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Graphene/h-BN/ReS₂ Heterostructure Operating in Fowler−Nordheim Tunneling Regime for Polarization-Sensitive Fast Photodetector

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advanced Electronic Materials 2025年

作者： Zhou, Tianyi Yang, Ming Wang, Jingyao Chen, Xiang Yan, Qingyu Watanabe, Kenji Takashi, Taniguchi Liu, Xue Huang, Yuqing Xu, Weigao Wang, Xinran Gao, Li Hu, Zehua National Laboratory of Solid State Microstructures School of Electronic Science and Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Department of Physics Tsinghua University Beijing 100084 China School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu 610054 China Institute of Electronic and Electrical Engineering Civil Aviation Flight University of China Guanghan 618307 China Advanced Materials Laboratory National Institute for Materials Science Ibaraki Tsukuba 305-0044 Japan National Institute for Materials Science Namiki 1-1 Ibaraki Tsukuba 305-0044 Japan Institutes of Physical Science and Information Technology Anhui University Hefei 230601 China State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China Key Laboratory of Mesoscopic Chemistry School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China School of Integrated Circuits Nanjing University Suzhou 215163 China Suzhou Laboratory Suzhou 215123 China State Key Laboratory for Organic Electronics and Information Displays (KLOEID) Institute of Advanced Materials (IAM) School of Materials Science and Engineering Nanjing University of Posts and Telecommunications Nanjing 210023 China

On-chip polarization photodetectors are crucial for advancing optical communication, which is facing the challenges of limited polarization sensitivity and hard on-chip integration. 2D materials offer unique opportunities for creating high-performance polarization photodetectors thanks to their intrinsic anisotropy and extensive heterostructure design freedom. Herein, a graphene/h-BN/ReS₂ tunneling heterostructure is designed to realize a high-performance polarization photodetector in the Fowler−Nordheim tunneling (FNT) regime. Specifically, the photodetector achieves a high photocurrent signal-to-noise ratio of ≈10³ by suppressing the tunneling dark current with the hBN tunneling layer. The h-BN also creates a strong electric field, which accelerates the photogenerated carriers and achieves a response time of ≈70 µs. Such a high signal-to-noise ratio and short response time are over two orders of magnitude stronger and shorter than those of field-effect transistor-type ReS₂ photodetectors. Moreover, in the FNT regime, the contribution of an anisotropic tunneling barrier and effective hole mass can effectively enhance the photocurrent dichroic ratio to exceed the intrinsic absorption dichroic ratio of 1.61, achieving the maximal value of 1.85. The enhancement mechanism is well understood by the consistent experimental and theoretical results. This study provides a viable approach to designing high-performance on-chip polarization photodetectors by utilizing the characteristics of the FNT regime. © 2025 The Author(s). advanced Electronic Materials published by Wiley-VCH GmbH.

关键词： fowler–nordheim tunneling polarization photodetector ReS2

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Exploring the Limits of Superconductivity in Metal-Stuffed B-C Clathrates via Ionic Lattice Anharmonicity

arXiv

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arXiv 2025年

作者： Zhao, Wenbo Sun, Ying Li, Jiaxiang Yuan, Peng Iitaka, Toshiaki Zhong, Xin Li, Hefei Fang, Yue-Wen Liu, Hanyu Errea, Ion Xie, Yu Key Laboratory of Material Simulation Methods and Software of Ministry of Education College of Physics Jilin University Changchun130012 China International Center of Future Science Jilin University Changchun130012 China College of Physics Jilin University Changchun130012 China Discrete Event Simulation Research Team RIKEN Center for Computational Science 2-1 Hirosawa Saitama Wako351-0198 Japan State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun130012 China Europa Plaza 1 Donostia/San Sebastián20018 Spain Manuel de Lardizabal Pasealekua 5 Donostia/San Sebastián20018 Spain Manuel de Lardizabal Pasealekua 4 Donostia/San Sebastián20018 Spain Key Laboratory of Physics and Technology for Advanced Batteries of Ministry of Education College of Physics Jilin University Changchun130012 China

