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European Frequency and Time Forum (EFTF)

作者： Tian Zhao Jiqing Lian Senliang Wu Jie Miao Zhendong Chen Ruoao Yang Duo Pan Jingbiao Chen School of Electronics Peking University Beijing China School of Mechano-Electronic Engineering Xidian University Xi'an China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Hefei National Laboratory Heifei China

ISBN: (数字)9798350354270

ISBN: (纸本)9798350354287

This article reports a scheme for obtaining coherent population trapping (CPT) spectrum based on a chip-scale external cavity diode laser (CECDL). The CPT spectrum linewidth is 680Hz. Compared to the scheme using vertical cavity surface emitting laser (VCSEL), CECDL has a comparable small volume and higher laser power of 14mW and narrower linewidth of 270kHz. This is beneficial for improving the frequency stability performance of CPT chip-scale atomic clocks.

关键词： Time-frequency analysis Laser noise Power lasers Europe Laser stability Diode lasers Vertical cavity surface emitting lasers Atomic clocks Signal to noise ratio

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Digital Light Processing 3D-Printed Ceramic Metamaterials for Electromagnetic Wave Absorption

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Nano-Micro Letters 2022年第7期14卷 279-292页

作者： Rui Zhou Yansong Wang Ziyu Liu Yongqiang Pang Jianxin Chen Jie Kong MOE Key Lab of Materials Physics and Chemistry in Extraordinary Conditions Shaanxi Key Lab of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Key Laboratory of Optical System Advance Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033People’s Republic of China School of Electronic Science and Engineering Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China

Combining 3D printing with precursor-derived ceramic for fabricating electromagnetic(EM) wave-absorbing metamaterials has attracted great attention. This study presents a novel ultraviolet-curable polysiloxane precursor for digital light processing(DLP) 3D printing to fabricate ceramic parts with complex geometry, no cracks and linear shrinkage. Guiding with the principles of impedance matching, attenuation, and effective-medium theory, we design a crosshelix-array metamaterial model based on the complex permittivity constant of precursor-derived ceramics. The corresponding ceramic metamaterials can be successfully prepared by DLP printing and subsequent pyrolysis process, achieving a low reflection coefficient and a wide effective absorption bandwidth in the X-band even under high temperature. This is a general method that can be extended to other bands, which can be realized by merely adjusting the unit structure of meta-materials. This strategy provides a novel and effective avenue to achieve “target-design-fabricating” ceramic metamaterials, and it exposes the downstream applications of highly efficient and broad EM wave-absorbing materials and structures with great potential applications.

关键词： Electromagnetic wave absorption Metamaterial Precursor-derived ceramics 3D printing

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A review of hard carbon anode: Rational design and advanced characterization in potassium ion batteries

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InfoMat 2022年第2期4卷 24-52页

作者： Hang Lei Jinliang Li Xiyun Zhang Liang Ma Zhong Ji Zilong Wang Likun Pan Shaozao Tan Wenjie Mai Guangdong Engineering&Technology Research Centre of Graphene-like Materials and Products Department of ChemistryCollege of Chemistry and Materials ScienceJinan UniversityGuangzhouChina Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhouGuangdongChina Shanghai Key Laboratory of Magnetic Resonance School of Physics and Electronic ScienceEast China Normal UniversityShanghaiChina

K-ion batteries(KIBs)have attracted tremendous attention and seen significant development because of their low price,high operating voltage,and properties similar to those of Li-ion *** the field of development of full batteries,exploring high-performing and low-cost anode materials for K-ion storage is a crucial *** to their excellent cost effectiveness,abundant precursors,and environmental benignancy,hard carbons(HCs)are considered promising anode materials for *** a result,researchers have devoted much effort to quantify the properties and to understand the underlying mechanisms of HC-based *** this review,we mainly introduce the electrochemical reaction mechanism of HCs in KIBs,and summarize approaches to further improve the electrochemical performance in HC-based materials for K-ion *** addition,we also highlight some advanced in situ characterization methods for understanding the evolutionary process underlying the potassiation–depotassiation process,which is essential for the directional electrochemical performance optimization of ***,we raise some challenges in developing smart-structured HC anode materials for KIBs,and propose rational design principles and perspectives serving as the guidance for the targeted optimization of HC-based KIBs.

