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Observation of Mott instability at the valence transition of f-electron system

National science Review 2023年第6期10卷 183-190页

作者： Haifeng Yang Jingjing Gao Yingying Cao Yuanji Xu Aiji Liang Xiang Xu Yujie Chen Shuai Liu Kui Huang Lixuan Xu Chengwei Wang Shengtao Cui Meixiao Wang Lexian Yang Xuan Luo Yuping Sun Yi-feng Yang Zhongkai Liu Yulin Chen School of Physical Science and Technology Shanghai Tech University Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Science Island Branch of Graduate School University of Science and Technology of China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Shanghai Tech Laboratory for Topological Physics State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua University State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences High Magnetic Field Laboratory Chinese Academy of Sciences Collaborative Innovation Center of Microstructures Nanjing University Songshan Lake Materials Laboratory Department of Physics University of Oxford

Mott physics plays a critical role in materials with strong ele ctronic *** insulator-to-metal transition can be driven by chemical doping,external pressure,temperature and gate voltage,which is often seen in transition metal oxides with 3d electrons near the Fermi energy（*** superconductor）.In4f-electron systems,however,the insulator-to-metal transition is mostly driven by Kondo hybridization and the Mott physics has rarely been explored in ***,by combining the angle-resolved photo emission spectroscopy and strongly correlated band structure calculations,we show that an unusual Mott instability exists in YbInCu4accompanying its mysterious first-order valence *** contrasts with the prevalent Kondo picture and demonstrates that YbInCu4is a unique platform to explore the Mott physics in Kondo lattice *** work provides important insight for the understanding and manipulation of correlated quantum phenomena in the f-electron system.

关键词： valence transition orbital-selectiveMott transition Kondo coupling heavy fermions strong correlations ARPES DMFT

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Optimal Formation Tracking of Second-Order Multi-Agent systems Without Velocity Interactions 43

Optimal Formation Tracking of Second-Order Multi-Agent Syste...

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43rd Chinese Control Conference, CCC 2024

作者： Cao, Xiao-Ying Yi, Jing-Wen Chai, Li Wuhan University of Science and Technology School of Information Science and Engineering Wuhan430081 China Zhejiang University State Key Laboratory of Industrial Control Technology Zhejiang310027 China

ISBN: (纸本)9789887581581

In this paper, we address the optimal formation tracking issue of second-order multi-agent systems without velocity interactions. Firstly, by employing model transformation, the formation tracking problem is converted into a consensus problem for the deviation system, and necessary and sufficient conditions to achieve the formation tracking are obtained. Then, by establishing the direct relationship among the convergence rate, control gains and the network topology, analytical expressions of optimal control gains and the fastest convergence rate are derived by using the Routh-Hurwitz criterion. Finally, the effectiveness of the proposed algorithm is verified through numerical simulations. © 2024 Technical Committee on Control Theory, Chinese Association of Automation.

关键词： Control theory

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Inequalities in urban thermal and greenspace exposures:A case study for China’s Greater Bay Area from 2010 to 2020

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Building Simulation 2024年第11期17卷 1933-1949页

作者： Xue Zhong Lihua Zhao Peng Ren Yuanjian Teng Xiang Zhang State Key Laboratory of Subtropical Building and Urban Science Department of ArchitectureSouth China University of TechnologyGuangzhou510640China Institute of Remote Sensing and Geographic Information System School of Earth and Space SciencesPeking UniversityBeijing100871China Chair for Strategic Landscape Planning and Management School of Life Sciences WeihenstephanTechnical University of MunichEmil-Ramann-Str.685354FreisingGermany

The interaction between humans and their environment significantly impacts the health of urban ***,there is limited research on assessing the spatiotemporal variations of human thermal exposure as well as inequalities and their relationships with greenspace based on remote sensing data,especially in developing *** study offers a framework utilizing pixel-wise data on land surface coolness index(LSCI),normalized difference vegetation index(NDVI),and population metrics to evaluate population-weighted thermal and greenspace exposures in China’s Greater Bay Area(GBA)over eleven years(2010–2020).It further examines thermal exposure inequality using the Gini index and explores both natural and socio-economical drivers of thermal exposure and its *** results indicate an increasing trend of cities within the GBA being experiencing detrimental thermal *** the study period,the proportion of cities with high exposure to LSCI and NDVI exhibited a general *** 63.6%of major cities observed growing imbalances in LSCI and NDVI exposures over eleven ***,there were positive correlations between NDVI exposure and LSCI exposure,along with their associated ***,coastal cities characterized by lower elevations,higher precipitation rates,and rapid economic growth experienced higher levels of LSCI and NDVI exposures yet these cities also demonstrated greater disparities.