Metal-stuffed B−C compounds with sodalite clathrate structure have captured increasing attention due to their predicted exceptional superconductivity above liquid nitrogen temperature at ambient pressure. However, by neglecting the quantum lattice anharmonicity, the existing studies may result in an incomplete understanding of such a lightweight system. Here, using state-of-the-art ab initio methods incorporating quantum effects and machine learning potentials, we revisit the properties of a series of XYB6C6 clathrates where X and Y are metals. Our findings show that ionic quantum and anharmonic effects can harden the Eg and Eu vibrational modes, enabling the dynamical stability of 15 materials previously considered unstable in the harmonic approximation, including materials with previously unreported (XY)1+ state, which is demonstrated here to be crucial to reach high critical temperatures. Further calculations based on the isotropic Migdal-Eliashberg equation demonstrate that the Tc values for KRbB6C6 and RbB3C3 among these stabilized compounds are 87 and 98 K at 0 and 15 GPa, respectively, both being higher than Tc of 77 K of KPbB6C6 at the anharmonic level. These record-high Tc values, surpassing liquid nitrogen temperatures, emphasize the importance of anharmonic effects in stabilizing B–C clathrates with large electron-phonon coupling strength and advancing the search for high-Tc superconductivity at (near) ambient pressure. © 2025, CC BY.

关键词： Technetium compounds

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The dielectric behavior and efficient microwave absorption of doped nanoscale LaMnO_(3)at elevated temperature

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Nano Research 2022年第8期15卷 7731-7741页

作者： Zhigang Mu Guoke Wei Hang Zhang Lu Gao Yue Zhao Shaolong Tang Guangbin Ji College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology InstituteBeijing 100024China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China

LaMnO_(3)perovskite has great potential in microwave absorption at high temperature due to its complex doping effect and super *** current research mainly focuses on the doping ratio regulation,while the mechanism of doping effect at high temperature is still lack of sufficient *** this work,La1−xSrxMn1−yFeyO_(3)(LaMnO_(3),La_(0.7)Sr_(0.3)MnO_(3),and La_(0.7)Sr_(0.3)Mn_(0.8)Fe_(0.2)O_(3))nanostructures with different doping sites were successfully prepared by the solid phase reaction ***,the high temperature dielectric test samples were obtained by mixing with cordierite(2MgO·2Al_(2)O_(3)·5SiO_(2)(MAS)).The results showed that the temperature dependence of Mn ion spin state had a significant impact on the high temperature dielectric behavior of La_(1−x)Sr_(x)Mn_(1−y)FeyO_(3).Particularly,when the thickness is only 1.9 mm,La_(0.7)Sr_(0.3)Mn_(0.8)Fe_(0.2)O_(3)/MAS can achieve the widest bandwidth of 4.2 GHz covered the entire X-band(8.2–12.4 GHz)and a minimum reflection loss(RL)value of−17.99 dB at 500℃.In order to improve the operating temperature of La_(0.7)Sr_(0.3)Mn_(0.8)Fe_(0.2)O_(3)/MAS,a cellular array structure was designed by using computer simulation technology(CST)software to introduce magnetic *** the outer length of the hexagon is 1 mm and the coating thickness is 1.9 mm,the widest bandwidth covers the X-band and the minimum RL value is−15.35 dB at 800℃.Therefore,La_(0.7)Sr_(0.3)Mn_(0.8)Fe_(0.2)O_(3)has a great prospect as an efficient high temperature microwave absorber.

关键词： microwave absorption doping perovskite high temperature dielectric behavior

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Design and characterization of a novel Cu_(2.3)Al_(1.3)Ni_(1.7)SnCr_(0.3) multi-principal element alloy coating on magnesium alloy by laser cladding

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Journal of Materials science & technology 2023年第21期152卷 220-236页

作者： Lipeng Jiang Xiufang Cui Guo Jin Zhimin Tian Xin Wen Haoliang Tian Erbao Liu Institute of Surface/Interface Science and Technology Key Laboratory of Superlight Material and Surface Technology of Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing Beijing Institute of Aeronautical MaterialsBeijing 100095China Institute of Defense Engineering AMSPLABeijing 100850China

The evaporation and dilution of substrate seriously limit the performance of laser cladding coatings on magnesium *** order to overcome the above shortcomings,a multi-step ultrasonic assisted laser remelting technology was proposed to improve the performance of the *** this work,a novel Cu_(2.3)Al_(1.3)Ni_(1.7)SnCr_(0.3) multi-principal element alloy coating(MPEAC)was prepared on the surface of mag-nesium *** techniques such as transmission electron microscopy(TEM),electron back scatter diffraction(EBSD)and scanning electron microscopy(SEM)were employed to characterize the microstructure and phase composition of the *** the phase structure and morphology at the interface between the coating and the substrate were also studied via focus ion beam(FIB)and TEM *** addition,the corrosion and wear resistance ability of the coatings were monitored by potentiodynamic polarization(PDP),and electrochemical impedance spectroscopy(EIS),hardness and friction *** results show that Cu_(2.3)Al_(1.3)Ni_(1.7)SnCr_(0.3) MPEAC with ultrasonic assisted is composed of FCC phase and eutectic phases(Cu_(10)Sn_(3) and Cu_(2)Ni_(3)Sn_(3)).Due to the forced convection generated by ultrasonic waves,some Cu and Ni phases are precipitated around Cu_(2)Ni_(3)Sn_(3) phases,which is beneficial to enhance the corrosion *** of the grain refinement effect caused by ultrasonic,the wear resistance of the coating is also ***,ultrasonic vibration can effectively weaken and eliminate the texture density of the Cu_(2.3)Al_(1.3)Ni_(1.7)SnCr_(0.3) MPEAC fabricated by laser cladding.

