检索结果-南通市图书馆

Regulating off-centering distortion maximizes photoluminescence in halide perovskites

在线全文

学校读者我要写书评

暂无评论

National Science Review 2021年第9期8卷 60-67页

作者： Xujie Lu Constantinos Stoumpos Qingyang Hu Xuedan Ma Dongzhou Zhang Songhao Guo Justin Hoffman Kejun Bu Xiaofeng Guo Yingqi Wang Cheng Ji Haijie Chen Hongwu Xu Quanxi Jia Wenge Yang Mercouri G.Kanatzidis Ho-Kwang Mao Center for High Pressure Science and Technology Advanced Research Department of Chemistry Northwestern University Department of Materials Science and Technology Voutes Campus University of Crete Center for Nanoscale Materials Argonne National Laboratory partnership for extreme crystallography University of Hawaii at Manoa Department of Chemistry and Alexandra Navrotsky Institute for Experimental Thermodynamics Washington State University Earth and Environmental Sciences Division Los Alamos National LaboratoryLos Alamos Department of Materials Design and Innovation University at Buffalo The State University of New York

Metal halide perovskites possess unique atomic and electronic configurations that endow them with high defect tolerance and enable high-performance photovoltaics and optoelectronics. Perovskite light-emitting diodes have achieved an external quantum efficiency of over 20%. Despite tremendous progress,fundamental questions remain, such as how structural distortion affects the optical properties. Addressing their relationships is considerably challenging due to the scarcity of effective diagnostic tools during structural and property tuning as well as the limited tunability achievable by conventional methods. Here,using pressure and chemical methods to regulate the metal off-centering distortion, we demonstrate the giant tunability of photoluminescence (PL) in both the intensity (>20 times) and wavelength(>180 nm/GPa) in the highly distorted halide perovskites [CH3NH3GeI3, HC(NH2)2GeI3, and Cs Ge I3].Using advanced in situ high-pressure probes and first-principles calculations, we quantitatively reveal a universal relationship whereby regulating the level of off-centering distortion towards 0.2 leads to the best PL performance in the halide perovskites. By applying this principle, intense PL can still be induced by substituting CH3NH~3+with Cs~+to control the distortion in (CH3NH3)1-xCsxGeI3, where the chemical substitution plays a similar role as external pressure. The compression of a fully substituted sample of CsGe I3further tunes the distortion to the optimal value at 0.7 GPa, which maximizes the emission with a10-fold enhancement. This work not only demonstrates a quantitative relationship between structural distortion and PL property of the halide perovskites but also illustrates the use of knowledge gained from high-pressure research to achieve the desired properties by ambient methods.

关键词： halide perovskites high pressure off-centering distortion optical properties lone-pair electrons quantitative relationship

Spatiotemporal evolution of continuous-wave field and dark soliton formation in a microcavity with normal dispersion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第7期26卷 167-172页

作者：胡晓鸿张伟刘元山冯野张文富王擂然王屹山赵卫 State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of Sciences University of Chinese Academy of Sciences Collaborative Innovation Center of extreme Optics Shanxi University

Stable dark soliton and dark pulse formation in normally dispersive and red-detuned microcavities are investigated by numerically solving the normalized Lugiato-Lefever equation. The soliton essence is proved by fitting the calculated field intensity profile with the analytical formula of a dark soliton. Meanwhile, we find that a dark soliton can be generated either from the nonlinear evolution of an optical shock wave or narrowing of a locally broad dark pulse with smoother fronts. Explicit analytical expression is obtained to describe the oscillatory fronts of the optical shock wave. Furthermore,from the calculation results, we show that for smaller frequency detunings, e.g., α 3, in addition to the dark soliton formation, a single dark pulse with an oscillatory dip can also arise and propagate stably in the microcavity under proper pump detuning and pump strength combination. The existence region together with various field intensity profiles and the corresponding spectra of single dark pulse are demonstrated.

