检索结果-内蒙古大学图书馆

Enhanced valley polarization in WSe_(2)/YIG heterostructures via interfacial magnetic exchange effect

Nano Research 2023年第7期16卷 10580-10586页

作者： Haihong Zheng Biao Wu Chang-Tian Wang Shaofei Li Jun He Zongwen Liu Jian-Tao Wang Guoqiang Yu Ji-An Duan Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518057China

Exploiting the valley degrees of freedom as information carriers provides new opportunities for the development of *** transition metal dichalcogenides(TMDs)with broken space-inversion symmetry exhibit emerging valley pseudospins,making them ideal platforms for studying valley ***,intervalley scattering of different energy valleys limits the achievable degree of valley ***,we constructed WSe_(2)/yttrium iron garnet(YIG)heterostructures and demonstrated that the interfacial magnetic exchange effect on the YIG magnetic substrate can enhance valley polarization by up to 63%,significantly higher than that of a monolayer WSe_(2)on SiO_(2)/Si(11%).Additionally,multiple sharp exciton peaks appear in the WSe_(2)/YIG heterostructures due to the strong magnetic proximity effect at the magnetic-substrate interface that enhances exciton emission ***,under the effect of external magnetic field,the magnetic direction of the magnetic substrate enhances valley polarization,further demonstrating that the magnetic proximity effect regulates valley *** results provide a new way to regulate valley polarization and demonstrate the promising application of magnetic heterojunctions in magneto-optoelectronics.

关键词： magnetic exchange effect valley polarization two-dimensional valleytronics magnetic substrate

来源：评论

学校读者我要写书评

暂无评论

Substrate-dependent Growth of CH3NH3PbI3Films Deposited by Vacuum Evaporation 8

Substrate-dependent Growth of CH3NH3PbI3Films Deposited by V...

引用

8th Annual International Conference on Material Science and Engineering, ICMSE 2020

作者： Lu, Ying Han, Qiang Zhao, Yuan Yang, Chenggang Li, Youzhen Liu, Xiaoliang Institute of Super-Microstructure and Ultrafast Process in Advanced Materials School of Physics and Electronics Central South University Changsha410083 China

CH3NH3PbI3 (MAPbI3) films were prepared by dual-source vacuum evaporation on Au, poly(3,4-ethylenedioxythiophene) (PEDOT), and indium-tin-oxide(ITO) with the similar deposition parameters. The films were characterized with X-ray diffraction (XRD), steady-state photoluminescence (PL) and Raman spectroscopy. The interface electronic structures of co-evaporated MAPbI3 films on different substrates were studied with ultraviolet photoemission spectroscopy (UPS) and X-ray photoemission spectroscopy (XPS). The research indicates that Au is more suitable for the film growth than the other substrates, especially when the film is very thin. The poor adsorption of the precursors may make it difficult to form MAPbI3 thin film on ITO. Furthermore, it is found that the charge transfer efficiency at the interface between PEDOT and MAPbI3 is relatively high, which indicates that PEDOT can act as an effective hole transport layer for MAPbI3-based devices. © Published under licence by IOP Publishing Ltd.

关键词： Vacuum evaporation

来源：评论

学校读者我要写书评

暂无评论

Roll-to-roll gravure printing ultra-flexible sustainedphotoconductivity carbon nanotube photoelectronic synaptic transistors for bio-inspired visual perception and self-recovery simulation

引用

Nano Research 2025年第5期18卷 616-627页

作者： Xueyi Zhang Nianzi Sui Min Li Suyun Wang Shuangshuang Shao Wanrong Liu Jia Sun Junliang Yang Jianwen Zhao Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of PhysicsCentral South UniversityChangsha 410083China Key Laboratory of Semiconductor Display Materials and Chips Division of Nanodevices and Related NanomaterialsSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesNo.398 Ruoshui RoadSuzhou Industrial ParkSuzhou 215123China School of Nano Science and Technology University of Science and Technology of ChinaNo.166 Ren Ai RoadSuzhou Industrial ParkSuzhou 215123China