关键词： Magnesium alloy Multi-principal element alloy coating Ultrasonic assisted laser cladding Corrosion resistance Wear resistance

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Researches on modeling and simulation of turbo-shaft engine and main rotor system

Researches on modeling and simulation of turbo-shaft engine ...

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2009 WRI World Congress on Computer science and Information Engineering, CSIE 2009

作者： Ma, Shi-Dong Han, Liang Gong, Guang-Hong Song, Xiao Aviation Key Laboratory for Advanced Simulation Technology Beijing University of Aeronautics and Astronautics Beijing 100191 China

ISBN: (纸本)9780769535074

Modeling of power system plays an important part in modeling of helicopter dynamics system. The precision of turbo-shaft engine model affects directly the fidelity of power system model in process of modeling and simulation on helicopter. Modeling techniques of turbo-shaft engine are studied first, secondly, engine control system model based on main rotor load feedback is proposed and an inner-outer series-wound control loop to adjust engine output power based on feedback control is developed. The control law of turbo-shaft engine power adjustment is designed. Consequently, integrative model of turboshaft engine and main rotor on helicopter power system is realized. A simulation example for helicopter power system is given in this paper to validate the integrative model. © 2008 IEEE.

关键词： Helicopters

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Multi-dimensional simulations for extensive off-design conditions of gas turbines by iterative-coupled methods using different characteristic maps of coaxial compressor and turbine

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Case Studies in Thermal Engineering 2025年 72卷

作者： Weimin Deng Guangming Ren Linyuan Jia Zuojun Wei Yuchun Chen Xiaohua Gan School of Power and Energy Northwestern Polytechnical University Xi'an 710072 China Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen 518055 China Science and Technology on Altitude Simulation Laboratory Mianyang 621000 China Shenzhen Key Laboratory of Wide-Speed-Range and Variable-Density Continuous Wind Tunnel Southern University of Science and Technology Shenzhen 518000 China National Key Laboratory of Science and Technology on Advanced Light-duty Gas-turbine Xi'an 710129 China

Multi-dimensional simulations offer a complementary numerical platform to gas turbine experimentation, generating supportive data for training adaptation and artificial intelligence models. However, the application of iterative-coupled simulations to extensive off-design conditions depends significantly on the accuracy of generic characteristic maps, particularly near choke and stall regions. In this study, multi-dimensional simulation based on iterative-coupled models using three different sets of maps was developed. Based on experimental speed characteristics data, the standard deviation of performance parameters simulated from the three iterative-coupled models was found to be less than 10 −3 . Further analysis reveals the convergence consistent traits that the different characteristic maps used in the iterative-coupled simulations only affect convergence speed and scope and do not impact the final convergence results. To apply iterative-coupled simulations to extensive off-design conditions, a self-moving strategy based on the convergence consistent traits of different characteristic maps was developed. The iterative-coupled simulations using the self-moving strategy have an extensive convergence scope, including adjustable-nozzle-area conditions (0.0013–0.008 m 2 , 78 %–479 %) and adjustable-power-extraction conditions (0–16 kW, 0 %–80 %). This demonstrates that the self-moving strategy for inexact generic characteristic maps can apply iterative-coupled simulations to extensive off-design, compared to the CLM with exact specific characteristic maps.

