检索结果-南通市图书馆

Light(Science & Applications) 2020年第1期9卷 603-610页

作者： Jiajun Wang Han Li Yating Ma Maoxiong Zhao Wenzhe Liu Bo Wang Shiwei Wu Xiaohan Liu Lei Shi Tian Jiang Jian Zi State key laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonics Structures(Ministry of Education)and Department of PhysicsFudan University200433 ShanghaiChina College of Advanced Interdisciplinary Studies National University of Defense Technology410073 ChangshaChina Collaborative Innovation Center of Advanced Microstructures Nanjing University210093 NanjingChina

The valleys of two-dimensional transition metal dichalcogenides(TMDCs)offer a new degree of freedom for information *** take advantage of this valley degree of freedom,on the one hand,it is feasible to control valleys by utilizing different external stimuli,such as optical and electric *** the other hand,nanostructures are also used to separate the valleys by near-field ***,for both of the above methods,either the required low-temperature environment or low degree of coherence properties limit their further ***,we demonstrate that all-dielectric photonic crystal(PhC)slabs without in-plane inversion symmetry(C_(2) symmetry)can separate and route valley exciton emission of a WS2 monolayer at room *** with circularly polarized photonic Bloch modes of such PhC slabs,valley photons emitted by a WS_(2) monolayer are routed directionally and are efficiently separated in the far *** addition,far-field emissions are directionally enhanced and have long-distance spatial coherence properties.

关键词： valley symmetry Bloch

Optical nonreciprocity in a piezo-optomechanical system

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第7期29卷 321-325页

作者：肖玉铭刘军浩吴琴於亚飞张智明 Guangdong Provincial key laboratory of Nanophotonic Functional Materials and Devices and School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006China Guangdong Provincial key laboratory of quantum Engineering and quantum Materials South China Normal UniversityGuangzhou 510006China School of Biomedical Engineering Guangdong Medical UniversityDongguan 523808China

We theoretically study the optical nonreciprocity in a piezo-optomechanical microdisk resonator,in which the cavity modes and the mechanical mode are optically pumped and piezoelectrically driven,*** asymmetric optical pumping and different piezoelectrical drivings,our system shows some nonreciprocal optical *** find that our system can function as an optical isolator,a nonreciprocal amplifier,or a nonreciprocal phase shifter.

关键词： quantum optics cavity optomechanical system optical nonreciprocity piezoelectric force

Ferromagnetic and ferroelectric two-dimensional materials for memory application

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第6期14卷 1802-1813页

作者： Zhen Liu Longjiang Deng Bo Peng National Engineering Research Center of Electromagnetic Radiation control Materials School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu611731China key laboratory of Multi-spectral Absorbing Materials and structures of ministry of education University of Electronic Science and Technology of ChinaChengdu611731China State key laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu611731China

The discoveries of ferromagnetic and ferroelectric two-dimensional(2D)materials have dramatically inspired intense interests due to their potential in the field of spintronic and nonvolatile *** review focuses on the latest 2D ferromagnetic and ferroelectric materials that have been most recently studied,including insulating ferromagnetic,metallic ferromagnetic,antiferromagnetic and ferroelectric 2D *** fundamental properties that lead to the long-range magnetic orders of 2D materials are *** low Curie temperature(Tc)and instability in 2D systems limits their use in practical applications,and several strategies to address this constraint are proposed,such as gating and composition stoichiometry.A van der Waals(vdW)heterostructure comprising 2D ferromagnetic and ferroelectric materials will open a door to exploring exotic physical phenomena and achieve multifunctional or nonvolatile devices.

关键词： two-dimensional(2D)materials ferromagnetic ferroelectric heterostructure nonvolatile memory

Superconducting fluctuation induced conductance corrections near a pair-breaking quantum phase transition in doubly connected ultrathin cylinders of Al

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2020年第3期63卷 89-97页

作者： Ke Zhang ZongLi Wang Da Xu YaZhe Wang H.Wang Ying Liu Department of Physics Zhejiang UniversityHangzhou 310027China key laboratory of Artificial structures and quantum control(MOE)and Shanghai Center for Complex Physics School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Materials Research Institute and Department of Physics Pennsylvania State UniversityUniversity ParkPA 16802USA Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

We report measurements on ultrathin,doubly connected superconducting cylinders of Al that exhibit a destructive regime,which refers to the loss of superconductivity in a doubly connected superconductor near applied half flux quanta due to the sample topology and the small size of the sample.A depairing quantum phase transition(QPT)between a superconducting and metallic state tuned by the magnetic flux enclosed in the quasi one-dimensional(1D)cylinder was found at the onset of the destructive *** on magnetic flux and temperature dependent sample resistance as well as current-voltage characteristics revealed the presence of both thermally activated and quantum phase slips near the depairing *** the superconducting side of the QPT,thermally activated phase slips as described by the Langer-Ambegaokar and McCumber-Halperin(LAMH)theory were found to describe the sample resistance as the system was pushed towards the QPT by a magnetic field applied along the cylinder ***,deviation from this behavior was found at low temperatures,signaling the presence of the quantum phase *** importantly,we observed a highly unusual negative slope in the resistance versus temperature curves on the metallic side of the QPT as predicted by the diagrammatic calculation of the dc conductivities in a 1D system near a depairing *** work suggests that fluctuations from both the phase and the amplitude of the superconducting order parameter are important for the superconductor-to-metal depairing QPT.