The development of large-area high-performance flexible photoelectronic synaptic devices has become a hot topic in the field of neuromorphic computing and artificial vision *** this work,we have successfully prepared a large-area,ultra-flexible semiconducting single-walled carbon nanotubes(sc-SWCNTs)photoelectronic synaptic thin-film transistors(TFTs)array(33×34)using solution-processable AlO_(x)thin film as the dielectrics by roll-to-roll gravure *** photoelectronic synaptic TFTs exhibit excellent electrical properties with high switching ratio(≥10^(5)),low subthreshold swing(73 mV·dec^(−1)),excellent photoresponse properties over a wide wavelength range(from 270 to 650 nm),sustained photoconductivity effect(only 26.7%drop after removing light source for 36,000 s)and remarkable mechanical reliability and flexibility(maintaining excellent electrical properties after bending more than 15,000 cycles with a bending radius of 5 mm).In addition,concepts such as multimodal optoelectronic synaptic plasticity,optical writing speed perception simulation,and human eye self-recovery model have been successfully demonstrated using printed flexible sc-SWCNTs photoelectronic neuromorphic TFTs *** importantly,we systematically investigated the response characteristics of these devices under deep ultraviolet light stimulation and,for the first time,successfully simulated bio-inspired visual perception self-recovery including the dynamic transition of the visual system from clarity to blurriness and their self-recovery over *** work indicates that our photoelectronic neuromorphic TFT devices have great practical potential in human-computer interaction,environment perception,and visual simulation.

关键词： roll-to-roll gravure printing single-walled carbon nanotubes photoelectronic synaptic transistors ultraflexibility sustained photoconductivity

来源：评论

学校读者我要写书评

暂无评论

Highly in-plane anisotropy of thermal transport in suspended ternary chalcogenide Ta_(2)NiS_(5)

引用

Nano Research 2022年第7期15卷 6601-6606页

作者： Yue Su Chuyun Deng Jinxin Liu Xiaoming Zheng Yuehua Wei Yangbo Chen Wei Yu Xiao Guo Weiwei Cai Gang Peng Han Huang Xueao Zhang College of Physical Science and Technology Xiamen UniversityXiamen 361005China College of Arts and Sciences National University of Defense TechnologyChangsha 410073China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Jiujiang Research Institute of Xiamen University Jiujiang 332105China Hunan Key Laboratory of Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China

Energy dissipation has always been an attention-getting issue in modern electronics and the emerging low-symmetry two-dimensional(2D)materials are considered to have broad prospects in solving the energy dissipation *** the thermal transport of a typical 2D ternary chalcogenide Ta_(2)NiS_(5) is *** the first time we have observed strongly anisotropic in-plane thermal conductivity towards armchair and zigzag axes of suspended few-layer Ta_(2)NiS_(5) flakes through Raman *** 7-nm-thick Ta_(2)NiS_(5) flakes,theκz i g z a g is 4.76 W·m^(−1)·K^(−1) andκa r m c h a i r is 7.79 W·m^(−1)·K^(−1),with a large anisotropic ratio(κa r m c h a i r/κz i g z a g)of 1.64 mainly ascribed to different phonon mean-free-paths along armchair and zigzag ***,the thickness dependence of thermal anisotropy is also *** the flake thickness increases,theκa r m c h a i r/κz i g z a g reduces sharply from 1.64 to *** could be attributed to the diversity in phonon boundary scattering,which decreases faster in zigzag direction than in armchair *** anisotropic property enables heat flow manipulation in Ta_(2)NiS_(5) based devices to improve thermal management and device *** work helps reveal the anisotropy physics of ternary transition metal chalcogenides,along with significant guidance to develop energy-efficient next generation nanodevices.

关键词： anisotropic thermal conductivity ternary transition metal chalcogenide Ta_(2)NiS_(5) energy dissipation phonon mode

来源：评论

学校读者我要写书评

暂无评论

Boosting acidic water oxidation performance by constructing arrays-like nanoporous Ir_(x)Ru_(1−x)O_(2) with abundant atomic steps

引用

Nano Research 2022年第7期15卷 5933-5939页

作者： Junjie Li Zan Lian Qiang Li Zhongchang Wang Lifeng Liu Francis Leonard Deepak Yanping Liu Bo Li Junyuan Xu Zuxin Chen CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Technical Institute of Physics&ChemistryChinese Academy of SciencesUrumqi 830011China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China International Iberian Nanotechnology Laboratory(INL) Braga 4715-330Portugal Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China Laboratory of Advanced Spectro-electrochemistry and Li-ion Batteries Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Institute of Semiconductors South China Normal UniversityGuangzhou 510631China