关键词： advanced characterization hard carbon heteroatom doping potassium ion batteries structural engineering

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Coherent dual optical frequency combs generation system based on series-parallel mixed modulators

Coherent dual optical frequency combs generation system base...

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2024 International Conference on Optoelectronic Materials and Devices, ICOMD 2024

作者： Hao, Yanwei Hu, Zhefeng Li, Zihao Zhao, Yachao Sun, Yuzhe Chen, Kaixin Sun, Wenbao Song, Qianqian School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China Tianjin Jinhang Technical Physics Institute Tianjin300308 China Research Center for Frontier Fundamental Studies Zhejiang Lab. Hangzhou311100 China

ISBN: (数字)9781510689046

ISBN: (纸本)9781510689039

A coherent dual optical frequency combs (OFCs) generation system is proposed using a wavelength division multiplexer (WDM) and series-parallel mixed Mach-Zehnder modulators (MZMs). The system achieves independent tuning of the tooth space of each OFC ranging from 2 to 150 GHz. 16 comb teeth within 5 dB range are observed in each comb. © 2025 SPIE.

关键词： Microwave photonics

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Synthesis,disorder and Ising anisotropy in a new spin liquid candidate PrMgAl_(11)O_(19)

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Materials Futures 2024年第3期3卷 148-156页

作者： Yantao Cao Huanpeng Bu Zhendong Fu Jinkui Zhao Jason S Gardner Zhongwen Ouyang Zhaoming Tian Zhiwei Li Hanjie Guo Key Lab for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou UniversityLanzhou 730000People’s Republic of China Songshan Lake Materials Laboratory DongguanGuangdong 523808People’s Republic of China Institute of Physics Chinese Academy of SciencesBeijing 100190People’s Republic of China Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTN 37831United States of America School of Physics and Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Here we report the successful synthesis of large single crystals of triangular frustrated PrMgAl_(11)O_(19)using the optical floating zone *** crystal x-ray diffraction(XRD)measurements unveiled the presence of quenched disorder within the mirror plane,specifically~7%of Pr ions deviating from the ideal 2d site towards the 6h *** susceptibility measurements revealed an Ising anisotropy with the c-axis being the easy *** a large spin–spin interaction that develops below~10 K and considerable site disorder,the spins do not order or freeze down to at least 50 *** availability of large single crystals offers a distinct opportunity to investigate the exotic magnetic state on a triangular lattice with an easy axis out of the plane.

关键词： spin liquid disorder frustration triangular lattice Ising anisotropy

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The far-field plasma characterization in a 600W Hall thruster plume by laser-induced fluorescence

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Plasma science and technology 2020年第5期22卷 83-94页

作者： Xingyue DUAN Xiong YANG Mousen CHENG Ning GUO Xiaokang LI Moge WANG Dawei GUO College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410000People's Republic of China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 730000People's Republic of China

Non-intrusive characterization of the singly ionized xenon velocity in Hall thruster plume using laser induced fluorescence(LIF)is critical for constructing a complete picture of plume plasma,deeply understanding the ion dynamics in the plume,and providing validation data for numerical *** work presents LIF measurements of singly ionized xenon axial velocity on a grid ranging from 100 to 300 mm in axial direction and from 0 to 50 mm in radial direction for a600 W Hall thruster operating at the nominal condition of discharge voltage 300 V and discharge current 2 A,the influence of discharge voltage is investigated as *** ion velocity distribution function(IVDF)results in the far-field plume demonstrate a profile of bimodal IVDFs,especially prominent at radial distances greater than channel inner radius of 22 mm at axial position of 100 mm,which is quite different from that of the near-field plume where bimodal IVDFs occur in the central core region for the same power Hall thruster when compared to previous LIF measurements of BHT-600 by Hargus(2010 *** Power 26135).Beyond 100 mm,only single-peak IVDFs are *** two-dimensional ion velocity vector field indicates the bimodal axial IVDF is merely a geometry effect for the annular discharge channel in the far-field *** about the IVDF,the most probable velocity and the accelerating potential profile along the centerline all indicate that ions are still accelerating at axial distances greater than 100 mm,and the maximum most probable velocity measured at300 mm downstream of the exit plane is about 19 km *** addition,the most probable velocity of ions along radial direction changes a little except the lower velocity ion populations in the bimodal IVDF *** ion temperature at axial distances of 10 and 300 mm oscillates along the radial direction,while the ion temperature first increases,and then decreases for the 200 mm ***,the axial position for the ion peak axial