关键词： exposure inequality land surface coolness index(LSCI) normalized difference vegetation index(NDVI) spatiotemporal variation Greater Bay Area(GBA)

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An insight into the pass effect of the planet gear from an elastodynamics perspective

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science China(Technological sciences) 2023年第8期66卷 2415-2431页

作者： HUANGFU YiFan DONG XingJian CHEN KangKang LI ZhanWei PENG ZhiKe Institute of Vibration Shock and NoiseState Key Laboratory of Mechanical System and VibrationShanghai Jiao Tong UniversityShanghai 200240China National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Mechanical Engineering Ningxia UniversityYinchuan 750021China

Distinguished from parallel-axis gear systems,the revolution of the carrier brings out the pass effect of the planet *** with the phenomenological descriptions in conventional studies,this paper aims to provide more abundant physical information and the elastodynamics mechanism of the pass effect of the planet *** this end,a continuous-discrete model of helical planetary gears is *** both the in-plane and out-of-plane vibration,a semi-analytical model is established to simulate the elastic ring *** elastic and the lumped parameter submodels are synthesized using the moving elastic coupling *** simulated modal and dynamic characteristics are verified using a planetary gear test *** on the proposed dynamic model,the pass effect of the planet gear,the effects of bolt constraint,and the out-of-plane vibration of helical planetary gears are *** is revealed that the“realistic rotation”strategy adopted in the proposed dynamic model can better reflect the physical essence of the pass effect of the planet gear compared with the“pseudo rotation”strategy utilized in the traditional model.

关键词： planetary gear elastodynamics pass effect semi-analytical model dynamic characteristics

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Development of China's spaceborne SAR satellite,processing strategy,and application:take Gaofen-3 series as an example

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地球空间信息科学学报（英文版） 2024年第1期27卷 221-236页

作者： Guo Zhang Shunyao Wang Zhenwei Chen Yuzhi Zheng Ruishan Zhao Taoyang Wang Yu Zhu Xinzhe Yuan Wei Wu Weitao Chen State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina School of Law Wuhan UniversityWuhanChina School of Geomatics Liaoning Technical UniversityFuxinChina School of Remote Sensing and Information Engineering Wuhan UniversityWuhanChina Institute of Spacecraft System Engineering China Academy of Space TechnologyBeijingChina National Disaster Reduction Center of China Ministry of Emergency ManagementBeijingChina School of Computer Science China University of GeosciencesWuhanChina Key Laboratory of Space Ocean Remote Sensing and Application Ministry of Natural Resources of the People's Republic of ChinaBeijingChina

After mastering the key technologies of manufacturing spaceborne Synthetic Aperture Radar(SAR),China's SAR satellites have been successfully launched into *** the only civil microwave satellite listed in the"National High-resolution Earth Observation system Major Project,"the Gaofen-3(GF-3)01 satellite is the first C-band multi-polarization SAR satellite with a resolution of 1 ***-3 series satellites stand out among civil SAR satellites worldwide because of their high resolution,wide swath,high geometric radiation quality,multiple imaging modes,and long operation *** GF-3 series satellites as an example,this study introduces the development of China's civil SAR satellites,as well as their processing strategies and *** success of the GF-3 series satellites shows that China's SAR remote sensing technology has stepped into a new era of high-quality and high-precision Earth observations.

关键词： High-resolution Synthetic Aperture Radar(SAR) GaoFen-3(GF-3)satellites earth observation

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An Optically Transparent Reflectarray Based on Fine Metal Lines and Low-loss Substrate 12

An Optically Transparent Reflectarray Based on Fine Metal Li...

