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Brightening and controlling dark excitons in monolayer TMDCs

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Science China Materials 2018年第9期61卷 1245-1247页

作者： qing-hai tan Jun Zhang State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences CAS Center of Excellence in Topological Quantum Computation College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences

An exciton is a bound state formed by an excited electron and hole via the Coulomb *** bound states often play an important role in the optical properties of low dimensional materials such as quantum dots,nanowires an... 详细信息

关键词：激发态引力材料学量子点

Learning topological defects formation with neural networks in a quantum phase transition

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Communications in Theoretical Physics 2024年第5期76卷 68-76页

作者： Han-qing Shi hai-qing Zhang Center for Gravitational Physics Department of Space ScienceBeihang UniversityBeijing 100191China Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China

Neural networks possess formidable representational power,rendering them invaluable in solving complex quantum many-body *** they excel at analyzing static solutions,nonequilibrium processes,including critical dynamics during a quantum phase transition,pose a greater challenge for neural *** address this,we utilize neural networks and machine learning algorithms to investigate time evolutions,universal statistics,and correlations of topological defects in a one-dimensional transverse-field quantum Ising ***,our analysis involves computing the energy of the system during a quantum phase transition following a linear quench of the transverse magnetic field *** excitation energies satisfy a power-law relation to the quench rate,indicating a proportional relationship between the excitation energy and the kink ***,we establish a universal power-law relationship between the first three cumulants of the kink numbers and the quench rate,indicating a binomial distribution of the ***,the normalized kink-kink correlations are also investigated and it is found that the numerical values are consistent with the analytic formula.

关键词： neural networks machine learning transverse-field quantum Ising model kibble-zurek mechanism

Facile preparation of Fe/N-based biomass porous carbon composite towards enhancing the thermal decomposition of DAP-4

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Defence Technology（防务技术） 2024年第1期31卷 288-294页

作者： Er-hai An Xiao-xia Li Cun-juan Yu Ying-xin tan Zi-jun Fan qing-xia Li Peng Deng Xiong Cao School of Environment and Safety Engineering North University of ChinaTaiyuan030051PR China College of Safety and Emergency Management Engineering Taiyuan University of Science and TechnologyTaiyuan030024PR China

Fe/N-based biomass porous carbon composite(Fe/N-p Carbon) was prepared by a facile high-temperature carbonization method from biomass,and the effect of Fe/N-p Carbon on the thermal decomposition of energetic molecular perovskite-based material DAP-4 was *** porous carbonaceous materials was considered as the micro/nano support layers for in situ deposition of Fe/N ***/Np Carbon was prepared simply by the high-temperature carbonization *** was found that it showed the inherent catalysis properties for thermal decomposition of *** heat release of DAP-4/Fe/N-p Carbon by DSC curves tested had increased slightly,compared from DAP-4/Fe/N-p *** decomposition temperature peak of DAP-4 at the presence of Fe/N-p Carbon had reduced by 79°C from384.4°C(pure DAP-4) to 305.4°C(DAP-4/Fe/N-p Carbon-3).The apparent activation energy of DAP-4thermal decomposition also had decreased by 29.1 J/*** possible catalytic decomposition mechanism of DAP-4 with Fe/N-p Carbon was proposed.

关键词： Biomass materials Porous carbon DAP-4 Thermal decomposition Facile method

Cascade electrolysis and thermocatalysis: a reliable system for upgrading C1 to C4 hydrocarbons

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Rare Metals 2024年第1期43卷 410-412页

作者： Chao-Yue Sun Wen Li hai-qing Wang Institute for Advanced Interdisciplinary Research(iAIR) College of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China

The carbon cycle is important for maintaining a stable climate and carbon balance on Earth. Renewable-electricitydriven upcycling of carbon dioxide (CO_(2)) into value-added multi-carbon molecules is a potentially sus... 详细信息

关键词： cycling hydrocarbons enable

Isogeometric Analysis for the Arbitrary AFG Microbeam with Two-Phase Nonlocal Stress-Driven Model

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Acta Mechanica Solida Sinica 2024年第2期37卷 341-360页

作者： Pei-Liang Bian Zhaowei Liu hai qing Tiantang Yu Department of Engineering Mechanics Hohai UniversityNanjing211100China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing210016China

Scale effects play critical roles in the mechanical responses of *** isogeometric analysis was developed here to investigate the mechanical responses of an axially functionally graded *** Euler–Bernoulli beam model was utilized,and size effects in the structure were modeled with a stress-driven two-phase local/nonlocal integral *** governing equation of microstructures was given in an equivalent differential form with two additional constitutive boundary *** framework was verified and utilized to analyze the microbeam’s static and dynamic mechanical *** present work showed great potential for modeling various types of functionally graded microstructures.

关键词： Isogeometric analysis Size effect Functionally graded material Nonlocal theory Euler-Bernoulli beam

Layer-number dependent high-frequency vibration modes in few-layer transition metal dichalcogenides induced by interlayer couplings

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Journal of Semiconductors 2017年第3期38卷 53-58页

作者： qing-hai tan Xin Zhang Xiang-Dong Luo Jun Zhang Ping-Heng tan State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Jiangsu Key Laboratory of ASIC Design Nantong University

Two-dimensional transition metal dichalcogenides（TMDs） have attracted extensive attention due to their many novel *** atoms within each layer in two-dimensional TMDs are joined together by covalent bonds,while van der Waals interactions combine the layers *** makes its lattice dynamics layer-number *** evolutions of ultralow frequency（〈 50 cm^（-1）） modes,such as shear and layer-breathing modes have been ***,we review the layer-number dependent high-frequency（〉 50 cm^（-1）） vibration modes in few-layer TMDs and demonstrate how the interlayer coupling leads to the splitting of high-frequency vibration modes,known as Davydov *** Davydov splitting can be well described by a van der Waals model,which directly links the splitting with the interlayer *** review expands the understanding on the effect of interlayer coupling on the high-frequency vibration modes in TMDs and other two-dimensional materials.

