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Layer-Valley Hall Effect under Inversion and Time-Reversal Symmetries

Chinese Physics Letters 2024年第6期41卷 88-97页

作者：赵交交刘贵斌陈鹏姚裕贵张广宇杜罗军 Beijing National Laboratory for Condensed Matter Physics and Key Laboratory for Nanoscale Physics and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijing 100081China Schoolof Microelectronics Southern University of Science and TechnologyShenzhen 518055China Songshan Lake Materials Laboratory Dongguan 523808China

Hall effects have been the central paradigms in modern physics,materials science and practical applications,and have led to many exciting breakthroughs,including the discovery of topological Chern invariants and the revolution of metrological resistance *** date,the Hall effects have mainly focused on a single degree of freedom(Do F),and most of them require the breaking of spatial-inversion and/or time-reversal *** we demonstrate a new type of Hall effect,i.e.,layer-valley Hall effect,based on a combined layer-valley Do F characterized by the product of layer and valley *** layer-valley Hall effect has a quantum origin arising from the layer-valley contrasting Berry curvature,and can occur in nonmagnetic centrosymmetric crystals with both spatial-inversion and time-reversal symmetries,transcending the symmetry constraints of single Do F Hall effect based on the constituent layer or valley ***,the layer-valley Hall effect is highly tunable and shows a W-shaped pattern in response to the out-of-plane electric ***,we discuss the potential detection approaches and material-specific design principles of layer-valley Hall *** results demonstrate novel Hall physics and open up exotic paradigms for new research direction of layer-valleytronics that exploits the quantum nature of the coupled layer-valley DoF.

关键词： quantum Inversion curvature

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A facile and efficient dry transfer technique for two-dimensional Van der Waals heterostructure

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Chinese Physics B 2017年第8期26卷 417-422页

作者：谢立杜罗军卢晓波杨蓉时东霞张广宇 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences(CAS)Beijing 100190China School of Physical Science University of Chinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Quantum Matter Beijing 100190China Beijing Key Laboratory for Nanomaterials and Nanodevices Beijing 100190China

Two-dimensional （2D） Van der Waals heterostructures have aroused extensive concerns in recent years. Their fabrica- tion calls for facile and efficient transfer techniques for achieving well-defined structures. In this work, we report a simple and effective dry transfer method to fabricate 2D heterostructures with a clean interface. Using Propylene Carbonate （PC） films as stamps, we are able to pick up various 2D materials flakes from the substrates and unload them to the receiving substrates at an elevated temperature. Various multilayer heterostructures with ultra-clean interfaces were fabricated by this technique. Furthermore, the 2D materials can be pre-pattemed before transfer so as to fabricate desired device structures, demonstrating a facile way to promote the development of 2D heterostructures.

关键词： two-dimensional materials Van der Waals heterostructure Propylene Carbonate transfer

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转型期天津内城更新的路径特征及社会影响研究

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自然资源学报 2025年第01期 231-248页

作者：李晋轩杜孟鸽孙宗耀曾鹏周梦抒天津大学建筑学院自然资源部陆海统筹关键带国土空间规划与治理工程技术创新中心昆明理工大学建筑与城市规划学院

基于高清卫星影像与多源动态数据，绘制高时空分辨率地块图斑一手数据库，量化解析2001—2020年间天津内城更新的行动路径及其社会影响逻辑。研究发现：转型期内城更新行动规模大、强度高、时空异质性显著，多发生于历史文化富集、空间... 详细信息

基于高清卫星影像与多源动态数据，绘制高时空分辨率地块图斑一手数据库，量化解析2001—2020年间天津内城更新的行动路径及其社会影响逻辑。研究发现：转型期内城更新行动规模大、强度高、时空异质性显著，多发生于历史文化富集、空间肌理完整、区位优势突出的传统旧城和旧工业仓储区，并经由大规模拆除重建迅速引发用地功能格局的系统转型；同时，转型期内城更新分别在经济财富分配、社群空间迁移、日常生活转变三个维度引发复杂的次生社会影响，当前仍待持续开展精准施策、标本兼治的治理调控。研究补充了完整内城尺度下有关“存量更新社会绩效”的实证经验，有助于中国城市在新时期的精细化规划编制与更新治理。

