检索结果-内蒙古大学图书馆

Long-time evolution of charged grains in plasma under harmonic external force and after being withdrawn

Chinese physics B 2022年第2期31卷 460-464页

作者： Miao Guan Zhi-Dong Chen Meng-Die Li Zhong-Mao Liu You-Mei Wang Ming-Yang Yu Department of Physics School of ScienceHangzhou Dianzi UniversityHangzhou 310016China College of Engineering Physics CAMDTShenzhen Key Laboratory of Ultraintense Laser and Advanced Material TechnologyShenzhen Technology UniversityShenzhen 518118China Institute for Fusion Theory and Simulation Zhejiang UniversityHangzhou 310007China Theoretical Physics I Ruhr UniversityBochum D-44780Germany

Evolution of the charged grains in a two-dimensional dusty plasma under a spatially harmonic external force,in particular,their long-time behaviors after the force has been withdrawn,is studied by using molecular dynamics *** an external force and a grain–grain interaction force,initially homogeneously distributed grains can reach a quasistationary state in the form of a disk *** the external force is withdrawn,the disk moves initially with its size and shape nearly unchanged until it rapidly stops moving,and eventually the disk grain rotates like a *** time needed to reach the final state increases with the strength of the initial external force increasing.

关键词： dusty plasma external force long-time behavior molecular dynamics(MD)simulation

来源：评论

学校读者我要写书评

暂无评论

Over 18.2% efficiency of layer–by–layer all–polymer solar cells enabled by homoleptic iridium(Ⅲ)carbene complex as solid additive

引用

science Bulletin 2024年第18期69卷 2862-2869页

作者： Hang Zhou Yingjie Sun Miao Zhang Yuheng Ni Fenghua Zhang Sang Young Jeong Tianhuan Huang Xiong Li Han Young Woo Jian Zhang Wai-Yeung Wong Xiaoling Ma Fujun Zhang Key Laboratory of Luminescence and Optical Information(Ministry of Education) Beijing Jiaotong UniversityBeijing 100044China Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHong Kong 999077China Department of Physics Beijing Technology and Business UniversityBeijing 100048China Organic Optoelectronic Materials Laboratory Department of ChemistryCollege of ScienceKorea UniversitySeoul 02841Republic of Korea School of Materials Science and Engineering Engineering Research Center of Electronic Information Materials and DevicesMinistry of EducationGuangxi Key Laboratory of Information MaterialsGuilin University of Electronic TechnologyGuilin 541004China Tangshan Research Institute of Beijing Jiaotong University Tangshan 063000China

The vertical phase distribution of active layers plays a vital role in balancing exciton dissociation and cha rge transport for achieving efficient polymer solar cells(PSCs).The layer-by-layer(LbL)PSCs are commonly prepared by using sequential spin-coating method from donor and acceptor solutions with distinct solvents and solvent *** enhanced exciton dissociation is expected in the LbL PSCs with efficient charge transport in the relatively neat donor or acceptor *** this work,a series of LbL all-polymer solar cells(APSCs)were fabricated with PM6 as donor and PY-DT as acceptor,and triplet material m-Ir(CPmPB)_(3)is deliberately incorporated into PY-DT layer to prolong exciton lifetimes of active *** power conversion efficiency(PCE)of LbL APSCs is improved to 18.24%from 17.32%by incorporating 0.3 wt%m-Ir(CPMPB)_(3)in PY-DT layer,benefiting from the simultaneously enhanced short-circuit current density(Isc)of 25.17 mA cm^(-2)and fill factor(FF)of 74.70%.The enhancement of PCE is attributed to the efficient energy transfer of m-Ir(CPmPB)_(3)to PM6 and PY-DT,resulting in the prolonged exciton lifetime in the active layer and the increased exciton diffusion *** efficient energy transfer from m-Ir(CPmPB)_(3)to PM6 and PY-DT layer can be confirmed by the increased photoluminescence(PL)intensity and the prolonged PL lifetime of PM6 and PY-DT in PM6+m-Ir(CPmPB)_(3)and PY-DT+m-Ir(CPmPB)_(3)*** study indicates that the triplet material as solid additive has great potential in fabricating efficient LbL APSCs by prolonging exciton lifetimes in active layers.