关键词： transition metal dichalcogenides Raman spectroscopy interlayer coupling Davydov splitting van der Waals model

Breakdown of Raman selection rules by Frohlich interaction in few-layer WS_(2)

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Nano Research 2021年第1期14卷 239-244页

作者： qing-hai tan Yu-Jia Sun Xue-Lu Liu Kai-Xuan Xu Yuan-Fei Gao Shu-Liang Ren Ping-Heng tan Jun Zhang State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsCenter of Materials Science and Optoelectronics EngineeringCAS Center of Excellence in Topological Quantum ComputationUniversity of Chinese Academy of SciencesBeijing 100083China Beijing Academy of Quantum Information Science Beijing 100193China

The polarization selection rule of Raman scattering is crucial in symmetry analysis of elementary excitations in semiconductors and correlated electron *** we reported the observation of breakdown of Raman selection rules in few-layer WS_(2) by using resonant Raman *** the excitation energy is close to the dark A exciton state,we observed some infrared active modes and backscattering forbidden ***,we found that all observed phonon modes follow the same paralleled-polarization *** to the electron-phonon coupling near the band edge in WS_(2),we proposed a theoretical model based on the intraband Frohlich *** this case,the polarization response of the scattering signal is no longer determined by the original Raman tensor of scattered ***,it is determined by a new isotropic Raman tensor that generated from this intraband Frohlich interaction between dark A exciton and *** found that this theoretical model is in excellent agreement with the observed *** breakdown of Raman selection rules can violate the conventional limitations of the optical response and provide an effective method to control the polarization of Raman scattering signals in two-dimensional materials.

关键词： WS_(2) resonant Raman scattering dark exciton Raman section rules Frohlich interaction

Bibliometric study of sepsis-associated liver injury from 2000 to 2023

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World Journal of Gastroenterology 2024年第30期30卷 3609-3624页

作者： Zheng Zhang Xiao-Jiao tan hai-qing Shi Huan Zhang Jian-Bo Li Xue-Lian Liao Department of Critical Care Medicine West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Critical Care Medicine West China Tianfu Hospital of Sichuan UniversityChengdu 610200Sichuan ProvinceChina

BACKGROUND Sepsis-associated liver injury(SLI)is a severe and prevalent complication of *** To explore the literature on SLI via a bibliometric *** Reviews and articles correlated with SLI published from January 1,2000 to October 28,2023 were searched from the Web of Science Core ***,the searched data were analyzed using VOSviewer,CiteSpace,and R *** There were 787 publications involved in this paper,comprising 745 articles and 42 ***,the United States,and Germany are the primary publication sources in this *** related to SLI primarily focused on mechanisms of pathogenesis,as evidenced by analyzing keywords,references,and the counting of original *** studies mainly involved tumor necrosis factor alpha,inflammation,oxidative stress,and nuclear factor-kappa *** There is significant growth in the research on *** investigations primarily involve basic experiments that aimed at uncovering pathogenic *** to the analyzed literature,the identified pathogenic mechanisms and potential therapeutic targets serve as the foundation for translating findings from basic research to clinical applications.

关键词： Sepsis Liver injury Bibliometric analysis Cite space VOS viewer

Dual template-induced construction of three-dimensional porous SiO2/NC/Co-CNTs heterostructure with highly dispersed active sites for efficient oxygen evolution reaction

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Tungsten 2024年第3期6卷 585-595页

作者： hai-Qi Zhang Xiao-Jun Zeng qing-qing Zhang Zu-Liang Zhang Chu-Long Jin Rong-hai Yu School of Materials Science and Engineering Jingdezhen Ceramic University School of Materials Science and Engineering Beihang University

The development and exploration of efficient and economical electrocatalysts for oxygen evolution reaction（OER） represents the main bottleneck to unlocking a sustainable energy scenario based on elec trocataly tic water *** scale integration of three-dimensional（3D） porous heterostructure with highly dispersed active sites and good structural stability is ***,a dual template route is developed to construct the 3D porous SiO2/nitrogen-doped carbon（NC）/Co-carbon nano tubes（CNTs） hetero ***,the hard template（SiO2nano spheres） contributes to 3D porous structure,increases the specific surface area,and promotes the contact area of the *** the same time,the soft template（basic zinc carbonate） can control the growth of 1D CNTs and facilitate the exposure of the active ***,3D porous SiO2/NC/Co-CNTs hetero structure inherits highly dispersed Co nanoparticles coated by *** conductive channels and abundant N hetero atoms doping are reasonably constructed by a dual template ***,SiO2/NC/Co-CNTs catalyst provides an extraordinary activity for the OER in alkaline media,with a low overpotential of 298 mV at a current density of 10 mA·***,SiO2/NC/Co-CNTs hetero structure enables excellent long-term durability with a 10 mV decay in overpotential after 3000 cyclic voltammetry cycles,and 97% remain in current density over 20 *** is believed that this dual template strategy can provide a new and simple way to construct a highly dispersed active site in electrocatalysts.

关键词： Dual template High dispersion Porous heterostructure Conductive channels Oxygen evolution reaction