关键词：城市更新路径特征社会影响转型期天津

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Coupled Ferroelectricity and Correlated States in a Twisted Quadrilayer MoS_(2) Moiré Superlattice

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Chinese Physics Letters 2023年第4期40卷 68-73页

作者：吴帆帆李璐徐巧玲刘乐袁亚龙赵交交黄智恒昝晓洲 Kenji Watanabe Takashi Taniguchi 时东霞冼乐德杨威杜罗军张广宇 Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China College of Physics and Electronic Engineering Center for Computational SciencesSichuan Normal UniversityChengdu 610068China 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

Moiré superlattices have emerged as a highly controllable quantum platform for exploration of various fascinating phenomena,such as Mott insulator states,ferroelectric order,unconventional superconductivity and orbital *** remarkable progress has been achieved,current research in moiré physics has mainly focused on the single species properties,while the coupling between distinct moiré quantum phenomena remains *** we demonstrate,for the first time,the strong coupling between ferroelectricity and correlated states in a twisted quadrilayer MoS2moiré superlattice,where the twist angles are controlled in sequence to be ~57°,~0°,and ~-57°.Correlated insulator states are unambiguously established at moiré band filling factors v = 1,2,3 of twisted quadrilayer MoS_(2).Remarkably,ferroelectric order can occur at correlated insulator states and disappears quickly as the moiré band filling deviates from the integer fillings,providing smoking gun evidences of the coupling between ferroelectricity and correlated *** results demonstrate the coupling between different moiré quantum properties and will hold great promise for new moiré physics and applications.

关键词： ferroelectric quantum twisted

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Pressure-mediated contact quality improvement between monolayer MoS_2 and graphite

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Chinese Physics B 2019年第1期28卷 178-182页

作者： Mengzhou Liao Luojun Du Tingting Zhang Lin Gu Yugui Yao Rong Yang Dongxia Shi Guangyu Zhang CAS Key Laboratory of Nanoscale Physics and Devices Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Department of Electronics and Nanoengineering Aalto University Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelecentronic Systems School of PhysicsBeijing Institute of Technology Beijing Key Laboratory for Nanomaterials and Nanodevices Collaborative Innovation Center of Quantum Matter

Two-dimensional(2D) materials and their heterostructures have attracted a lot of attention due to their unique electronic and optical properties. MoS_2 as the most typical 2D semiconductors has great application potential in thin film transistors, photodetector, hydrogen evolution reaction, memory device, etc. However, the performance of MoS_2 devices is limited by the contact resistance and the improvement of its contact quality is important. In this work, we report the experimental investigation of pressure-enhanced contact quality between monolayer MoS_2 and graphite by conductive atom force microscope(C-AFM). It was found that at high pressure, the contact quality between graphite and MoS_2 is significantly improved. This pressure-mediated contact quality improvement between MoS_2 and graphite comes from the enhanced charge transfer between MoS_2 and graphite when MoS_2 is stretched. Our results provide a new way to enhance the contact quality between MoS_2 and graphite for further applications.

关键词： MoS2/graphite heterojunction C-AFM pressure contact quality

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Epitaxial growth of trilayer graphene moiré superlattice

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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

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Precisely controlling the twist angle of epitaxial MoS_(2)/graphene heterostructure by AFM tip manipulation

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Chinese Physics B 2022年第8期31卷 173-177页

作者： Jiahao Yuan Mengzhou Liao Zhiheng Huang Jinpeng Tian Yanbang Chu Luojun Du Wei Yang Dongxia Shi Rong Yang Guangyu Zhang Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China College of Semiconductors(College of Integrated Circuits Hunan UniversityChangsha 410082China Songshan Lake Materials Laboratory Dongguan 523808China Department of Control Engineering Faculty of Electrical EngineeringCzech Technical University in PragueCzech Republic

Two-dimensional(2D)moirématerials have attracted a lot of attention and opened a new research frontier of twistronics due to their novel physical *** great progress has been achieved,the inability to precisely and reproducibly manipulate the twist angle hinders the further development of ***,we demonstrated an atomic force microscope(AFM)tip manipulation method to control the interlayer twist angle of epitaxial MoS_(2)/graphene heterostructure with an ultra-high accuracy better than 0.1°.Furthermore,conductive AFM and spectroscopic characterizations were conducted to show the effects of the twist angle on moirépattern wavelength,phonons and *** work provides a technique to precisely control the twist angle of 2D moirématerials,enabling the possibility to establish the phase diagrams of moiréphysics with twist angle.