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12th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2024

作者： Zhou, Jianjing Hu, Haobin Zhou, Jiaqi Chen, Yu Cai, Longzhu Jiang, Zhi Hao Southeast University State Key Laboratory of Millimeter Waves School of Information Science and Engineering Nanjing210096 China Aerospace System Engineering Shanghai Shanghai201109 China

ISBN: (纸本)9798350351019

A new type of optically transparent reflectarray with fine metal lines (FMLs) and low-loss substrate is investigated in this work. The reflectarray consists of a FML patch, cyclic olefin copolymer (COC) substrate, polyethylene terephthalate (PET) substrate and an indium tin oxide (ITO) ground. The FML patch, with a linewidth of 50 μ m, adopts a multi-resonant structure to broaden the range of phase variation. At the operating frequency of 29 GHz, the reflection loss and phase change of the proposed reflectarray element are 1.1 dB and 491°, respectively. The fabricated reflectarray achieves a measured gain of 23.36 dBi, a high aperture efficiency of 40.6%, and a 1-dB gain bandwidth of 22.41%, demonstrating great potential in future communication systems. © 2024 IEEE.

关键词： Tin oxides

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Performance Investigation and Realization of an Integrated V-Band Lens Antenna with Low-loss COC Dielectric Materials 12

Performance Investigation and Realization of an Integrated V...

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12th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2024

作者： Chen, Yu Hu, Haobin Zhou, Erya Zhou, Jianjing Cai, Longzhu Jiang, Zhi Hao Southeast University State Key Laboratory of Millimeter Waves School of Information Science and Engineering Nanjing210096 China Aerospace System Engineering Shanghai Shanghai201109 China

ISBN: (纸本)9798350351019

This paper presents the design of an integrated V-band (50-75 GHz) dielectric lens antenna featuring a high gain of 30 dBi, utilizing low-loss cyclic olefin copolymer (COC). The study comprehensively compares and analyzes the effects of horn disturbances and integration methods in practical applications. Various materials, thicknesses, and tilt angles for the housing are examined, resulting in different degrees of loss, ultimately leading to the analysis of an optimal scenario. Following fabrication, assembly, and testing, the integrated lens antenna achieves 3 dB beamwidth of 4.79°, a gain of 30.22 dBi at the center frequency of 62.5 GHz, and an aperture efficiency of 53.11%. © 2024 IEEE.

关键词： Lens antennas

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First Demonstration of Wafer-level Arrayed β-Ga2O3 Thin Films and MOSFETs on Diamond by Transfer Printing technology

First Demonstration of Wafer-level Arrayed β-Ga2O3 Thin Fil...

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2024 IEEE International Electron Devices Meeting, IEDM 2024

作者： Zhao, Tiancheng Yu, Xinxin Xu, Wenhui He, Yang Qu, Zhenyu Shen, Rui Wang, Ruize Guo, Huaixin Sun, Huarui Li, Zhonghui Zhou, Min You, Tiangui Ou, Xin State Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China CETC Key Laboratory of Carbon-based Electronics Nanjing Electronic Devices Institute Nanjing210016 China National Key Laboratory of Solid-State Microwave Devices and Circuits Nanjing210016 China School of Science Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System Harbin Institute of Technology Shenzhen518055 China

ISBN: (纸本)9798350365429

We, for the first time, fabricated wafer-level arrayed βGa2O3 single crystal thin films on diamond substrate using transfer printing technology. The transfer-printed β-Ga2O3 thin film possesses a thickness of 260 nm, a XRD rocking curve FWHM of ~78 arcsec, and a surface roughness of 0.36 nm. The amorphous interface layer after post-annealing is less than 2 nm. The thermal boundary resistance is extracted to 21.7 m2·K/GW, which is the lowest value reported for single-crystal β-Ga2O3 integrated with diamond. Thanks to the high thermal conductivity of diamond and the high-quality hetero-interface, the performance of β-Ga2O3-on-diamond RF MOSFETs is significantly enhanced. The maximum on-state current is 810 mA/mm, and the fmax before de-embedding reaches 61 GHz, which is the highest recorded value to date. Infrared thermal imaging shows that integrating with diamond significantly reduces the junction temperature of β-Ga2O3 devices. The Rth of β-Ga2O3-ondiamond devices is merely 5.52 K·mm/W, setting a new record for βGa2O3-based devices. These results demonstrate that hetero-integration with diamond via wafer-level transfer printing technology provides an effective thermal management platform for β-Ga2O3, facilitating its advancement in high-power and RF devices. © 2024 IEEE.