关键词： Layer-by-layer All-polymer solar cells Additive strategy Triplet material Energy transfer

来源：评论

学校读者我要写书评

暂无评论

Sign-reversible valley-dependent Berry phase effects in 2D valley-half-semiconductors

引用

npj Computational Materials 2021年第1期7卷 1435-1441页

作者： Xiaodong Zhou Run-Wu Zhang Zeying Zhang Wanxiang Feng Yuriy Mokrousov Yugui Yao Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of Technology100081 BeijingChina Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of Technology100081 BeijingChina College of Mathematics and Physics Beijing University of Chemical Technology100029 BeijingChina Peter Grünberg Institut and Institute for Advanced Simulation Forschungszentrum Jülich and JARA52425 JülichGermany Institute of Physics Johannes Gutenberg University Mainz55099 MainzGermany

Manipulating valley-dependent Berry phase effects provides remarkable opportunities for both fundamental research and practical ***,by referring to effective model analysis,we propose a general scheme for realizing topological magneto-valley phase *** importantly,by using valley-half-semiconducting VSi2N4 as an outstanding example,we investigate sign change of valley-dependent Berry phase effects which drive the change-in-sign valley anomalous transport characteristics via external means such as biaxial strain,electric field,and correlation *** a result,this gives rise to quantized versions of valley anomalous transport *** findings not only uncover a general framework to control valley degree of freedom,but also motivate further research in the direction of multifunctional quantum devices in valleytronics and spintronics.

关键词： Berry phase reversible

来源：评论

学校读者我要写书评

暂无评论

Improved description of nuclear charge radii: Global trends beyond N=28 shell closure

引用

Physical Review C 2024年第6期109卷 064302-064302页

作者： Rong An Xiang Jiang Na Tang Li-Gang Cao Feng-Shou Zhang School of Physics Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and Technology College of Physics and Optoelectronic Engineering Key Laboratory of Beam Technology of Ministry of Education Institute of Radiation Technology Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China

Charge radii measured with high accuracy provide a stringent benchmark for characterizing nuclear structure phenomena. In this work, the systematic evolution of charge radii for nuclei with Z=19–29 is investigated through relativistic mean-field theory with effective forces NL3, PK1, and NL3*. The neutron-proton (np) correlation around Fermi surface originated from the unpaired neutron and proton has been taken into account tentatively in order to reduce the overestimated odd-even staggering of charge radii. This improved method can give an available description of charge radii across N=28 shell closure. A remarkable observation is that the charge radii beyond N=28 shell closure follow the similarly steep increasing trend, namely irrespective of the number of protons in the nucleus. Especially, the latest results of charge radii for nickel and copper isotopes can be reproduced remarkably well. Along N=28 isotonic chain, the sudden increase of charge radii is weakened across Z=20, but presented evidently across Z=28 closed shell. The abrupt changes of charge radii across Z=22 are also shown along N=32 and 34 isotones, but the latter with a less slope. This seems to provide a sensitive indicator to identify the new magicity of a nucleus with universal trend of charge radii.

关键词： Nuclear charge radii Nuclear structure & decays

来源：评论

学校读者我要写书评

暂无评论

Intrinsic in-plane nodal chain and generalized quaternion charge protected nodal link in photonics

引用

Light(science & Applications) 2021年第5期10卷 881-889页

作者： Dongyang Wang Biao Yang Qinghua Guo Ruo-Yang Zhang Lingbo Xia Xiaoqiang Su Wen-Jie Chen Jiaguang Han Shuang Zhang C.T.Chan Department of Physics Hong Kong University of Science and TechnologyHong KongChina College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangshaChina Institute for Advanced Study Hong Kong University of Science and TechnologyHong KongChina Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education School of Physics and ElectronicsHunan UniversityChangshaChina Institute of Solid State Physics and Department of Physics Shanxi Datong UniversityDatongChina School of Physics&State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen UniversityGuangzhouChina Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin University and the Key Laboratory of Optoelectronics Information and Technology(Ministry of Education)TianjinChina School of Physics&Astronomy University of BirminghamBirminghamUK