关键词： Iterative-coupled simulations Component-level model Adaptation method Gas turbine Thermodynamics Computational fluid dynamics

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Dynamics of a Cortical Neural Network Based on a Simple Model

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Chinese Physics Letters 2012年第8期29卷 52-55页

作者： QU Jing-Yi WANG Ru-Bin Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation UniversityTianjin 300300 Institute for Cognitive Neurodynamics School of ScienceEast China University of Science and TechnologyShanghai 200237

The collective dynamics of a randomly connected neuronal network motivated by the anatomy of a mammalian cortex based on a simple model are *** simple model can not only reproduce the rich behaviors of biological neurons but also has only two equations and one nonlinear *** varying some key parameters,such as the connection weights of neurons,the external current injection and the noise of intensity,this neuronal network will exhibit various collective *** is demonstrated that the synchronization status of the neuronal network has a strong relationship with the key parameters and the external current has more influence on the spiking of inhibitory neurons than that of excitatory *** results may be instructive in understanding the collective dynamics of a mammalian cortex.

关键词： anatomy collective cortex

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The effect of primary and secondary O phase on the mechanical properties and deformation behavior of Ti 2 AlNb alloy

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Journal of Alloys and Compounds 2025年 1032卷

作者： Minghang Zhou Zhiqiang Bu Yi Zhou Jiakun Wang Liang Zhu Xu Huang Jinfu Li State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical Materials Beijing 100095 China

The effect of different microstructure characteristics on the mechanical properties and deformation behavior of the Ti 2 AlNb alloy are investigated. The results show that the mechanical properties of the Ti 2 AlNb alloy can be significantly enhanced by modulating the size and content of the primary O (O pri ) and secondary O (O sec ) phase. Quasi-in-situ tensile tests and transmission electron microscopy observations indicate that the B2 phase is the primary deformation phase, with tensile deformation mainly utilizing the {110} < 111 > slip systems, while the deformation of the O phase is governed by the basal slip system and minor prismatic slip systems. The O pri phase can simultaneous deformation with the B2 phase through single, double, and cross-slip modes, thus promoting the uniform plastic deformation. In contrast, the O sec phase can effectively impede dislocation slip and generate higher local stress levels. Therefore, to maintain the overall uniform deformation, the dislocations tend to pass through the O sec phase via cross-slip mode. The strengthening mechanism calculations suggest that the primary strengthening mechanisms of the Ti 2 AlNb alloy after heat treatment are the solid solution strengthening, and Orowan strengthening of O sec phase. These findings will provide a theoretical basis for optimization of microstructure and mechanical properties of Ti 2 AlNb alloy in the future.

关键词： Tenacity

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Analysis and optimizations of macro-pulse performances for a constructed high-power beam injector with a compact layout

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Nuclear Engineering and technology 2025年

作者： H. Hu Y. Wang H.J. Xu Y.F. Zeng T.N. Hu H.M. Wang G.Y. Feng Y.J. Pei State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China Chengdu Aircraft Design & Research Institute Aviation Industry Corporation of China Chengdu 610091 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 China

The performance of terahertz (THz) radiation from free electron lasers (FEL) depends on the consistency of electron bunches within the macro-pulse, not just the properties of individual bunches. In accelerator-based injectors, bunch-to-bunch deviations often arise due to transient beam loading effects. This study investigates the impact of such transient responses on macro-pulse inconsistencies by combining theoretical analysis and particle simulations, using the FEL injector at Huazhong University of science and technology (HUST) as a case study. The goal is to optimize macro-pulse performance without requiring additional equipment or facility upgrades. To achieve this, an improved multi-objective optimization algorithm, NSGA-III, is introduced to optimize RF injection timing and phase settings, targeting energy and phase consistency within the macro-pulse and stable energy output. The approach is validated through extensive virtual simulations, which demonstrate its effectiveness in providing optimal initial settings for the HUST-FEL injector’s macro-pulse. Subsequent online experiments conducted on this injector have preliminarily validated the reliability of the proposed method as well. The results are applicable to other multi-bunch/macro-pulse injectors, offering a cost-effective solution for efficient beam commissioning and engineering implementation.

关键词： Beam injector transient beam loading free electron laser linac beam dynamics

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Damaging model of cruise missile barraged by antiaircraft gun

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Xitong Fangzhen Xuebao / Journal of System simulation 2006年第SUPPL. 2期18卷 83-84+88页

作者： Chang, Er-Li Han, Liang Aviation Science and Technology Key Laboratory for Advanced Simulation Technology BUAA Beijing 100083 China

Damage rules and damage trees were proposed according to researching into the structure and characteristic of the cruise missile. Damage model was built based on the rules of projectile dispersion and the principle of armour-piercing mechanics. The simulation was run by a certain cruise missile and its result is given. From the result of the simulation, the damaging course of the cruise missile barraged by antiaircraft gun can be depicted.

关键词： Armour-piercing mechanics Damaging model Mott school Projectile dispersion System simulation

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