关键词： mesoscopic superconductor quantum phase transition superconducting fluctuation

Calculation of valence band structures of InAs/GaAs quantum ring and quantum dot:using numerical Fourier transform method

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2010年第1期17卷 106-110页

作者： JIA Bo-yong,YU Zhong-yuan,LIU Yu-min,TIAN Hong-da key laboratory of Information Photonics and Optical Communications,ministry of education,Beijing University of Posts and Telecommunications,Beijing 100876,China key laboratory of Information Photonics and Optical Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

This article puts forward a new method in calculating the band structures of low-dimensional semiconductor structures. In this study, the valence band structures of InAs/GaAs quantum ring and lens-shaped quantum dot are calculated with four-band model, in the framework of effective-mass envelope function theory. To determine the Hamiltonian matrix elements, this article develops the numerical Fourier transform method instead of the widely used analytical integral method. The valence band mixing is considered. The hole energy levels change dramatically with the geometrical parameters of the quantum ring and quantum dot. It is demonstrated that numerical Fourier transform method can be adopted in low-dimensional structures with any shape. The results of Fourier transform method are consistent with the ones of analytical integral in literature; and they are helpful for studying and fabricating optoelectronic devices.

关键词： valence band structures quantum ring quantum dot numerical Fourier transform

Epitaxial growth of trilayer graphene moiré superlattice

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2023年第7期32卷 510-514页

作者：袁亚龙褚衍邦胡成田金朋刘乐吴帆帆季怡汝赵交交黄智恒昝晓洲杜罗军 Kenji Watanabe Takashi Taniguchi 时东霞史志文杨威张广宇 Beijing National laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences(CAS)Beijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China key laboratory of Artificial structures and quantum control(ministry of education) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China Research Center for Functional Materials National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan Songshan Lake Materials laboratory Dongguan 523808China

The graphene-based moiré superlattice has been demonstrated as an exciting system for investigating strong correlation phenomenon. However, the fabrication of such moiré superlattice mainly relies on transfer technology. Here, we report the epitaxial growth of trilayer graphene(TLG) moiré superlattice on hexagonal boron nitride(h BN) by a remote plasma-enhanced chemical vapor deposition method. The as-grown TLG/h BN shows a uniform moiré pattern with a period of ~ 15 nm by atomic force microscopy(AFM) imaging, which agrees with the lattice mismatch between graphene and h BN. By fabricating the device with both top and bottom gates, we observed a gate-tunable bandgap at charge neutral point(CNP) and displacement field tunable satellite resistance peaks at half and full fillings. The resistance peak at half-filling indicates a strong electron–electron correlation in our grown TLG/h BN superlattice. In addition, we observed quantum Hall states at Landau level filling factors ν = 6, 10, 14,..., indicating that our grown trilayer graphene has the ABC stacking order. Our work suggests that epitaxy provides an easy way to fabricate stable and reproducible two-dimensional strongly correlated electronic materials.

关键词： epitaxial growth ABC-TLG/hBN moirésuperlattice electron correlations

Stress regulation of photosynthetic system of Phaeocystis globosa and their hemolytic activity

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2022年第6期40卷 2164-2177页

作者： Ni WU Suping FU Xinru SONG Mengmeng TONG Tianjiu JIANG key laboratory of Aquatic Eutrophication and control of Harmful Algal Blooms of Guangdong Higher education Institute Research Center of HydrobiologyJinan UniversityGuangzhou 510632China South China Sea Institute of Planning and Environmental Research State Oceanic AdministrationGuangzhou 510300China Ocean College Zhejiang UniversityZhoushan 316021China

Blooms of Phaeocystis globosa have been reported accountable for massive fi sh mortality *** toxigenic mechanisms of ***,however,remain largely unclear due to the multiple structures and/or synergistic or antagonistic ef fects of hemolytic *** stressors could lead to the regulation of photoprotective or antioxidative defense system,as well as the potential hemolytic ***,the light-induced photosynthetic system,including the accessory photosynthetic growth,the relative electron transfer rate(ETR),photosynthetic e ffi ciency(F_(v)/F_(m)),quantum yield of photosystem II(Yield),together with the hemolytic activity of *** were investigated under variable environmental conditions in the present *** confirmed that hemolytic activity of *** was initiated by the light,but inhibited by low temperature(16℃),high light intensity(>100μmol/(m^(2)·s)),and iron-limited ***,the hemolytic activity was not impacted by photosynthetic electron inhibitors(Diuron,atrazine,paraquat,and dibromothymoquinone),which signifi cantly inhibited the photosynthetic activity of *** correlated response of hemolytic and photosynthetic activity of *** under those environmental factors suggested that the hemolytic compounds of *** would be involved in the photosynthetic process but not in the electron transfer chain of ***.