The fabrication of electrocatalysts with high activity and acid stability for acidic oxygen evolution reaction(OER)is an urgent need,yet extremely ***,we report the design and successful fabrication of a high performance self-supported cogwheel arrays-like nanoporous Ir_(x)Ru_(1−x)O_(2) catalyst with abundant atomic steps for acidic OER using a facile alloy-spinningelectrochemical activation method that allows large-scale *** obtained Ir_(x)Ru_(1−x)O_(2) catalysts merely need overpotentials of 211 and 295 mV to deliver catalytic current densities of 10 and 300 mA·cm^(−2) in 0.5 M H_(2)SO_(4),respectively,and can sustain constant OER electrolysis for at least 140 h at a high current density of 300 mA·cm^(−2).Further density functional theory(DFT)calculations uncover that such high intrinsic activities mainly originate from the largely exposed high-index atomic step planes,which markedly lower the limiting potential of the rate-determining step(RDS)of *** findings provide an insight into the exploration of high performance electrocatalysts,and open up an avenue for further developing the state-of-theart Ir and/or Ru-based catalysts for large-scale practical applications.

关键词： oxygen evolution reaction(OER)electrolysis nanoporous structure Ir_(x)Ru_(1−x)O_(2) defects atomic steps

来源：评论

学校读者我要写书评

暂无评论

Exploring the regulatory effect of stacked layers on moiréexcitons in twisted WSe_(2)/WSe_(2)/WSe_(2)homotrilayer

引用

Nano Research 2023年第7期16卷 10573-10579页

作者： Haihong Zheng Biao Wu Chang-Tian Wang Shaofei Li Jun He Zongwen Liu Jian-Tao Wang Ji-an Duan Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South University932 South Lushan RoadChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University932 South Lushan RoadChangsha 410083China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518057China

Moirésuperlattices in van der Waals structures have emerged as a powerful platform for studying the novel quantum properties of two-dimensional *** periodic moirépatterns generated by these structures lead to the formation of flat mini-bands,which alter the electronic energy bands of the *** resulting flat electronic bands can greatly enhance strong correlative interactions between electrons,leading to the emergence of exotic quantum phenomena,including moiréphonons and moiré*** extensive research has been conducted on the exotic quantum phenomena in twisted bilayers of transition metal dichalcogenides(TMDs),and the regulatory effect of stacked layers on moiréexcitons remains *** this study,we report the fabrication of a twisted WSe_(2)/WSe_(2)/WSe_(2) homotrilayer with two twist angles and investigate the influence of stacked layers on moiré*** experiments reveal multiple moiréexciton splitting peaks in the twisted trilayer,with moirépotential depths of 78 and 112 meV in the bilayer and trilayer homostructures,*** also observed the splitting of the moiréexcitons at 90 K,indicating the presence of a deeper moirépotential in the twisted ***,we demonstrate that stacked layers can tune the moiréexcitons by manipulating temperature,laser power,and magnetic *** results provide a new physical model for studying moirésuperlattices and their quantum properties,which could potentially pave the way for the development of quantum optoelectronics.

关键词： materials material field

来源：评论

学校读者我要写书评

暂无评论

Visualizing molecular unidirectional rotation by a rotated weak-field polarization technique

引用

Physical Review A 2023年第6期108卷 063108-063108页

作者： Zhenzhong Lian Zhou Chen Juan Li Chuan-Cun Shu Zhan Hu Institute of Atomic and Molecular Physics Jilin University Changchun 130012 China Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics Central South University Changsha 410083 China Advanced Light Field and Modern Medical Treatment Science and Technology Innovation Center of Jilin Province Jilin University Changchun 130012 China

The observation of molecular rotational dynamics induced by ultrashort laser pulses is of both fundamental and practical importance. Here, we develop an extended weak-field polarization method that allows us to visualize the two-dimensional spatial rotation of molecules. By manipulating the polarization direction of the pump pulse, this method allows for characterizing the rotational dependence on the azimuth angle when a weak probe pulse is present. To demonstrate this experimental scheme, we examine two types of pump pulses: (1) a linearly polarized pulse and (2) temporally delayed double pulses polarized at an angle of π/4, which are respectively applied to gas-phase molecules N2O at room temperature. The results show that this approach effectively captures the induced impulsive alignment and unidirectional rotation. By solving the time-dependent Liouville equation governing the molecules' behavior under the influence of the polarization-skewed pump pulses, we gain further insights into the mechanisms for generating unidirectional rotation. This work holds promising potential in the detection of two- and three-dimensional rotational dynamics of molecules like enantiomers and superrotors.

