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MOFs‑Derived Strategy and Ternary Alloys Regulation in Flower‑Like Magnetic‑Carbon Microspheres with Broadband Electromagnetic Wave Absorption

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Nano-Micro Letters 2024年第11期16卷 479-493页

作者： Mengqiu Huang Bangxin Li Yuetong Qian Lei Wang Huibin Zhang Chendi Yang Longjun Rao Gang Zhou Chongyun Liang Renchao Che Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438People’s Republic of China Department of Chemistry Fudan UniversityShanghai 200438People’s Republic of China Materials Genome Institute Shanghai UniversityShanghai 200444People’s Republic of China School of Materials Science and Engineering Shanghai Institute of TechnologyShanghai 201418People’s Republic of China College of Physics Donghua UniversityShanghai 201620People’s Republic of China Zhejiang Laboratory Hangzhou 311100People’s Republic of China

Broadband electromagnetic(EM)wave absorption materials play an important role in military stealth and health ***,metal–organic frameworks(MOFs)-derived magnetic-carbon CoNiM@C(M=Cu,Zn,Fe,Mn)microspheres are fabricated,which exhibit flower-like nano–microstructure with tunable EM response *** on the MOFs-derived CoNi@C microsphere,the adjacent third element is introduced into magnetic CoNi alloy to enhance EM wave absorption *** term of broadband absorption,the order of efficient absorption bandwidth(EAB)value is Mn>Fe=Zn>Cu in the CoNiM@C ***,MOFs-derived flower-like CoNiMn@C microspheres hold outstanding broadband absorption and the EAB can reach up to 5.8 GHz(covering 12.2–18 GHz at 2.0 mm thickness).Besides,off-axis electron holography and computational simulations are applied to elucidate the inherent dielectric dissipation and magnetic *** heterointerfaces in CoNiMn@C promote the aggregation of the negative/positive charges at the contacting region,forming interfacial *** graphitized carbon layer catalyzed by the magnetic CoNiMn core offered the electron mobility path,boosting the conductive *** importantly,magnetic coupling is observed in the CoNiMn@C to strengthen the magnetic responding *** study provides a new guide to build broadband EM absorption by regulating the ternary magnetic alloy.

关键词： Magnetic-carbon microspheres MOFs derivatives Electromagnetic wave absorption Magnetic loss Broadband absorption

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Optical perfectly matched layers based on the integration of photonic crystals and material loss

Optical perfectly matched layers based on the integration of...

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作者： Zhang, Sheng Yang, Zuoheng Liu, Bingbing Luo, Jie Hang, Zhi Hong School of Physical Science and Technology Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou215006 China Institute for Advanced Study Soochow University Suzhou215006 China Ulink College of Suzhou Industrial Park Suzhou215125 China Institute of Theoretical and Applied Physics School of Physical Science and Technology Soochow University Suzhou215006 China Provincial Key Lab of Thin Films Soochow University Suzhou215006 China

Perfectly matched layer (PML) is a virtual absorption boundary condition adopted in numerical simulations, capable of absorbing light from all incident angles, which however is still lacking in practice in the optical regime. In this work, by integrating dielectric photonic crystals and material loss, we demonstrate an optical PML design with near-omnidirectional impedance matching and customized bandwidth. The absorption efficiency exceeds 90% for incident angle up to 80°. Good consistence is found between our simulations and proof-of-principle microwave experiments. Our proposal paves the road to realize optical PMLs, and could find applications in future photonic chips. © 2023 Optica Publishing Group.

关键词： Photonic crystals

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Smart reconfigurable metadevices made of shape memory alloy metamaterials

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Opto-Electronic Advances 2025年第2期8卷 6-14页

作者： Shiqiang Zhao Yuancheng Fan Ruisheng Yang Zhehao Ye Fuli Zhang Chen Wang Weijia Luo Yongzheng Wen Ji Zhou MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi'an 710129China State Key Lab of New Ceramics and Fine Processing Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China.

Reconfigurable metamaterials significantly expand the application scenarios and operating frequency range of metamaterials,making them promising candidates for use in smart tunable ***,we propose and experimentally demonstrate that integrating metamaterial design principles with the intrinsic features of natural materials can engineer thermal smart *** extraordinary optical transmission like(EOT-like)phenomena have been achieved in the microwave regime using shape memory alloy(SMA).The strongly localized fields generated by designed metadevices,combined with the intense interference of incident waves,enhance transmission through subwavelength *** the temperature-responsive properties of SMA,the morphology of the metadevice can be recontructed,thereby modifying its response to electromagnetic *** experiments demonstrated control over the operating frequency and transmission amplitude of EOT-like behavior,achieving a maximum transmission enhancement factor of ***,the metadevices with modular design enable the realization of multiple functions with independent control have been *** proposed SMA-based metamaterials offer advantages in terms of miniaturization,easy processing,and high design *** may have potential applications in microwave devices requiring temperature control,such as sensing and monitoring.

