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Growth modes ofβ-Ga_(2)O_(3)on h-BN:Remote epitaxy and van der Waals epitaxy

Nano Research 2025年第2期18卷 887-895页

作者： Yiming Shi Junhua Meng Zhengchang Xia Jidong Huang Wenkang Liu Ji Jiang Zhigang Yin Jinxiang Deng Xingwang Zhang School of Physics and Optoelectronic Engineering Beijing University of TechnologyBeijing 100124China Key Lab of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Integrating monoclinic gallium oxide(β-Ga_(2)O_(3))with two-dimensional(2D)hexagonal boron nitride(h-BN)into heterostructures is of significant importance for achieving high-power device *** 2D-material-assisted epitaxy provides a straightforward integration method for fabricatingβ-Ga_(2)Og/h-BN vertical *** this work,theβ-Ga_(2)O_(3)films were deposited on both polycrystalline and single-crystalline h-BN layers with different thicknesses,and two growth modes ofβ-Ga_(2)O_(3)films on h-BN,remote epitaxy,and van der Waals(vdW)epitaxy,were *** results show that the potential of the sapphire substrate can penetrate the monolayer and bilayer h-BN to obtain the remote epitaxy ofβ-Ga_(2)O_(3)films,regardless of the crystallinity of *** vdW epitaxy ofβ-Ga_(2)O_(3)film can be realized on the monocrystalline h-BN *** with the conventional and remote epitaxialβ-Ga_(2)O_(3)films on sapphire substrate,the vdW epitaxialβ-Ga_(2)O_(3)films on the single-crystalline h-BN substrate exhibit higher *** work indicates that the 2D-material-assisted epitaxy provides a feasible scheme for the heterogeneous integration ofβ-Ga_(2)O_(3)films.

关键词： β-Ga_(2)O_(3) h-BN remote epitaxy van der Waals epitaxy heterostructures

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Layer-Valley Hall Effect under Inversion and Time-Reversal Symmetries

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Chinese physics Letters 2024年第6期41卷 88-97页

作者：赵交交刘贵斌陈鹏姚裕贵张广宇杜罗军 Beijing National Laboratory for Condensed Matter Physics and Key Laboratory for Nanoscale Physics and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijing 100081China Schoolof Microelectronics Southern University of Science and TechnologyShenzhen 518055China Songshan Lake Materials Laboratory Dongguan 523808China

Hall effects have been the central paradigms in modern physics,materials science and practical applications,and have led to many exciting breakthroughs,including the discovery of topological Chern invariants and the revolution of metrological resistance *** date,the Hall effects have mainly focused on a single degree of freedom(Do F),and most of them require the breaking of spatial-inversion and/or time-reversal *** we demonstrate a new type of Hall effect,i.e.,layer-valley Hall effect,based on a combined layer-valley Do F characterized by the product of layer and valley *** layer-valley Hall effect has a quantum origin arising from the layer-valley contrasting Berry curvature,and can occur in nonmagnetic centrosymmetric crystals with both spatial-inversion and time-reversal symmetries,transcending the symmetry constraints of single Do F Hall effect based on the constituent layer or valley ***,the layer-valley Hall effect is highly tunable and shows a W-shaped pattern in response to the out-of-plane electric ***,we discuss the potential detection approaches and material-specific design principles of layer-valley Hall *** results demonstrate novel Hall physics and open up exotic paradigms for new research direction of layer-valleytronics that exploits the quantum nature of the coupled layer-valley DoF.