Nodal lines are degeneracies formed by crossing bands in three-dimensional momentum ***,these degenerate lines can chain together via touching points and manifest as nodal *** nodal chains are usually embedded in two orthogonal planes and protected by the corresponding mirror ***,we propose and demonstrate an in-plane nodal chain in photonics,where all chained nodal lines coexist in a single mirror plane instead of two orthogonal *** lines are degeneracies formed by crossing bands in three-dimensional momentum ***,these degenerate lines can chain together via touching points and manifest as nodal *** nodal chains are usually embedded in two orthogonal planes and protected by the corresponding mirror ***,we propose and demonstrate an in-plane nodal chain in photonics,where all chained nodal lines coexist in a single mirror plane instead of two orthogonal *** chain point is stabilized by the intrinsic symmetry that is specific to electromagnetic waves at theГpoint of zero *** adding another mirror plane,we find a nodal ring that is constructed by two higher bands and links with the in-plane nodal *** nodal link in momentum space exhibits non-Abelian characteristics on a C_(2)T-invariant plane,where admissible transitions of the nodal link structure are determined by generalized quaternion *** near-field scanning measurements of bi-anisotropic metamaterials,we experimentally mapped out the in-plane nodal chain and nodal link in such *** chain point is stabilized by the intrinsic symmetry that is specific to electromagnetic waves at the r point of zero *** adding another mirror plane,we find a nodal ring that is constructed by two higher bands and links with the in-plane nodal *** nodal link in momentum space exhibits non-Abelian characteristics on a C2T-invariant plane,where admissible transitions of the nodal link structure are determ

关键词： nodal plane mirror

来源：评论

学校读者我要写书评

暂无评论

Carrier recombination suppression and transport enhancement enable high-performance self-powered broadband Sb_(2)Se_(3) photodetectors

引用

InfoMat 2023年第4期5卷 60-76页

作者： Shuo Chen Yi Fu Muhammad Ishaq Chuanhao Li Donglou Ren Zhenghua Su Xvsheng Qiao Ping Fan Guangxing Liang Jiang Tang Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenGuangdongthe People's Republic of China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanningGuangxithe People's Republic of China State Key Laboratory of Silicon Materials&School of Materials Science and Engineering Zhejiang UniversityHangzhouZhejiangthe People's Republic of China Wuhan National Laboratory for Optoelectronics(WNLO) School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhanHubeithe People's Republic of China

Antimony selenide(Sb_(2)Se_(3))is a promising candidate for photodetector applications boasting unique material benefits and remarkable optoelectronic *** high-performance self-powered Sb_(2)Se_(3)photodetector through a synergistic regulation of absorber layer and heterojunction interface demonstrates great potential and needs essential *** this study,an effective two-step thermodynamic/kinetic deposition technique containing sputtered and selenized Sb precursor is implemented to induce self-assembled growth of Sb_(2)Se_(3)light absorbing thin film with large crystal grains and desirable[hk1]orientation,presenting considerable thin-film photodetector ***,aluminum(Al^(3+))cation dopant is introduced to modify the optoelectronic properties of CdS buffer layer,and further optimize the Sb_(2)Se_(3)/CdS(Al)heterojunction interface *** to the suppressed carrier recombination and enhanced carrier transport kinetics,the champion Mo/Sb_(2)Se_(3)/CdS(Al)/ITO/Ag photodetector exhibits self-powered and broadband characteristics,accompanied by simultaneously high responsivity of 0.9 A W^(-1)(at 11 nW cm^(-2)),linear dynamic range of 120 dB,impressive ON/OFF switching ratio over 10^(6)and signal-to-noise ratio of 10^(9),record total noise determined realistic detectivity of 4.78×10^(12)Jones,and ultra-fast response speed with rise/decay time of 24/75 ns,representing the top level for Sb_(2)Se_(3)-based *** intriguing work opens up an avenue for its selfpowered broadband photodetector applications.