关键词： metamaterials extraordinary optical transmission shape memory alloy temperature tunability

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Understanding the Influence of Capping Layer on Spin Wave Modes: An In-Depth Investigation with a Custom Time-Resolved Magneto-Optical Kerr Effect (TR-MOKE) Setup

Understanding the Influence of Capping Layer on Spin Wave Mo...

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Magnetic Conference - Short Papers (INTERMAG Short Papers), IEEE International

作者： Debkanta Ghosh Chitra Dolai Shailab Singh Bodra Biswajeet Nayak Prasana Kumar Sahoo Prasanta Kumar Datta Department of Physics Ultra-fast Science Lab Indian Institute of Technology Kharagpur Kharagpur India Materials Science Centre Indian Institute of Technology Kharagpur Kharagpur West Bengal India

ISBN: (数字)9798350362213

ISBN: (纸本)9798350362220

Here, we investigated ultrafast magnetization dynamics of Ni thin film (10nm thickness) employing the time-resolved magneto-optical Kerr effect (TR-MOKE) with a two-color pump-probe setup in polar geometry. Systematically examining films with and without Hf0 2 capping layer of 4nm thickness, we observe the influence of external magnetic fields on magnetic precessional modes. Additionally, our study sheds light on the impact of capping layers on the Gilbert damping parameter $(\alpha)$ in relation to spin wave frequency. The outcomes provide insights into the recovery and potential improvement of spin mobility in Ni films

关键词： Magnetic films Kerr effect Geometry Damping Magnetomechanical effects Magnetization Nickel

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Electric-field control of topological spin textures in BiFe_(O3)/La_(0.67)Sr_(0.33)MnO_(3)heterostructure at room temperature

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Rare Metals 2023年第2期42卷 399-405页

作者： Ai-Ji Wang Liang Yang Jian Ge Gong-Xun Deng Yu-Ben Yang Jing-Di Lu Yue-Lin Zhang Yin-Shu Wang Hai-Ming Yu Ling-Fei Wang Ce-Wen Nan Jin-Xing Zhang Department of Physics Beijing Normal UniversityBeijing100875China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei230026China Fert Beijing Institute MIIT Key Laboratory of SpintronicsSchool of Integrated Circuit Science and EngineeringBeihang UniversityBeijing100191China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China

Electric-field control of topological magnetic states in thinfilm heterostructures is promising for applications in nextgeneration memory or logic devices with ultrahigh density and low-power *** materials,where spin and polar degrees of freedom coexist,provide a versatile playground to manipulate magnetism(converse magnetoelectric effect).Here,we report that the topological spin textures can be controlled by electric field in rhombohedral BiFeO_(3)/monoclinic La_(0.67)Sr_(0.33)MnO_(3)thin-film heterostructure at room temperature.

关键词： temperature textures field

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Advances in Cold Atom-based UHV/XHV Measurement

Advances in Cold Atom-based UHV/XHV Measurement

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第10届亚洲和澳大利亚真空与表面科学会议、中国真空学会2021学术年会、第十五届国际真空科学与工程应用学术会议

作者： Dong Meng Sun Wenjun Zhang Suzhao Wu Xiangmin Cheng Yongjun Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics

With the in-depth development and application of science and technology,ultra-high/extreme-high vacuum (UHV/XHV) is a necessary condition for high-tech and high-end equipment research fields including particle acceler... 详细信息

关键词： cold atom UHV/XHV quantum metrology measurement method

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vacuum pressure measurement based on 6Li in a magneto-optical trap

Vacuum pressure measurement based on 6Li in a magneto-optica...

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第10届亚洲和澳大利亚真空与表面科学会议、中国真空学会2021学术年会、第十五届国际真空科学与工程应用学术会议

作者： Zhang Suzhao Sun Wenjun Dong Meng Wu Xiangmin Cheng Yongjun Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics

With the development of technologies such as laser cooling and trapping of neutral atoms,time and frequency metrology,quantum information processing,cavity quantum dynamics and other related research based on ultra-co... 详细信息

关键词： cold atom magneto-optical trap trap depth loss rate coefficient

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Recent advances in fabrication and functions of neuromorphic system based on organic field effect transistor

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International Journal of Extreme Manufacturing 2024年第2期6卷 273-295页