关键词： quantum Inversion curvature

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Gas Expansion Process in the Dynamic vacuum Calibration

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Journal of Shanghai Jiaotong university(science) 2021年第2期26卷 193-200页

作者： CHENG Yongjun CHEN Shupin WANG Chenghong XI Zhenhua SUN Wenjun LIU Dan Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 730000China School of Petrochemical Engineering Lanzhou University of TechnologyLanzhou 730050China

By analyzing the gas expansion process from the upstream chamber via an orifice and a very rapid-opening ultra-high vacuum(UHV)gate valve to downstream one,the standard pressure analytical model basedon the dvnamic vacuum calibration apparatus in millisecond range developed by Lanzhou Institute of physics(LIP)is deduced theoretically and corrected by real gas characteristics and temperature *** to the Kuudsen criterion,there is no free molecular fow regime in the area in front of the orifice during the gas expansion,so the chocked fow approximation is adopted to reduce the difficulty of numerical computation Under this anproxiuatiou and the full opening of the rapid valve,the standard pressure expression is calculated theoretically,and the upstream chamber pressure and temperature changes are obtained by numerical simulation during the gas expansion from 100 kPa to ***,experiments are performed using capacitance diaphragmgauges(model CDG045Dhs),The uncertainties between the measured pressure and the simulated and theoretical ones are 10%and 4.65%,respectively,which indicates that the apparatus can generate predictable pressure changes in the millisecond rauge and the conceptual model can better approximate the calibration ***,the orifice conductance,and the correction factors of real gas characteristics and temperature change to the standard pressure are calculated accordins to the simulation results:the corrected staudard pressure expression is obtained.

关键词： dynamic vacuum calibration standard pressure numerical investigation gas expansion conductance

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Regulation of Mechanical Properties of Conductive Polymer Composites

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Chinese Journal of Polymer science 2024年第12期42卷 1855-1880,I0005页

作者： Ling Zhu Shuai Chen Meng Zhou Si-Ying An Li-Shan Liang You-Liang Shen Ze-Xu Xue School of Pharmacy Jiangxi Science&Technology Normal UniversityNanchang 330013China Jiangxi Province Key Laboratory of Flexible Electronics Nanchang 330013China Jiangxi Provincial Engineering Research Center for Waterborne Coatings Nanchang 330013China School of Materials and Energy Jiangxi Science&Technology Normal UniversityNanchang 330013China Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China Schoolof Physics and TechnologyWuhan UniversityWuhan 430072China

Conductive polymer composites(CPCs)are widely used in the field of organic electronics as the material basis of high-performance devices,due to their obvious advantages including electrical conductivity,lightness,processability and so *** on CPCs has focused on the enhancement of their electrical features and the exploration of their application prospects from conventional fields to heated emerging areas like flexible,stretchable,wearable,biological and biomedical electronics,where their mechanical properties are quite critical to determine their practical device ***,a main challenge to ensure their safety and reliability is on the synergistic enhancement of their electrical behavior and mechanical ***,we systematically review the research progress of CPCs with different conductive fillers(metals and their oxides,carbon-based materials,intrinsically conductive polymers,MXenes,etc.)relying on rich material forms(hydrogel,aerogel,fiber,film,elastomer,etc.)in terms of mechanical property regulation strategies,mainly relying on optimized composite material systems and processing techniques.A summary and prospective overview of current issues and future developments in this field also has been presented.

关键词： Conductive polymer Composite Mechanical property Electrical conductivity Organic electronics

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Thermodynamic effects of pulsed laser multilayer thin film etching 3

Thermodynamic effects of pulsed laser multilayer thin film e...

引用

3rd Optics Frontier Conference, OFS 2023

作者： Liu, Xiaoli Zhou, Licheng Liu, Wending Zhou, Yifan Xiong, Yuqing Wang, Jizhou School of Energy Engineering Yulin University Shaanxi Province Yulin719000 China School of Mechanical and Electronic Engineering Guilin University of Electronic Technology Guilin541004 China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou730000 China

ISBN: (纸本)9781510666450

The impact of the interface effect on the etching accuracy of a non-single-layer structure was utilized as a starting point in this work to analyze the correlation between the integrated structure's film surface/interface temperature field, stress field distribution, and interface mutation. Based on single-factor etching experiments, the relationship between the temperature field, stress field, and laser characteristic parameters was evaluated via a combination of theoretical analysis and numerical simulation. For polyimide-based metal aluminum film, a connection between scanning speed and etching characteristic parameters was discovered. The results illustrate that when Al/PI (aluminum film thickness of 2μm) was irradiated by a laser, the interface temperature reached a certain value, which caused distortion of the film and substrate. Changes in the distribution of the temperature and stress fields of the film affect the heat transfer in the system and thus affect the thermodynamic trajectory, thermal feedback, etching rate, and shape of the target film surface. Ultimately, the etching and removal of the Al/PI integration of the non-single-layer structure are attributed to the interplay of thermal and stress field effects. © 2023 SPIE.

