodite solid electrolytes possess high ionic conductivity,but poor compatibility against Li ***,we report novel Li_(6) PS_(5) I-based argyrodite sulfides with Sn-O dual doping,which is a powerful solution to comprehensively improve the performance of a *** combination of O and Sn-aliovalent doping not only enables an improved ionic conductivity but more importantly realizes an intensively enhanced interfacial compatibility between argyrodite and Li metal and Li dendrite suppression *** assembled battery with Sn-O dual-doped electrolyte and Li anode demonstrates high capacity and decent cycling *** doping is thus believed to be an effective way to develop high performance sulfide solid electrolytes.

关键词： Lithium dendrite suppression Interface Dual doping Argyrodite solid electrolyte All-solid-state lithium-metal battery

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Detector-integrated vertical-cavity surfaceemitting laser with a movable high-contrast grating mirror

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Photonics Research 2024年第7期12卷 1437-1448页

作者： MINGLU WANG HONGLING PENG CHENXI HAO XUYAN ZHOU WANHUA ZHENG ANJIN LIU Key Laboratory of Optoelectronic Materials and Devices Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Solid-State Optoelectronics Information Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

In this paper, we present a detector-integrated vertical-cavity surface-emitting laser(VCSEL) with a movable high-contrast grating(HCG) mirror in an n-i-p-i-n manner. The detector-integrated VCSEL with a movable HCG can achieve three functions, including wavelength tuning, power monitoring, and resonant-cavity-enhanced(RCE)photon detection. Currently, the device can achieve a wavelength tuning range of 27 nm at room temperature when the suspended HCG is driven by the reverse-bias voltage. The n-i-p structure located at the upper part of the device can serve as an intra-cavity photodiode to monitor the output power due to the defect absorption. The RCE photon detection function of the detector-integrated VCSEL with a movable HCG is measured, and it has a peak responsivity at about 926 nm. This detector-integrated VCSEL with a movable HCG will be useful for sensing and imaging.

关键词： tuning laser cavity

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Self-polarized RGB device realized by semipolar micro-LEDs and perovskite-in-polymer films for backlight applications

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Opto-Electronic Advances 2024年第3期7卷 35-49页

作者： Tingwei Lu Yue Lin Tianqi Zhang Yue Huang Xiaotong Fan Shouqiang Lai Yijun Lu Hao-Chung Kuo Zhong Chen Tingzhu Wu Rong Zhang School of Electronic Science and Engineering Fujian Engineering Research Center for Solid-State LightingXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China Department of Photonics and Graduate Institute of Electro-Optical Engineering College of Electrical and Computer EngineeringYang Ming Chiao Tung UniversityHsinchu 30010China Semiconductor Research Center Hon Hai Research InstituteTaipei 11492China.

In backlighting systems for liquid crystal displays,conventional red,green,and blue(RGB)light sources that lack polarization properties can result in a significant optical loss of up to 50%when passing through a *** address this inefficiency and optimize energy utilization,this study presents a high-performance device designed for RGB polarized *** device employs an array of semipolar blueμLEDs with inherent polarization capabilities,coupled with mechanically stretched films of green-emitting CsPbBr3 nanorods and red-emitting CsPbI3-Cs4PbI6 hybrid *** CsPbBr3 nanorods in the polymer film offer intrinsic polarization emission,while the aligned-wire structures formed by the stable CsPbI3-Cs4PbI6 hybrid nanocrystals contribute to substantial anisotropic emissions,due to their high dielectric *** resulting device achieved RGB polarization degrees of 0.26,0.48,and 0.38,respectively,and exhibited a broad color gamut,reaching 137.2%of the NTSC standard and 102.5%of the Rec.2020 *** compared to a device utilizing c-plane LEDs for excitation,the current approach increased the intensity of light transmitted through the polarizer by 73.6%.This novel fabrication approach for polarized devices containing RGB components holds considerable promise for advancing next-generation display technologies.

关键词： halide perovskite light-emitting-diodes polarized emission nanocrystals stability

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Active beam steering enabled by photonic crystal surface emitting laser

Active beam steering enabled by photonic crystal surface emi...