关键词： laser-induced fluorescence Hall thruster ion velocity distribution function optical diagnostic

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Zr_(2)SeB and Hf_(2)SeB:Two new MAB phase compounds with the Cr_(2)AlC-type MAX phase(211 phase)crystal structures

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Journal of Advanced Ceramics 2022年第11期11卷 1764-1776页

作者： Qiqiang ZHANG Yanchun ZHOU Xingyuan SAN Wenbo LI Yiwang BAO Qingguo FENG Salvatore GRASSO Chunfeng HU Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China Hebei Key Lab of Optic–Electronic Information and Materials College of Physics Science and TechnologyHebei UniversityBaoding 071002China State Key Laboratory of Green Building Materials China Building Materials AcademyBeijing 100024China

The ternary or quaternary layered compounds called MAB phases are frequently mentioned recently together with the well-known MAX ***,MAB phases are generally referred to layered transition metal borides,while MAX phases are layered transition metal carbides and nitrides with different types of crystal structure although they share the common nano-laminated structure *** order to prove that MAB phases can share the same type of crystal structure with MAX phases and extend the composition window of MAX phases from carbides and nitrides to borides,two new MAB phase compounds Zr_(2)SeB and Hf_(2)SeB with the Cr_(2)AlC-type MAX phase(211 phase)crystal structure were discovered by a combination of first-principles calculations and experimental verification in this ***-principles calculations predicted the stability and lattice parameters of the two new MAB phase compounds Zr_(2)SeB and Hf_(2)*** they were successfully synthesized by using a thermal explosion method in a spark plasma sintering(SPS)*** crystal structures of Zr_(2)SeB and Hf_(2)SeB were determined by a combination of the X-ray diffraction(XRD),scanning electron microscopy(SEM),and high-resolution transmission electron microscopy(HRTEM).The lattice parameters of Zr_(2)SeB and Hf_(2)SeB are a=3.64398Å,c=12.63223Åand a=3.52280Å,c=12.47804Å,*** the atomic positions are M at 4f(1/3,2/3,0.60288[Zr]or 0.59889[Hf]),Se at 2c(1/3,2/3,1/4),and B at 2a(0,0,0).And the atomic stacking sequences follow those of the Cr_(2)AlC-type MAX *** work opens up the composition window for the MAB phases and MAX phases and will trigger the interests of material scientists and physicists to explore new compounds and properties in this new family of materials.

关键词： Zr_(2)SeB and Hf_(2)SeB MAB phase MAX phase first-principles calculations thermal explosion synthesis

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Two-dimensional deep learning magnetotelluric inversion 11

Two-dimensional deep learning magnetotelluric inversion

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11th International Conference on Environmental and Engineering Geophysics, ICEEG 2024

作者： Liu, W. Wang, H. Guo, T. Yan, M.S. Xi, Z.Z. Natl. Loc. Jt. Eng. Lab. of Marine Mineral Resources Exploration Equipment and Safety Technology Hunan University of Science and Technology Hunan Xiangtan China School of Geosciences and Info-Physics Central South University Hunan Changsha China

Deep learning (DL) inversion methods have showcased promising applications in solving geophysical inverse problems. In this work, we develop a DL model (SwinTUNet) to enable accurate reconstruction of the nonlinear mapping between the network inputs and outputs and achieve two-dimensional (2-D) magnetotelluric (MT) inversion. SwinTUNet is built by employing the strong Swin Transformer as the backbone network and adopting the UNet architecture. Moreover, to create a training dataset that aligns with practical MT inverse problems and ensuring effective applications, we design and generate a set of random synthetic resistivity models with gradual-varying resistivity values. Inversion examples demonstrate that the proposed SwinTUNet inversion method holds a great promise in promoting the applicability of DL inversion methods in realistic MT prospecting scenarios. © 2024 Institute of physics Publishing. All rights reserved.

