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Alloying-engineered high-performance broadband polarized Bi_(1.3)In_(0.7)Se_(3)photodetector with ultrafast response

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Nano Research 2022年第9期15卷 8451-8457页

作者： Fen Zhang Yali Yu Zhangxun Mo Le Huang Qinglin Xia Bo Li mianzeng zhong Jun He Hunan Key Laboratory of Nanophotonics and Devices School of Physics and ElectronicsCentral South UniversityChangsha 410083China State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences&Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100083China School of Material and Energy Guangdong University of TechnologyGuangzhou 510006China Department of Applied Physics School of Physics and ElectronicsHunan UniversityChangsha 410082China

Topological insulators have important potential for applications in the field of nano/micro-optoelectronic ***,the large dark current seriously hinders the improvement of device *** is an important means to control the physical properties of topological *** this work,we have designed and prepared Bi_(1.3)In_(0.7)Se_(3)*** optoelectronic properties of the individual Bi_(1.3)In_(0.7)Se_(3)nanowire-based photodetector are systematically *** photodetector is very sensitive to broadband wavelength from solar-blind ultraviolet C(254 nm)to near-infrared(1,064 nm),showing superior optoelectrical properties with photoresponsivity of 241.3 A·W^(–1)and detectivity of 1.18×10^(12)Jones at 638 ***,the photodetector demonstrates ultrafast photoresponse characteristics with a photoresponse time of about 770 ns,which is 3 to 6 orders of magnitude lower than other compound semiconductors based on Bi or In reported so *** addition,it also exhibits good polarization sensitivity in a broadband range from ultraviolet C(266 nm)to near-infrared(1,064 nm)and obtained the maximum dichroic ratio is 1.73 at 1,064 *** results suggest that this platform creates new opportunities for the development of low-cost,high-sensitivity,high-speed,and broadband angle-sensitive photodetectors.

关键词： photodetectors alloying of Bi_(1.3)In_(0.7)Se_(3) broadband ultrafast response polarization

Intercalation of Two-dimensional Layered Materials

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Chemical Research in Chinese Universities 2020年第4期36卷 584-596页

作者： ZHOU Xinyun YANG Juehan zhong mianzeng XIA Qinglin LI Bo DUAN Xidong WEI zhongming Hunan Key Laboratory of Two-dimensional Materials Department of Applied PhysicsSchool of Plhvsics and ElectronicsHunan UiniversitChangsha 410082.P R.China Hunan Key Laboratory of Two-dimensional Materials and State Key Laboratory for Chemo Biosensing and Chemometrics College of Chemistrv and Chemical Engineering Hunan UniversityChangsha 410082P.R.China State Key Laboratorv of Superlattices and Microstructures Institute of SemiconductorsChinese Academv ofSciences&College ofMaterials Science and Oplo-Electronic Technology Lniversity of Chinese Academv ofSciencesBeijing 100083P R.China School of Physics and Electronics Central South Universiny Changsha 410083P R.China

Two-dimensional(2D)layered materials have attracted great attention due to their unique electrical,optical,thermal and mechanical properties.2D layered materials have miique van der Waals gaps,thus the foreign substance,such as atoms,molecules and ions,can be inserted into the gaps to change the physical and chemical properties of 2D layered materials,which is conducive to realize their multi-fimctional ***,we present a critical review of recent research progress of 2D intercalated materials,including the synthesizing metliods,theoretical calculation,characterization and multifunctional ***,we will summarize llie current challenges and future opportunities in the development of 2D intercalated materials.

关键词： Two-dimensional layered material Intercalation Multi-functional application

A new single-element layered two-dimensional semiconductor:black arsenic

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Journal of Semiconductors 2020年第8期41卷 6-7页

作者： mianzeng zhong Jun He Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

The discovery of graphene,the first two-dimensional material with a thickness of an atomic layer,opened the prelude to the development of other atom-thin two-dimensional layered *** are considered to be one of the best candidates to extend Moore’s ***,graphene is a zero-bandgap semimetal,which limits its application in logic circuits[1].