关键词： pulse propagation temporal solitons microcavities nonlinear optics

Non-Monotonic Evolution of Carrier Density and Mobility under Thermal Cycling Treatments in Dirac Semimetal Cd_(3)As_(2) Microbelts

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2021年第4期38卷 91-95页

作者： Zheng Chen Min Wu Yequn Liu Wenshuai Gao Yuyan Han Jianhui Zhou Wei Ning Mingliang Tian Anhui Province Key Laboratory of Condensed Matter Physics at extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China Department of Physics University of Science and Technology of ChinaHefei 230026China Analytical Instrumentation Center State Key Laboratory of Coal ConversionInstitute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China Department of Physics School of Physics and Materials ScienceAnhui UniversityHefei 230601China

Tunable carrier density plays a key role in the investigation of novel transport properties in three-dimensional topological *** demonstrate that the carrier density,as well as the mobility,of Dirac semimetal Cd_(3)As_(2) nanoplates can be effectively tuned via in situ thermal treatment at 350 K for one hour,resulting in non-monotonic evolution by virtue of the thermal cycling *** upward shift of Fermi level relative to the Dirac nodes blurs the surface Fermi-arc states,accompanied by an anomalous phase shift in the oscillations of bulk states,due to a change in the topology of the ***,the oscillation peaks of bulk longitudinal magnetoresistivity shift at high fields,due to their coupling to the oscillations of the surface Fermi-arc *** work provides a thermal control mechanism for the manipulation of quantum states in Dirac semimetal Cd_(3)As_(2) at high temperatures,via their carrier density.

关键词： density. Dirac Fermi

Ultrafast vortex microlasers based on bounded states in the continuum

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2020年第18期65卷 1519-1520,M0003页

作者： Feihong Lin Salman Ullah Qing Yang State Key Laboratory of Modern Optical Instrumentation Joint International Research Laboratory of PhotonicsZhejiang UniversityHangzhou 310027China College of Optical Science and Engineering Zhejiang UniversityHangzhou 310027China Research Center for Smart Sensing Zhejiang LaboratoryHangzhou 310000China Collaborative Innovation Center of extreme Optics Shanxi UniversityTaiyuan 030006China

Driven by the demand for on-chip integrated sources of structured light in classical and quantum information,significant research efforts have been made to study the ultrafast control of microlasers,especially of on-c... 详细信息

关键词： vortex quantum continuum

Breakdown of effective-medium theory by a photonic spin Hall effect

在线全文

学校读者我要写书评

暂无评论

中国科学:物理学、力学、天文学英文版 2023年第11期66卷 145-154页

作者： Shuaijie Yuan Xinxing Zhou Yu Chen Yuhan Zhong Lijuan Sheng Hao Hu Hongsheng Chen Ido Kaminer Xiao Lin Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Synergetic Innovation Center for Quantum Effects and ApplicationsSchool of Physics and ElectronicsHunan Normal UniversityChangsha410081China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong ProvinceInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen518060China Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and InstrumentationZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou310027China International Joint Innovation Center Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining314400China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore Key Laboratory of Radar Imaging and Microwave Photonics Ministry of EducationCollege of Electronic and Information EngineeringNanjing University of Aeronautics and AstronauticsNanjing211106China Key Laboratory of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang Jinhua Institute of Zhejiang UniversityZhejiang UniversityJinhua321099China Shaoxing Institute of Zhejiang University Zhejiang UniversityShaoxing312000China Department of Electrical Engineering Technion-Israel Institute of TechnologyHaifa32000Israel