关键词： Etching

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Electronic characteristic,tensile cracking behavior and potential energy surface of TiC(111)/Ti(0001)interface:A first principles study

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Chinese Journal of Aeronautics 2023年第9期36卷 451-463页

作者： Silong ZHANG Jibo WANG Lixiang RAO Qizhen HE Xiaolei XING Yefei ZHOU Qingxiang YANG State Key Lab of Metastable Materials Science&Technology Hebei Key Lab for Optimizing Metal Product Technology and PerformanceCollege of Materials Science&EngineeringYanshan UniversityQinhuangdao 066004China College of Physics and Mechanical&Electrical Engineering Longyan UniversityLongyan 364012China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

The preparation of TiC coating on Ti alloy surface to improve the wear resistance has attracted attention from researchers in aerospace *** service life of TiC coating is related to the interfacial adhesion properties between TiC coating and Ti alloy ***,it is difficult to explain its interfacial adhesion mechanism by experimental *** on the termination of atoms on the TiC surface,two TiC/Ti interface models named as the C-terminated-TiC(111)/Ti(0001) and Ti-terminated-TiC(11)/Ti(0001) interface were constructed by *** interfacial electronic characteristic of C-Ti bond is a mixture of polar covalent and metal bonds,and that of Ti-Ti bond is the metal *** tensile strains of both C-terminated-TiC(111)/Ti(0001) and Ti-terminated-TiC(111)/Ti(0001) interface in the fracture stage are ranged from 12% to 14%.Their maximum tensile stresses are 16.201 GPa and 15.590GPa,*** sliding potential energy surface maximum of C-terminated-TiC(111)/Ti(0001) and Ti-terminated-TiC(111)/Ti(0001) interface are 5.387 J/m^(2) and 0.271 J/m^(2),*** the sliding potential barriers on the minimum energy path are 2.094 J/m2and 0.136 J/m^(2) with an ideal shear strength of 20.32 GPa and 1.61 GPa,*** summary,the interfacial adhesion property of C-terminated-TiC(111)/Ti(0001) interface is better than that of Ti-terminated-TiC(111)/Ti(0001) interface.

关键词： Electronic First-principles Potential energy surface Tensile TiC/Ti interface

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Polymer microbottle with flexible tunability for ultrasensitive ultrasound sensing

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science China(physics,Mechanics & Astronomy) 2025年第3期68卷 124-130页

作者： Liaosha Kuang Jialve Sun Shengnan Huangfu Tinglan Chen Zijing Cai Tian Xu Xuanyi Zhang Bo Ni Fangxing Zhang School of Physics and Technology Nantong UniversityNantong226019China Peking University Yangtze Delta Institute of Optoelectronics Nantong226010China State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing100871China School of Electronic Information Engineering Shanghai DianJi UniversityShanghai201306China

Optical whispering-gallery-mode microcavities have attracted significant attention for their potential in ultrasensitive ultrasound sensing,despite always relying on expensive tunable lasers in *** this study,we integrated an electrothermal tuning function inside the microcavity,enabling fast scanning of modes by applying voltages,which helps provide real-time searching and tracking of the optimal *** device demonstrated a quality factor exceeding 10^(6)with a broad tuning range over 33 *** structure achieved high sensitivity in ultrasound detection,with a noise equivalent pressure(NEP)of 3.35 m Pa/Hz^(1/2)at 20 *** further reported the advantages of the mode thermal broadening effect for ultrasound detection,with successfully obtaining high-contrast photoacoustic *** research introduces an innovative approach for cost-effective,high-stability ultrasound detection with microcavity,showing great value for application in photoacoustic imaging.