作者： Yaqian Liu Minrui Lian Wei Chen Huipeng Chen School of Physics and Electronic Engineering Zhengzhou University of Light IndustryHenan 450002People’s Republic of China Institute of Optoelectronic Display National&Local United Engineering Lab of Flat Panel Display TechnologyFuzhou UniversityFuzhou 350002People’s Republic of China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207People’s Republic of China Department of Chemistry National University of Singapore3 Science Drive 3Singapore 117543Singapore Department of Physics National University of Singapore3 Science Drive 3Singapore 117543Singapore

The development of various artificial electronics and machines would explosively increase the amount of information and data,which need to be processed via in-situ *** synapse devices can store and process signals in a parallel way,thus improving fault tolerance and decreasing the power consumption of artificial *** organic field effect transistor(OFET)is a promising component for bioinspired neuromorphic systems because it is suitable for large-scale integrated circuits and flexible *** this review,the organic semiconductor materials,structures and fabrication,and different artificial sensory perception systems functions based on neuromorphic OFET devices are ***,a summary and challenges of neuromorphic OFET devices are *** review presents a detailed introduction to the recent progress of neuromorphic OFET devices from semiconductor materials to perception systems,which would serve as a reference for the development of neuromorphic systems in future bioinspired electronics.

关键词： organic field effect transistor neuromorphic systems synaptic transistor sensory perception systems device fabrication

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Hermitian and Non-Hermitian Topological Transitions Characterized by Manifold Distance

arXiv

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arXiv 2025年

作者： Fang, ZhaoXiang Gong, Ming Guo, Guang-Can Fu, Yongxu Xiong, Long School of Physical Science and Technology Xinjiang University Urumqi830046 China Key Lab of Quantum Information Chinese Academy of Sciences School of physics University of Science and Technology of China Hefei230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Key Lab of Quantum Information Chinese Academy of Sciences School of physics University of Science and Technology of China Hefei230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China

Topological phases are generally characterized by topological invariants denoted by integer numbers. However, different topological systems often require diffenent topological invariants to measure, and theses definition usually fail at critical points. Therefore, it’s challenging to predict what would occur during the transformation between two different topological phases. To address these issues, we propose a general definition based on fidelity and trace distance from quantum information theory: manifold distance (MD). This definition does not rely on the berry connection but rather on the information of the two manifolds - their ground state wave functions. Thus, it can measure different topological systems (including traditional band topology models, non-Hermitian systems, and gapless systems, etc.) and exhibit some universal laws during the transformation between two topological phases. Our research demonstrates: for different topological manifolds, the change rate (first-order derivative) or susceptibility (second-order derivative) of MD exhibit various divergent behaviors near the critical points. Compared to the strange correlator, which could be used as a diagnosis for short-range entangled states in 1D and 2D, MD is more universal and could be applied to non-Hermitian systems and long-range entangled states. For subsequent studies, we expect the method to be generalized te real-space or non-lattice models, in order to facilitate the study of a wider range of physical platforms such as open systems and many-body localization. © 2025, CC BY.

关键词： Wave functions

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Cornertronics in Two-Dimensional Second-Order Topological Insulators

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Physical Review Letters 2024年第17期133卷 176602页

作者： Yilin Han Chaoxi Cui Xiao-Ping Li Ting-Ting Zhang Zeying Zhang Zhi-Ming Yu Yugui Yao Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics School of Physical Science and Technology Beijing National Laboratory for Condensed Matter Physics Institute of Physics College of Mathematics and Physics

Traditional electronic devices rely on the electron’s intrinsic degrees of freedom (d.o.f.) to process information. However, additional d.o.f., like the valley, can emerge in the low-energy states of certain systems. Here, we show that the quantum dots constructed from two-dimensional second-order topological insulators posses a new kind of d.o.f., namely corner freedom, related to the topological corner states that reside at different corners of the systems. Since the corner states are well separated in real space, they can be individually and intuitively manipulated, giving rise to the concept of cornertronics. Via symmetry analysis and material search, we identify the TiSiCO-family monolayers as the first prototype of cornertronics materials, where the corner states can be controlled by both electric and optical fields due to novel corner-layer coupling effect and corner-contrasted linear dichroism. Furthermore, we find that the band gap of the TiSiCO nanodisk lies in the terahertz region and is robust to size reduction. These results indicate that the TiSiCO nanodisks can be used to design terahertz devices with ultrasmall size and electric-field tunable band gap. Besides, the TiSiCO nanodisks are simultaneously sensitive to both the strength and polarization of the terahertz waves. Our findings not only pave the way for cornertronics, but also open a new direction for research in two-dimensional second-order topological insulators, quantum dots, and terahertz electronics.

关键词： Electrical properties First-principles calculations Topological materials Quantum dots

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