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2023 Opto-Electronics and Communications Conference, OECC 2023

作者： Si, Jiahao Wang, Mingjin Chen, Zihao Xu, Yuanbo Chen, Jingxuan Zhang, Zheng Liu, Wenzhen Peng, Chao Zheng, Wanhua Institute of Semiconductors CAS Laboratory of Solid State Optoelectronics Information Technology Beijing China Institute of Semiconductors CAS Laboratory of Solid State Optoelectronics Information Technology State Key Laboratory on Integrated Optoelectronics Beijing China Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics & Frontiers Science Center for Nano-optoelectronics Beijing China Huawei Technologies Co. Ltd. Wuhan China Peng Cheng Laboratory Shenzhen China Institute of Semiconductors CAS College of Future Technology Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Laboratory of Solid State Optoelectronics Information Technology State Key Laboratory on Integrated Optoelectronics Beijing China

A dynamically controlled beam steering photonic crystals surface-emitting laser is proposed in this work. We demonstrate its fast beam steering across a range of 3.2° × 4° in a time scale of 500 nanosec... 详细信息

ISBN: (纸本)9781665462136

关键词： Surface emitting lasers

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Observation of Topological Transition in Floquet Non-Hermitian Skin Effects in Silicon Photonics

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Physical Review Letters 2024年第7期133卷 073803-073803页

作者： Zhiyuan Lin Wange Song Li-Wei Wang Haoran Xin Jiacheng Sun Shengjie Wu Chunyu Huang Shining Zhu Jian-Hua Jiang Tao Li National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and Manipulations Jiangsu Key Laboratory of Artificial Functional Materials School of Physics College of Engineering and Applied Sciences School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology School of Biomedical Engineering Suzhou Institute for Advanced Research School of Physics

Non-Hermitian physics has greatly enriched our understanding of nonequilibrium phenomena and uncovered novel effects such as the non-Hermitian skin effect (NHSE) that has profoundly revolutionized the field. NHSE has been predicted in systems with nonreciprocal couplings which, however, are challenging to realize in experiments. Without nonreciprocal couplings, the NHSE can also emerge in systems with coexisting gauge fields and loss or gain (e.g., in Floquet non-Hermitian systems). However, such Floquet NHSE remains largely unexplored in experiments. Here, we realize the Floquet NHSEs in periodically modulated optical waveguides integrated on a silicon photonic platform. By engineering the artificial gauge fields induced by the periodical modulation, we observe various Floquet NHSE phases and unveil their rich topological transitions. Remarkably, we discover the transitions between the unipolar NHSE phases and an unconventional bipolar NHSE phase, which is accompanied by the directional reversal of the NHSEs. The underlying physics is revealed by the band winding in complex quasienergy space which undergoes a topology change from isolated loops with the same winding to linked loops with opposite windings. Our work unfolds a new route toward Floquet NHSEs originating from the interplay between gauge fields and dissipation effects, and thus offers fundamentally new ways for steering light and other waves.

关键词： Edge states Integrated optics Topological effects in photonic systems Floquet systems Non-Hermitian systems Waveguide arrays

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Enhanced selectivity of catalytic hydrogenation of halogenated nitroaromatics by interfacial effects

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无机化学学报 2025年第1期41卷 201-212页

作者： HUANG Rui LIU Shengjie WU Qingyuan ZHENG Nanfeng New Cornerstone Science Laboratory State Key Laboratory for Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy MaterialsNational&Local Joint Engineering Research Center of Preparation Technology of NanomaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamenFujian 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) XiamenFujian 361002China

The highly selective catalytic hydrogenation of halogenated nitroaromatics was achieved by employing Pd‑based catalysts that were co‑modified with organic and inorganic *** was demonstrated that the catalysts contained Pd species in mixed valence states,with high valence Pd at the metal‑support interface and zero valence Pd at the metal *** the strong coordination of triphenylphosphine(PPh3)to Pd0 on the Pd surface prevents the adsorption of halogenated nitroaromatics and thus dehalogenation,the coordination of sodium metavanadate(NaVO3)to high‑valence Pd sites at the interface helps to activate H2 in a heterolytic pathway for the selective hydrogenation of nitro‑*** excellent catalytic performance of the interfacial active sites enables the selective hydrogenation of a wide range of halogenated nitroaromatics.

关键词： halogenated nitroaromatic heterogeneous catalysis hydrogenation selectivity control interfacial effect

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Reversible LiOH chemistry in Li-O_(2)batteries with free-standing Ag/δ-MnO_(2)nanoflower cathode

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science China materials 2022年第6期65卷 1431-1442页

作者： Linna Dai1 Qing Sun Yuqing Yao Huanhuan Guo Xiangkun Nie Jianwei Li Pengchao Si Jingyu Lu Deping Li Lijie Ci Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education) Research Center for Carbon NanomaterialsSchool of Materials Science and EngineeringShandong UniversityJinan 250061China State Key Laboratory of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Science Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