关键词： Substrates

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Port-controllable routing of orbital angular momentum modes using a rotatable diffractive neural network

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science China(Physics,Mechanics & Astronomy) 2025年第6期68卷 154-163页

作者： Junmin Liu Jiafu Chen Qingji Zeng Zemin Liang Xinping Wu Xin Zhao Jiangnan Xiao Huapeng Ye Ze Dong Dianyuan Fan Shuqing Chen Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China Terahertz Technology Innovation Research Institute Shanghai Key Laboratory of Modern Optical SystemTerahertz Science Cooperative Innovation CenterSchool of Optical-Electrical Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China

Orbital angular momentum(OAM)modes provide an additional orthogonal physical dimension,offering transformative potential for enhancing optical communication *** significant progress in mode multiplexing,the development of robust communication networks faces persistent challenges,particularly in effectively routing and controlling these multiplexed channels among network *** tackle these dilemmas,we propose a rotatable diffractive neural network(R-DNN)strategy and demonstrate its capability for port-controllable OAM mode *** leveraging the correlation between the orthogonal evolution of OAM modes in free space and phase modulations during propagation,the R-DNN precisely shapes the spatial evolution of mode fields through multiple rotatable phase layers,enabling efficient routing to specific output *** approach exploits the interaction of secondary wavelets with the relative states of the rotatable layers,allowing on-demand control of mode evolution paths and enhancing routing *** a proof of concept,we developed a tri-functional router that successfully directs three OAM modes to individually controllable output *** router achieves an average intermode crosstalk of less than−16.4 dB across three functional states,one-dimensional,two-dimensional,and cross-connected switching,while supporting the routing of 5.85 Tbit/s quadrature phase-shift keying *** results highlight the R-DNN’s effectiveness in achieving precise and controllable OAM mode manipulation,paving the way for advanced applications in mode-multiplexed communication networks and beyond.

关键词： orbital angular momentum mode mode routing diffractive neural network

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Health benefits from the rapid reduction in ambient exposure to air pollutants after China's clean air actions:progress in efficacy and geographic equality

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National science Review 2024年第2期11卷 103-113页

作者： Tao Xue Ruohan Wang Meng Wang Yanying Wang Dan Tong Xia Meng Conghong Huang Siqi Ai Fangzhou Li Jingyuan Cao Mingkun Tong Xueqiu Ni Hengyi Liu Jianyu Deng Hong Lu Wei Wan Jicheng Gong Shiqiu Zhang Tong Zhu Institute of Reproductive and Child Health National Health Commission Key Laboratory of Reproductive Health/Department of Epidemiology and Biostatistics Ministry of Education Key Laboratory of Epidemiology of Major Diseases(PKU) School of Public Health Peking University Health Science Centre State Environmental Protection Key Laboratory of Atmospheric Exposure and Health Risk Management and Center for Environment and Health Peking University Advanced Institute of Information Technology Peking University Department of Epidemiology and Environmental Health School of Public Health and Health ProfessionsUniversity at Buffalo State Key Joint Laboratory of Environment Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking University Department of Earth System Science Tsinghua University School of Public Health Key Laboratory of Public Health Safety of the Ministry of Education and Key Laboratory of Health Technology Assessment of the Ministry of HealthFudan University College of Land Management Nanjing Agricultural University National&Local Joint Engineering Research Center for Rural Land Resources Use and Consolidation Clean Air Asia

Clean air actions （CAAs） in China have been linked to considerable benefits in public ***,whether the beneficial effects of CAAs are equally distributed geographically is *** high-resolution maps of the distributions of major air pollutants (fine particulate matter[PM2.5]and ozone[O3]) and population,we aimed to track spatiotemporal changes in health impacts from,and geographic inequality embedded in,the reduced exposures to PM2.5and O3from 2013 to *** used a method established by the Global Burden of Diseases *** analyzing the changes in loss of life expectancy（LLE） attributable to PM2.5and O3,we calculated the gain of life expectancy （GLE） to quantify the health benefits of the air-quality ***,we assessed the geographic inequality embedded in the GLE using the Gini index （GI）.Based on risk assessments of PM2.5and O3,during the first stage of CAAs（2013 to 2017）,the mean GLE was 1.87 *** of the sum of the GLE was disproportionally distributed in about one quarter of the population exposed （GI 0.44）.During the second stage of CAAs（2017 to 2020）,the mean GLE increased to 3.94 months and geographic inequality decreased （GI 0.18）.According to our assessments,CAAs were enhanced,from the first to second stages,in terms of not only preventing premature mortality but also ameliorating health *** enhancements were related to increased sensitivity to the health effects of air pollution and synergic control of PM2.5and *** findings will contribute to optimizing future CAAs.

关键词： clean air action public health inequality fine particulate matter ozone

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