关键词： photoresponse recombination suppression Sb_(2)Se_(3) self-powered photodetector transport enhancement

来源：评论

学校读者我要写书评

暂无评论

Intrinsic polarization conversion and avoided-mode crossing in X-cut lithium niobate microrings

引用

Chinese physics B 2024年第6期33卷 398-403页

作者：谭泽林张检发朱志宏陈伟邵铮铮刘肯秦石乔 College of Advanced Interdisciplinary Studies&Hunan Provincial Key Laboratory of Novel Nano Optoelectronic Information Materials and Devices National University of Defense TechnologyChangsha 410073China Nanhu Laser Laboratory National University of Defense TechnologyChangsha 410073China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China School of Physics Central South UniversityChangsha 410083China

Compared with well-developed free space polarization converters, polarization conversion between TE and TM modes in the waveguide is generally considered to be caused by shape birefringence, like curvature, morphology of waveguide cross section and scattering. Here, we study the polarization conversion mechanism in 1-THz-FSR X-cut lithium niobate microrings with multiple-resonance condition, that is the conversion can be implemented by birefringence of waveguides,which will also introduce an avoided-mode crossing. In the experiment, we find that this mode crossing results in severe suppression of one sideband in local nondegenerate four-wave mixing and disrupts the cascaded four-wave mixing on this side. Simultaneously, we propose one two-dimensional method to simulate the eigenmodes(TE and TM) in X-cut microrings, and the mode crossing point. This work will provide one approach to the design of polarization converters and simulation for monolithic photonics integrated circuits, and may be helpful to the studies of missed temporal dissipative soliton formation in X-cut lithium niobate rings.

关键词： polarization conversion birefringence nondegenerate four-wave mixing

来源：评论

学校读者我要写书评

暂无评论

Large enhancement of magnetocaloric effect induced by dual regulation effects of hydrostatic pressure in Mn_(0.94)Fe_(0.06)NiGe compound

引用

Journal of Materials science & technology 2022年第19期114卷 73-80页

作者： He Zhou Dekun Wang Zhe Li Junzhuang Cong Ziyuan Yu Shuo Zhao Peng Jiang Daoyong Cong Xinqi Zheng Kaiming Qiao Hu Zhang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China College of Physics and Electronic Engineering Key Laboratory for Advanced Functional and Low Dimensional Materials of Yunnan Higher Education InstituteQujing Normal UniversityQujing 655011China MultiFields Technologies(Beijing)Co.Ltd. Beijing 100190China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

MM'X(M,M'=transition metals,X=carbon or boron group elements)compounds could exhibit large magnetocaloric effect due to the magnetostructural transition,and the composition regulation has been widely studied to realize the magnetostructural ***,the magnetostructural transition is also sensitive to the ***,the effect of hydrostatic pressure on magnetostructural transformation and magnetocaloric effect has been investigated in Mn_(0.94)Fe_(0.06)NiGe *** regulation effect of lowering structural transition temperature and strengthening ferromagnetic(FM)state of martensite is realized by applying hydrostatic pressure,which would greatly improve the magnetocaloric effect of Mn_(0.94)Fe_(0.06)NiGe ***,the first-principles calculations have also been performed to discuss the origin of the regulation effect under hydrostatic pressure,and it indicates that the hydrostatic pressure can stabilize the hexagonal structure and decrease the structural transition *** maximum isothermal entropy change increases by 109%from 4.3 J/(kg K)under 0 GPa to 9.0 J/(kg K)under 0.402 GPa for a magnetic field change of 0-3 *** work proves that the hydrostatic pressure is an effective method to regulate the magnetostructural transition and enhance magnetocaloric effect in MM'X compounds.