关键词： materials. layered dimensional

The Coulomb interaction in van der Waals heterostructures

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Science China(Physics,Mechanics & Astronomy) 2019年第3期62卷 102-107页

作者： Le Huang mianzeng zhong HuiXiong Deng Bo Li zhongMing Wei JingBo Li SuHuai Wei School of Materials and Energy Guangdong University of Technology State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors University of Chinese Academy of Sciences Department of Applied Physics School of Physics and Electronics Hunan University Beijing Computational Science Research Center

The giant Stark effect(GSE) in a set of van der Waals(vdW) heterostructures is studied using first-principles methods. A straightforward model based on quasi-Fermi levels is proposed to describe the influence of an external perpendicular electric field on both band gap and band edges. Although a general linear GSE is observed, which is induced by the almost linear variation of the band edges of each layer in the heterostructures, when vdW heterostructures is subjected to small electric fields the variation becomes nonlinear. This can be attributed to the band offsets-induced interlayer charge transfer and resulted intraand inter-layer Coulomb interactions. Our work, thus offers new insight into the mechanism of the nonlinear GSE in vdW heterostructures, which is important for the applications of vdW heterostructures on nanoelectronic devices.

关键词： van der Waals heterostructures gaint Stark effect Coulomb interaction charge transfer

Summer extreme precipitation patterns and synoptic-scale circulation precursors over the Tibetan Plateau

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Science China Earth Sciences 2024年第5期67卷 1625-1638页

作者： Zhiyuan DING Yao HA zhong zhong College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Key Laboratory for Virtual Geographic Environment School of Geography ScienceNanjing Normal UniversityNanjing 210023China Jiangsu Collaborative Innovation Center for Climate Change School of Atmospheric SciencesNanjing UniversityNanjing 210023China

In the context of global warming,the extreme summer precipitation over the Tibetan Plateau(TP)has changed *** this study,the summer(June–August)extreme precipitation on the TP was classified into three spatial types by applying the K-means clustering method to the Third Pole Region long time-series high-resolution(1/30°)precipitation dataset(TPHi Pr,1979–2020).The characteristics of the circulation anomalies and precursors corresponding to the extreme precipitation on the TP in summer during 1979–2020 were *** results showed that the summer extreme precipitation of the TP can be categorized into northwestern(NW),southeastern(SE),and southern Himalayan(HS)types based on extreme precipitation *** NW and SE types are mainly influenced by anomalous signals in the mid-to-high latitude regions upstream of them,whereas the HS type is controlled by the localized subtropical anomalous *** the 8th day before the onset of the NW type,an anomalous cyclone was observed in the western Atlantic Ocean(60°W,50°N),which triggered the west-to-east quasi-latitudinal propagation of Rossby *** the onset day of the NW type,the upper troposphere showed positive-negative-positive geopotential height anomalies along the latitudinal 40°N from the Caspian Sea,the western part of Xinjiang,to the northeastern *** entered from the Arabian Sea along the southeastern edge of the anomalous cyclone on the southwestern TP and converged in the northwestern *** to the NW type,the precursors of the SE type appeared at higher latitudes and were more *** the 8th day before the onset of the SE type,an anomalous cyclone occurred near Greenland(60°W,70°N)and excited Rossby waves propagating *** the onset day of the SE type,the upper troposphere showed negative-positive-negative geopotential height anomalies across Eurasia from the Ural Mountains and the Iranian Plateau to the northern TP in the northwest-southeast directi

关键词： Tibetan Plateau Summer extreme precipitation Atmospheric circulation anomaly Precursor Teleconnection wave train

Complete Universal Scaling in First-Order Phase Transitions

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Chinese Physics Letters 2024年第10期41卷 8-13页

作者： Fan zhong School of Physics and State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China

Phase transitions and critical phenomena are among the most intriguing phenomena in nature and *** are classified into first-order phase transitions(FOPTs)and continuous *** the latter shows marvelous phenomena of scaling and universality,whether the former behaves similarly is a long-standing controversial *** we definitely demonstrate complete universal scaling in field driven FOPTs for Langevin equations in both zero and two spatial dimensions by rescaling all parameters and subtracting nonuniversal contributions with singular dimensions from an effective temperature and a special field according to an effective *** offers a perspective different from the usual nucleation and growth but conforming to continuous phase transitions to study FOPTs.