关键词： Magnetotellurics

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Run-and-Tumble Dynamics and Mechanotaxis Discovered in Microglial Migration

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Research 2024年第2期2023卷 95-103页

作者： Yiyu Zhang Da Wei Xiaochen Wang Boyi Wang Ming Li Haiping Fang Yi Peng Qihui Fan Fangfu Ye Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Wenzhou Institute University of Chinese Academy of SciencesWenzhouZhejang 325000China Songshan Lake Materials Laboratory DongguanGuangdong 523808China School of Science East China University of Science and TechnologyShanghai 200237China Oujang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)WenzhouZhejiang 325000China

Microglia are resident macrophage cells in the central nervous system that search for pathogens or abnormal neural activities and migrate to resolve the *** effective search and targeted motion of macrophages mean dearly to maintaining a healthy brain,yet little is known about their migration *** this work,we study microglial motion with and without the presence of external *** discover that the cells are promptly attracted by the applied forces(i.e.,mechanotaxis),which is a tactic behavior as yet unconfirmed in ***,in both the explorative and the targeted migration,microglia display dynamics that is strikingly analogous to bacterial run-and-tumble motion.A closer examination reveals that microglial run-and-tumble is more sophisticated,e.g.,they display a short-term memory when tumbling and rely on active steering during runs to achieve mechanotaxis,probably via the responses of mechanosensitive ion *** differences reflect the sharp contrast between microglia and bacteria cells(eukaryotes ***)and their environments(compact tissue ***).Further analyses suggest that the reported migration dynamics has an optimal search efficiency and is shared among a subset of immune cells(human monocyte and macrophage).This work reveals a fruitful analogy between the locomotion of 2 remote systems and provides a framework for studying immune cells exploring complex environments.

关键词： analogy closer prompt

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Magnetic Nanodevices and Spin-Transport Properties of a Two-Dimensional CrSCl Monolayer

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Physical Review Applied 2023年第5期19卷 054013-054013页

作者： Juncai Chen Yongliang Guo Chunlan Ma Shijing Gong Chuanxi Zhao Tianxing Wang Xiao Dong Zhaoyong Jiao Shuhong Ma Guoliang Xu Yipeng An School of Physics Henan Normal University Xinxiang 453007 China School of Science Henan Institute of Technology Xinxiang 453003 China School of Physics and Technology Suzhou University of Science and Technology Suzhou 215009 China Department of Physics East China Normal University Shanghai 200062 China Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan University Guangzhou 510632 China

The two-dimensional intrinsic ferromagnet CrSCl monolayer has considerable potential for application in the development of spintronic devices because of properties such as robust ferromagnetic ordering, large spin polarization, high Curie temperature, and high carrier mobilities. Here, we investigate the electromagnetic properties of the CrSCl monolayer and the spin-transport properties of some conceptual magnetic devices we construct, such as p-n-junction diodes, field-effect transistors, and phototransistors, by means of first-principles calculations. The results indicate that the p-n-junction diodes of the CrSCl monolayer exhibit full spin-polarized transport behavior, and both the p-n and p-i-n junctions show excellent spin-filtering behavior. The phototransistor of the CrSCl monolayer exhibits spin-resolved photoresponse characteristics for different wavelengths of light. Furthermore, it possesses the ability to generate a fully spin-up polarized current in the visible range. Our results provide key insights into the fundamental physical properties and the underlying transport and photoresponse mechanisms of the CrSCl monolayer.

关键词： First-principles calculations Spin filtering Spin optoelectronics Spin polarization Transport phenomena Diodes Ferromagnets Monolayer films

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