关键词： Phaeocystis globosa hemolytic activity photosynthetic system

Topological phases in pyrochlore thallium niobate Tl_(2)Nb_(2)O_(6+x)

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2019年第1期5卷 225-231页

作者： Wei Zhang Kaifa Luo Zhendong Chen Ziming Zhu Rui Yu Chen Fang Hongming Weng Fujian Provincial key laboratory of quantum Manipulation and New Energy Materials College of Physics and EnergyFujian Normal UniversityFuzhou 350117China Fujian Provincial Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices Xiamen 361005China School of Physics and Technology Wuhan UniversityWuhan 430072China key laboratory of low-dimensional quantum structures and quantum control of ministry of education Department of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China Beijing National laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials laboratory Dongguan 523808 GuangdongChina CAS Centre for Excellence in Topological quantum Computation Beijing 100190China

The discovery of new topological electronic materials brings a chance to uncover new *** to now,many materials have been theoretically proposed and experimentally proved to host different kinds of topological ***,there is little convincing experimental evidence for the existence of topological *** reason is that oxidation of oxygen leads to ionic crystal in general and makes band inversion *** addition,the realization of different topological states in a single material is quite difficult,but strongly needed for exploring topological phase transitions.

关键词： topological realization transitions

Non-volatile optical memory in vertical van der Waals heterostructures

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Semiconductors 2020年第7期41卷 49-53页

作者： Siyu Zhou Bo Peng National Engineering Research Center of Electromagnetic Radiation control Materials School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China State key laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China key laboratory of Multi-Spectral Absorbing Materials and structures of ministry of education University of Electronic Science and Technology of ChinaChengdu 610054China

Emulating synaptic plasticity in an artificial neural network is crucial to mimic the basic functions of the human *** this work,we report a new optoelectronic resistive random access memory(ORRAM)in a three-layer vertical heterostructure of graphene/Cd Se quantum dots(QDs)/graphene,which shows non-volatile multi-level optical memory under optical stimuli,giving rise to light-tunable synaptic *** optical non-volatile storage time is up to^450 *** device realizes the function of multi-level optical storage through the interlayer changes between graphene and *** work highlights the feasibility for applying two-dimensional(2D)materials in ORRAM and optoelectronic synaptic devices towards artificial vision.

关键词： ORRAM heterostructure synaptic devices

可控氧化方法制备的锰氧化物中隐藏的金属-绝缘体转变研究（英文）

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2019年第4期62卷 577-585页

作者：宋创业 Iftikhar Ahmed Malik 李梦蕾张庆华王立辰王静陈荣艳郑仁奎董帅谷林段文晖南策文张金星 Department of physics Beijing Normal University Department of Physics Capital Normal University Institute of physics Chinese Academy of Sciences School of Materials Science and Engineering Tsinghua University Center for Advanced quantum Studies Beijing Normal University State key laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences School of Physics Southeast University Department of Physics and State key laboratory of low-dimensional quantum Physics Tsinghua University

氧在调节复杂氧化物中的相结构和功能方面扮演着重要的角色,比如高温超导体、庞磁电阻、催化等,人们急需在这些功能氧化物中实现有效且可控的氧含量调控.在此工作中我们通过改变气体氛围温度来精确的调控氧化活性,从而实现一种新的化学... 详细信息

氧在调节复杂氧化物中的相结构和功能方面扮演着重要的角色,比如高温超导体、庞磁电阻、催化等,人们急需在这些功能氧化物中实现有效且可控的氧含量调控.在此工作中我们通过改变气体氛围温度来精确的调控氧化活性,从而实现一种新的化学辅助的高质量外延薄膜的制备方法.以钙钛矿锰氧化物La_(0.5)Sr_(0.5)MnO_3(LSMO)为例,通过调控薄膜样品中氧的化学计量比,我们首次发现了该体系中隐藏的由相竞争产生的金属-绝缘体转变.氧组分引起的Mn离子间的交换相互作用以及载流子浓度的变化可能是此相转变产生的原因,这与第一性原理计算十分符合.不同于传统的阳离子掺杂,有效的阴离子(O^(2-), S^(2-)等)调节提供了一种新的实现复杂氧化物外延薄膜中调控相结构和功能的技术手段.

关键词： oxidative-activity oxygen-content manganites hidden metal-insulator transition