关键词： AFM tip manipulation MoS_(2)/graphene heterostructure twist angle moirésuperlattice

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大喂入量履带式联合收获机载荷测试系统构建与分析

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农机化研究 2025年第4期 65-69+76页

作者：李顾鹏李耀明夏圣博杜拓吴颖江苏大学农业工程学院

为了给大喂入量联合收获机传动系统的设计和动力分配提供科学合理的依据，需要得到主要工作部件在不同工况下的工作载荷。为此，以沃得公司的巨龙360型履带式联合收获机为样机(发动机额定功率128.5 kW、喂入量≥10 kg/s),并根据样机的... 详细信息

为了给大喂入量联合收获机传动系统的设计和动力分配提供科学合理的依据，需要得到主要工作部件在不同工况下的工作载荷。为此，以沃得公司的巨龙360型履带式联合收获机为样机(发动机额定功率128.5 kW、喂入量≥10 kg/s),并根据样机的结构特点设计了履带式联合收获机载荷测试系统。同时，在田间试验时测得了主要工作部件的载荷信号，旨在为大喂入量履带式联合收获机的传动系统设计及动力分配提供数据支持。

关键词：联合收获机载荷测试大喂入量覆带式

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孤岛工作面沿空掘巷窄煤柱承载特征研究

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煤矿现代化 2025年第1期34卷 19-24页

作者：杜怀飞山西煤炭运销集团金辛达煤业有限公司山西临汾041000

孤岛工作面复杂的支承压力分布状态致使沿空巷道的围岩稳定性受到了极大影响。为探究孤岛工作面沿空掘巷窄煤柱承载特征,采用理论分析方法探究了煤柱塑性区宽度与多种因素相关性,运用数值模拟方法分析了支护参数对巷道围岩稳定性的影响... 详细信息

孤岛工作面复杂的支承压力分布状态致使沿空巷道的围岩稳定性受到了极大影响。为探究孤岛工作面沿空掘巷窄煤柱承载特征,采用理论分析方法探究了煤柱塑性区宽度与多种因素相关性,运用数值模拟方法分析了支护参数对巷道围岩稳定性的影响。研究表明:随着侧压系数的增加,塑性区宽度近似线性增加;而随着支护强度的增加,塑性区宽度则近似线性减小。凝聚力和摩擦角的增加均会导致塑性区宽度的减小,但减小的幅度逐渐变小。增加锚杆长度和预紧力可以扩大压动范围,有效控制巷道围岩变形;而间排距的调整需要在保证支护强度的前提下,选择适当的宽度以提高施工效率和经济性。通过工业实验,采用合理的煤柱宽度和支护结构后,巷道围岩变形趋于稳定,确保了巷道的安全与正常使用,验证了支护方案的有效性。

关键词：支护强度压动范围侧压系数数值模拟

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关于初中道德与法治分众式教学策略的思考与探索

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中学课程辅导 2025年第01期 108-110页

作者：杜运巧淄博师范高等专科学校附属中学

初中道德与法治分众式教学将“分众”思想运用于课堂教学中，以“兴趣化、素养化、能力化”分众教学策略，有效解决传统教学“一刀切”“满堂灌”“课堂活力不足”等问题，提高学生学习积极性和主动性，提升学校教育与教学效果，充分落... 详细信息

初中道德与法治分众式教学将“分众”思想运用于课堂教学中，以“兴趣化、素养化、能力化”分众教学策略，有效解决传统教学“一刀切”“满堂灌”“课堂活力不足”等问题，提高学生学习积极性和主动性，提升学校教育与教学效果，充分落实立德树人根本任务。

关键词：初中道德与法治兴趣化教学能力化教学素养化教学教学策略

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