Effective-medium theory pertains to the theoretical modelling of homogenization,which aims to replace an inhomogeneous structure of subwavelength-scale constituents with a homogeneous effective *** effective-medium theory is fundamental to various realms,including electromagnetics and material science,since it can largely decrease the complexity in the exploration of light-matter interactions by providing simple acceptable ***,the effective-medium theory is thought to be applicable to any all-dielectric system with deep-subwavelength constituents,under the condition that the effective medium does not have a critical angle,at which the total internal reflection *** we reveal a fundamental breakdown of the effective-medium theory that can be applied in very general conditions:showing it for deep-subwavelength all-dielectric multilayers even without a critical *** finding relies on an exotic photonic spin Hall effect,which is shown to be ultrasensitive to the stacking order of deep-subwavelength dielectric layers,since the spin-orbit interaction of light is dependent on slight phase accumulations during the wave *** results indicate that the photonic spin Hall effect could provide a promising and powerful tool for measuring structural defects for all-dielectric systems even in the extreme nanometer scale.

关键词： photonic spin Hall effect effective-medium theory spin-orbit interaction of light

Future for inertial-fusion energy in Europe:a roadmap

在线全文

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2023年第6期11卷 162-192页

作者： Dimitri Batani Arnaud Colaitis Fabrizio Consoli Colin N.Danson Leonida Antonio Gizzi Javier Honrubia Thomas Kühl Sebastien Le Pape Jean-Luc Miquel Jose Manuel Perlado R.H.H.Scott Michael Tatarakis Vladimir Tikhonchuk Luca Volpe Centre Lasers Intenses et Applications(CELIA) Universitéde Bordeaux±CNRS±CEATalence cedexFrance ENEA Fusion and Technology for Nuclear Safety and Security DepartmentC.R.FrascatiFrascatiItaly AWE AldermastonReadingUK Centre for Inertial Fusion Studies Blackett LaboratoryImperial College LondonLondonUK Istituto Nazionale di Ottica Consiglio Nazionale delle Ricerche(CNR-INO)PisaItaly ETSIAE Universidad Politecnica de Madrid MadridSpain GSI-Helmholtzzentrum für Schwerionenforschung GmbH DarmstadtGermany Laboratoire pour l’Utilisation des Lasers Intenses(LULI) CNRS±Ecole PolytechniquePalaiseau cedexFrance ALP Le BarpFrance and CEA/DAMÎle de FranceBruyères le ChâtelArpajon cedexFrance Instituto Fusión NuclearªGuillermo Velardeº(IFN-GV) Universidad Politecnica de MadridMadridSpain Central Laser Facility STFC Rutherford Appleton LaboratoryHarwell OxfordOxfordshireUK Institute of Plasma Physics and Lasers University Research and Innovation CentreHellenic Mediterranean UniversityRethymnoCreteGreece Department of Electronic Engineering School of EngineeringHellenic Mediterranean UniversityChaniaCreteGreece extreme Light Infrastructure ERIC ELI-Beamlines FacilityDolníBÏrežanyCzech Republic Centro de Laseres Pulsados(CLPU) Parque CientificoVillamayorSalamancaSpain

The recent achievement of fusion ignition with laser-driven technologies at the National Ignition Facility sets a historic accomplishment in fusion energy *** accomplishment paves the way for using laser inertial fusion as a viable approach for future energy *** has a unique opportunity to empower research in this field internationally,and the scientific community is eager to engage in this *** propose establishing a European programme on inertial-fusion energy with the mission to demonstrate laser-driven ignition in the direct-drive scheme and to develop pathway technologies for the commercial fusion *** proposed roadmap is based on four complementary axes:(ⅰ)the physics of laser-plasma interaction and burning plasmas;(ⅱ)high-energy high repetition rate laser technology;(ⅲ)fusion reactor technology and materials;and(ⅳ)reinforcement of the laser fusion community by international education and training *** foresee collaboration with universities,research centres and industry and establishing joint activities with the private sector involved in laser *** project aims to stimulate a broad range of high-profile industrial developments in laser,plasma and radiation technologies along with the expected high-level socio-economic impact.

关键词： education and training fusion reactor technology high-energy laser high repetition rate laser inertial confinement fusion laser-plasma interaction public-private partnership radiation resistant materials