关键词： theory. transitions scaling

Key issues on magnetic reconnection at Mercury

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Earth and Planetary Physics 2024年第5期8卷 673-685页

作者： Jun zhong Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences

Magnetic reconnection processes and their impact on planetary magnetospheric dynamics exhibit significant differences due to differences in upstream solar wind conditions and internal planetary environments. Current understanding of reconnection phenomena at Mercury is rooted in the MESSENGER mission. However, direct detection of reconnection remains rare. Here, we aim to assess the limitations of MESSENGER in detecting reconnection in Mercury's space and to discuss key issues of reconnection that will be addressed by BepiColombo, including the dynamics of magnetic flux ropes, particle acceleration, density asymmetric reconnection,IMF-driven near-tail structures, and potential modes of magnetospheric convection.

关键词： magnetic reconnection Mercury MESSENGER BepiColombo

Modeling and Simulation of Lithium Vacuum Evaporation Process Using COMSOL Multiphysics

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Journal of Thermal Science 2024年第1期33卷 86-100页

作者： LIAN Xuexin zhong Dawen Beijing Key Laboratory of Passive Nuclear Power Safety and Technology North China Electric Power UniversityBeijing 102206China

Based on the COMSOL Multiphysics simulation software,this study carried out modeling and numerical simulation for the evaporation process of liquid metal lithium in the vacuum free molecular flow *** motion of lithium atoms in the evaporation process was analyzed through a succession of *** on the available experimental values of the saturated vapor pressure of liquid metal lithium,the relationship between saturated vapor pressure and temperature of liquid lithium in the range of 600 K-900 K was obtained.A two-dimensional symmetric model(3.5 mm×20 mm) was established to simulate the transient evaporation process of liquid lithium at wall temperatures of 750 K,780 K,800 K,810 K,825 K,and 850 K,*** effects of temperature,the evaporation coefficient,back pressure,and length-to-diameter ratio on the evaporation process were studied;the variation trends and reasons of the molecular flux and the pressure during the evaporation process were *** the same time,the evaporation process under variable wall temperature conditions was *** research made the evaporation process of liquid lithium in vacuum molecular flow clearer,and provided theoretical support for the space reactor and nuclear fusion related fields.

关键词： free molecular flow saturated vapor pressure vacuum evaporation liquid lithium metal

Cardiovascular computed tomography in cardiovascular disease:An overview of its applications from diagnosis to prediction

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Journal of Geriatric Cardiology 2024年第5期21卷 550-576页

作者： zhong-Hua SUN Discipline of Medical Radiation Science Curtin Medical SchoolCurtin UniversityPerthAustralia Curtin Health Innovation Research Institute(CHIRI) Curtin UniversityPerth 6012Australia

Cardiovascular computed tomography angiography(CTA)is a widely used imaging modality in the diagnosis of cardiovascular *** in CT imaging technology have further advanced its applications from high diagnostic value to minimising radiation exposure to *** addition to the standard application of assessing vascular lumen changes,CTA-derived applications including 3D printed personalised models,3D visualisations such as virtual endoscopy,virtual reality,augmented reality and mixed reality,as well as CT-derived hemodynamic flow analysis and fractional flow reserve(FFRCT)greatly enhance the diagnostic performance of CTA in cardiovascular *** widespread application of artificial intelligence in medicine also significantly contributes to the clinical value of CTA in cardiovascular *** value of CTA has extended from the initial diagnosis to identification of vulnerable lesions,and prediction of disease extent,hence improving patient care and *** this review article,as an active researcher in cardiovascular imaging for more than 20 years,I will provide an overview of cardiovascular CTA in cardiovascular *** is expected that this review will provide readers with an update of CTA applications,from the initial lumen assessment to recent developments utilising latest novel imaging and visualisation *** will serve as a useful resource for researchers and clinicians to judiciously use the cardiovascular CT in clinical practice.

关键词： diagnosis cardiovascular prediction