关键词： Atomic & molecular processes in external fields Molecules Polarization

来源：评论

学校读者我要写书评

暂无评论

Quantized charge-pumping in higher-order topological insulators

引用

Physical Review B 2022年第16期106卷 165401-165401页

作者： Bing-Lan Wu Ai-Min Guo Zhi-Qiang Zhang Hua Jiang Gusu Laboratory of Materials Suzhou 215123 China Institute for Advanced Study Soochow University Suzhou 215006 China Hunan Key Laboratory for Super-Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha 410083 China School of Physical Science and Technology Soochow University Suzhou 215006 China

We study the quantized charge pumping of higher-order topological insulators (HOTIs) with edge-corner correspondences based on the combination of the rotation of in-plane magnetic field and the quantum spin Hall effect. The picture of a specific charge pumping process is uncovered with the help of the nonequilibrium Green's function method. Significantly, we demonstrate that the quantized charge pumping current is achieved without the participation of bulk states, and the charges move along the boundary of the sample. Furthermore, the effects of external parameters on the pumping current is also studied. We find that the magnitude and direction of the pumping current can be manipulated by adjusting the coupling strength between the leads and sample. Our paper deepens the understanding of the charge pumping in HOTIs and extends the study of their transport properties.

关键词： Geometric & topological phases Quantum transport Topological insulators Transport phenomena

来源：评论

学校读者我要写书评

暂无评论

Enhanced Dielectric Loss in N-Doped 3d Porous Carbon for Microwave Absorption

SSRN

引用

SSRN 2023年

作者： Ma, Lei Wu, Yueyang Wu, Zhiwei Xia, Pengkun He, Yuxin Zhang, Lin Fan, Hui Tong, Chuanjia Zhang, Long Gao, Xiaohui Deng, Lianwen Hunan Provincial Key Laboratory for Super-Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha410083 China Hunan Provincial Key Laboratory for Advanced Materials For New Energy Storage nad Conversion School of Materials Science and Engineering Hunan University of Science and Technology Xiangtan411201 China

In this work, a three-dimensional porous carbon structure was in situ constructed by connecting carbon polyhedrons with graphitic nanosheets. The rich pores, high nitrogen doping content and abundant defects formed on the surface provided multiple antennas for electromagnetic wave absorption. The optimized reflection loss of the material was as low as -41.65 dB with the effective absorption band of 5.84 GHz, covering the whole Ku band. Mechanistic investigation from density functional theory calculations and electrochemical analysis showed that dipole loss and conduction loss were mainly caused by pyrrolic nitrogen and the higher electron mobility in the prepared materials. At the same time, there is a balance between conduction loss and polarization loss, which cooperatively adjusts the absorbing properties of materials. Furthermore, the material’s potential practical application performance evaluated by computer simulation technology (CST) presented that the simulated RCS values were all lower than 20 dBm2. Thus, this work enlightens new insights and methods for understanding of the microwave absorption properties of the carbon-materials. © 2023, The Authors. All rights reserved.

关键词： Dielectric losses

来源：评论

学校读者我要写书评

暂无评论

ultrafast growth of high-quality large-sized GaSe crystals by liquid metal promoter

引用

Nano Research 2022年第5期15卷 4677-4681页

作者： Zuxin Chen Quan Chen Zebing Chai Bin Wei Jun Wang Yanping Liu Yumeng Shi Zhongchang Wang Jingbo Li Institute of semiconductors South China Normal UniversityGuangzhou 510631China School of Materials Sun Yat-Sen UniversityGuangzhou 510275China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430000China School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South University932 South Lushan RoadChangsha 410083China Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China International Iberian Nanotechnology Laboratory(INL) 4715–330 BragaPortugal

Growth of high-quality large-sized crystals using the traditional chemical vapor transport(CVT)or vertical Bridgman(VB)technique is costly and time-consuming,limiting its practical industrial ***,we propose an ultrafast crystal growth process with low energy consumption and capability of producing crystals of excellent quality,and demonstrate that large-sized GaSe crystals with a lateral size of 0.5 to 1 cm can be obtained within a short period of 5 min.X-ray diffraction(XRD)and scanning transmission electron microscopy(STEM)studies clearly indicate that the as-grown crystals have a good *** further show the potential application of the resulting GaSe crystals,we fabricate the few-layer GaSe-based photodetector,which exhibits low dark current of 21 pA and fast response of 34 ms under 405 nm *** proposed technique for rapid crystal growth could be further extended to other metallenes with low-melting point,such as Bi-,Sn-,In-,Pb-based crystals,opening up a new avenue in fulfilling diverse potential optoelectronics applications of two-dimensional(2D)crystals.

关键词： GaSe ultrafast growth photodetector liquid metal

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：