The low energy efficiency and poor cycle stability arising from the high aggressivity of discharge products toward organic electrolytes limit the practical applications of Li-O_(2)batteries(LOBs).Compared with the typical discharge product Li_(2)O_(2),LiOH shows better chemical and electrochemical *** this study,a free-standing cathode composed of hydrangea-likeδ-MnO_(2)with Ag nanoparticles(NPs)embedded in carbon paper(CP)(Ag/δ-MnO_(2)@CP)is fabricated and used as the catalyst for the reversible formation and decomposition of *** possible discharge mechanism is investigated by in situ Raman measurement and density functional theory *** confirm thatδ-MnO_(2)dominantly catalyzes the conversion reaction of discharge intermediate LiO_(2)*to LiOH and that Ag particles promote its catalytic *** the presence of Ag/δ-MnO_(2)@CP cathode,the LOB exhibits enhanced specific capacity and a high discharge voltage plateau under humid O_(2)*** a current density of 200 mA g^(−1),the LOB with the Ag/δ-MnO_(2)@CP cathode presents an overpotential of 0.5 V and an ultra-long cycle life of 867 cycles with a limited specific capacity of 500 mA h g^(−1).This work provides a fresh view on the role of solid catalysts in LOBs and promotes the development of LOBs based on LiOH discharge product for practical applications.

关键词： Li-O_(2)batteries Ag nanoparticles δ-MnO_(2) reversible LiOH in situ Raman

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Temperature Dependent In-Plane Anisotropic Magnetoresistance in HfTe_(5) Thin Layers

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Chinese Physics Letters 2021年第1期38卷 86-91页

作者： Peng Wang Tao Hou Fangdong Tang Peipei Wang Yulei Han Yafei Ren Hualing Zeng Liyuan Zhang Zhenhua Qiao International Center for Quantum Design of Functional Materials Hefei National Laboratory for Physical Sciences at the MicroscaleSynergetic Innovation Centre of Quantum Information and Quantum PhysicsCAS Key Laboratory of Strongly Coupled Quantum Matter Physicsand Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Department of Physics Southern University of Science and Technologyand Shenzhen Institute for Quantum Science and EngineeringShenzhen 518055China Solid State Nanophysics Max Plank Institute for Solid State ResearchStuttgartGermany

We report the observation of in-plane anisotropic magnetoresistance and planar Hall effect in non-magnetic HfTe_(5) thin *** observed anisotropic magnetoresistance as well as its sign is strongly dependent on the critical resistivity anomaly temperature T_(p).Below T_(p),the anisotropic magnetoresistance is negative with large negative *** the in-plane magnetic field is perpendicular to the current,the negative longitudinal magnetoresistance reaches its *** negative longitudinal magnetoresistance effect in HfTe_(5) thin layers is dramatically different from that induced by the chiral anomaly as observed in Weyl and Dirac *** potential underlying origin may be attributed to the reduced spin scattering,which arises from the in-plane magnetic field driven coupling between the top and bottom surface *** findings provide valuable insights for the anisotropic magnetoresistance effect in topological electronic systems and the device potential of HfTe5 in spintronics and quantum sensing.

关键词： magnetoresistance anisotropic attributed

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Li+/Mg2+ co-intercalation SnS2-SPAN cathode for super-stable magnesium-based batteries

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Journal of Magnesium and Alloys 2024年

作者： Wang, Yiyi Guan, Zhenfeng Zhang, Yinggan Qu, Baihua Sa, Baisheng Zhou, Xiaoyuan Wang, Jingfeng Peng, Dong-Liang Xie, Qingshui Pan, Fusheng State Key Lab of Physical Chemistry of Solid Surface Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials College of Materials Xiamen University Xiamen361005 China College of Materials Science and Engineering National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing400044 China Chongqing Institute of New Energy Storage Materials and Equipment Chongqing401135 China Multiscale Computational Materials Facility College of Materials Science and Engineering Fuzhou University Fuzhou350100 China

Magnesium-lithium hybrid batteries (MLHBs) have gained increasing attention due to their combined advantages of rapid ion insertion/extraction cathode and magnesium metal anode. Herein, SnS2-SPAN hybrid cathode with strong C-Sn bond and rich defects is ingeniously constructed to realize Mg2+/Li+ co-intercalation. The physical and chemical double-confinement synergistic engineering of sulfurized polyacrylonitrile can suppress the agglomeration of SnS2 nanoparticles and the volume expansion, simultaneously promote charge transfer and enhance structural stability. The introduced abundant sulfur vacancies provide more active sites for Mg2+/Li+ co-intercalation. Meanwhile, the beneficial effects of rich sulfur defects and C-Sn bond on enhanced electrochemical properties are further evidenced by density-functional theory (DFT) calculations. Therefore, compared with pristine SnS2, SnS2-SPAN cathode displays high specific capacity (218 mAh g−1 at 0.5 A g−1 over 700 cycles) and ultra-long cycling life (101 mAh g−1 at 5 A g−1 up to 28,000 cycles). And a high energy density of 307 Wh kg−1 can be realized by the SnS2-SPAN//Mg pouch cell. Such elaborate and simple design supplies a reference for the exploitation of advanced cathode materials with excellent electrochemical properties for MLHBs. © 2024

关键词： Intercalation

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