关键词： microbottle broad tuning range ultrasound detection photoacoustic imaging

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Development of Metrological-grade Spinning Rotor Gauge

Development of Metrological-grade Spinning Rotor Gauge

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International Conference on vacuum Electronics

作者： Zhenhua Xi Meiru Guo Wenjie Jia Zhengyi Ren Huzhong Zhang Yongjun Cheng Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou China

The spinning rotor gauge is an internationally recognized high vacuum transfer standard. It is widely used in aerospace, nuclear industry, semiconductor and other fields because of its excellent metrological characteristics and chemical inertness. In order to realize the international equivalence of vacuum quantity in China's science and technology industry. Through the continuous research of key technologies, such as high-quality suspension based on permanent magnet, accurate measurement of axial displacement, residual drag suppression, construction of kinetic model of rotational speed decay rate and high precision detection, the metrological-grade spinning rotor vacuum gauge has been developed. The change of residual drag is less than 0.49 % after 50 minutes of start-up. There is good consistency and linearity in the range of 9 × 10 -5 Pa to 1 Pa.

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Theoretical insight into stabilities and optoelectronic properties of RbZnX3 (X=Cl, Br) halide perovskites for energy conversion applications

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Optical and Quantum Electronics 2025年第1期57卷 1-21页

作者： Khan, Naimat Ullah Ghani, Usman khan, Arshad Khan, Asif Nawaz Ullah, Khadim Ali, Roshan Fadhali, Mohammed M. Department of Physics Materials Modeling and Simulation Lab University of Science & Technology Bannu Khyber Pakhtunkhwa Bannu28100 Pakistan Department of Physics University of Science & Technology Bannu Khyber Pakhtunkhwa Bannu28100 Pakistan Theoretical Condensed Matter Physics and Computational Materials Physics Laboratory College of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Department of Physical Sciences Physics Division College of Science Jazan University P.O. Box. 114 Jazan45142 Saudi Arabia

Owing to the interesting physical characteristics of perovskites, herein, we investigate RbZnX3 (X = Cl, Br) halide perovskites for sustainable green energy applications. All the given structures were made relaxed and minimum energy was attained by employing Birch-Muranghan equation of state. The electronic band structure of the under study materials were calculated through modified-Beck-Johnson potential. Our results showed that all the investigated RbZnX3 (X = Cl, Br) perovskites are semiconductors with band gaps of 1.34, and 0.12 eV, respectively. The calculated tolerance factors, formation energies, Born-Hung criteria, phonon spectra and ab initio molecular dynamic (AIMD) simulations demonstrated that the given compounds exhibit geometrical, thermodynamic, mechanical, dynamic and thermal stabilities. Findings of elastic investigation revealed an elastic, anisotropic, and ductile nature of our predicted compounds. Moreover, all the studied materials revealed strong absorption – 104 cm−1 in the visible and ultraviolet spectrum and the device absorption efficiency (%) was found comparable to other known reported materials. Overall, this study demonstrates that our simulated perovskites are suitable candidates for photovoltaic and optoelectronic applications. © The Author(s), under exclusive licence to Springer science+Business Media, LLC, part of Springer Nature 2025.

关键词： Bromine compounds

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The optimization of a miniature mattauch herzog mass spectrometer

The optimization of a miniature mattauch herzog mass spectro...

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International Conference on vacuum Electronics

作者： Zhengyi Ren Meiru Guo Zhe Yang Gang Li Jian Geng Yongjun Cheng Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou China

In recent years, miniature mass spectrometer (MS) play an important role in the space exploration and environmental monitoring fields. In this paper, A miniature Mattauch-Herzog double focusing mass spectrometer is developed for mass analysis. The software SIMION8.1 is mainly used to study the fringing field of the magnetic analyzer where the magnetic flux density is 0.85T. From that, we know the distribution of the fringing field can be greatly compressed by adding ideal magnetic shielding material at the entrance of the magnetic analyzer. Besides, the experiment shows the instrument has a good performance and the mass resolution of He is 39.643.

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