关键词： Magnetocaloric effect Magnetostructural transition Hydrostatic pressure Magnetic properties

来源：评论

学校读者我要写书评

暂无评论

Interfacial behavior of a thermoelectric film bonded to a graded substrate

引用

Applied Mathematics and Mechanics(English Edition) 2023年第11期44卷 1853-1870页

作者： Juan PENG Dengke LI Zaixing HUANG Guangjian PENG Peijian CHEN Shaohua CHEN School of Materials Science and Physics State Key Laboratory for Geomechanics and Deep Underground EngineeringSchool of Mechanics and Civil EngineeringChina University of Mining and TechnologyXuzhou 221116Jiangsu ProvinceChina State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310014China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures Beijing Institute of TechnologyBeijing 100081China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing Institute of TechnologyBeijing 100081China

To improve the thermoelectric converting performance in applications such as power generation,reutilization of heat energy,refrigeration,and ultrasensitive sensors in scramjet engines,a thermoelectric film/substrate system is widely designed and applied,whose interfacial behavior dominates the strength and service life of thermoelectric ***,a theoretical model of a thermoelectric film bonded to a graded substrate is *** interfacial shear stress,the normal stress in the thermoelectric film,and the stress intensity factors affected by various material and geometric parameters are comprehensively *** is found that adjusting the inhomogeneity parameter of the graded substrate,thermal conductivity,and current density of the thermoelectric film can reduce the risk of interfacial failure of the thermoelectric film/graded substrate *** a stiffer and thicker thermoelectric film is advantageous to the reliability of the thermoelectric film/graded substrate *** results should be of great guiding significance for the present and upcoming applications of thermoelectric materials in various fields.

关键词： thermoelectric film graded substrate interfacial behavior singular integral equation shear stress intensity factor

来源：评论

学校读者我要写书评

暂无评论

Templated synthesis of patterned gold nanoparticle assemblies for highly sensitive and reliable SERS substrates

引用

Nano Research 2023年第4期16卷 5056-5064页

作者： Jianping Peng Peijiang Liu Yutong Chen Zi-Hao Guo Yanhui Liu Kan Yue South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou 510640China National Key Laboratory for Reliability Physics and Its Application Technology of Electrical Component the 5th Electronics Research Institute of the Ministry of Information IndustryGuangzhou 510610China College of Textiles&Clothing Laboratory of New Fiber Materials and Modern TextileState Key laboratory of Bio-Fibers and Eco-TextilesQingdao UniversityQingdao 266000China

Formation of plasmonic structure in closely packed assemblies of metallic nanoparticles(NPs)is essential for various applications in sensing,renewable energy,authentication,catalysis,and ***,a surface-enhanced Raman scattering(SERS)substrate is fabricated for trace detection with ultrahigh sensitivity and *** SERS substrate is constructed from a simple yet robust strategy through in situ growth patterned assemblies of Au NPs based on a polymer brush templated synthesis *** from the dense and uniform distribution of Au NPs,the resulting Au plasmonic nanostructure demonstrates a very strong SERS effect,while the outer polymer brush could restrict the excessive growth of Au NPs and the patterned design could achieve uniform distribution of Au *** results,an ultra-low limit of detection(LOD)of 10^(−15)M,which has never been successfully detected in other work,is determined for 4-acetamidothiophenol(4-AMTP)molecules and the Raman signals in the random region show good signal homogeneity with a low relative standard deviation(RSD)of 7.2%,indicating great sensitivity and reliability as a SERS *** LOD values of such Au plasmonic nanostructures for methylene blue,thiram,and R6G molecules can also reach as low as 10^(−10)M,further indicating that the substrate has a wide range of applicability for SERS *** the help of finite difference time domain simulations(FDTD)calculation,the electric field distribution of the Au plasmonic nanostructures is simulated,which quantitatively matches the experimental ***,the Au plasmonic nanostructures show good shelf stability for at least 10 months of storage in an ambient environment,indicating potentials for practical applications.

关键词： templated synthesis patterned Au nanostructures surface-enhanced Raman scattering polymer brush plasmonic nanostructures

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：