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Identifying the convergent reaction path from predesigned assembled structures: Dissymmetrical dehalogenation of Br_(2)Py on Ag(111)

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Nano Research 2021年第12期14卷 4704-4713页

作者： Jinping Hu Zhaofeng Liang Kongchao Shen Lei Xie Huan Zhang Chaoqin huang yaobo huang Han huang Jianxin Tang Zheng Jiang Miao Yu Fei Song Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai201000China University of Chinese Academy of Sciences Beijing100100China Shanghai Synchrotron Radiation Faciality Zhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesShanghai201000China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou215123China School of Physics Science and Electronics Central South UniversityChangsha410083China State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin150001China

On-surface Ullmann coupling has been intensely utilized for the tailor-made fabrication of conjugated frameworks towards molecular electronics, however, reaction mechanisms are still limitedly understood. Herein, we provide a comprehensive elucidation of the surface Ullmann coupling of 2,7-dibromopyrene (Br2Py) on Ag(111) by scanning tunnelling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and density function theory (DFT), and reveal that the Ullmann reaction path is unique regardless of predesigned assembled structures. By manipulating deposition conditions, diverse assembled architectures have been constructed for Br2Py on Ag(111), including the ladder phase, parallel arrangement, hexagonal patterns from monomers or Kagome lattices based on organometallic (OM) dimers. Intriguingly, stepwise annealing leads to an identical reaction diagram for the surface Ullmann coupling from individual assembled structures convergent into the brick-wall-pattern OM dimers first, which is deemed to be a stable phase, and then into elongated OM chains in order and eventually long-range polymers with direct C-C coupling. While the reaction mechanism is demonstrated to be dominated by the metal coordinated and halogen bonding motifs, interestingly, it has also been revealed that surface adatoms and dissociated Br atoms play a crucial role in coupling reactions. In contrast to previous reports demonstrating the manipulation of Ullmann reactions by preassembled strategy, herein, weak intermolecular interaction in assembled nanostructures is immediately suppressed by strong covalent bonding during reactions. Importantly, our report proposes essential insights on fundamental understanding of surface Ullmann coupling towards high-yield surface synthesis.

关键词： self-assembly Ullmann coupling organometallic intermediates reaction path scanning tunneling microscopy

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Consecutive topological transitions of helical Fermi arcs at saddle points in CoSi

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Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 97-103页

作者： Zhicheng Rao Shangjie Tian Shunye Gao Quanxin Hu Wenhui Fan Jierui huang Cenyao Tang yaobo huang Hechang Lei Yujie Sun Tian Qian Hong Ding Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Department of Physics South University of Science and TechnologyShenzhen 518055China

The CoSi family hosts unconventional topological nodes with nonzero Chern *** nontrivial topology is manifested by conspicuous surface Fermi arcs connecting surface projections of the ***,using angle-resolved photoemission spectroscopy,we have systematically investigated the(001)surface states of pristine and Ni-doped Co *** surface states form saddle-like band structures at/near the time-reversal invariant point near the Fermi *** Fermi arcs undergo consecutive Lifshitz transitions at the saddle points X,leading to changes of the Fermi arc *** the density of states has a van Hove singularity at the saddle points,exotic many-body physical phenomena may emerge accompanied by the topological transitions of surface Fermi arcs.

关键词： topological transition Fermi arcs saddle point

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Anisotropic magnetism and band evolution induced by ferromagnetic phase transition in titanium-based kagome ferromagnet SmTi_3Bi_4

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Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 137-145页

作者： Zhe Zheng Long Chen Xuecong Ji Ying Zhou Gexing Qu Mingzhe Hu yaobo huang Hongming Weng Tian Qian Gang Wang Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Physics and Engineering Henan University of Science and TechnologyLuoyang 471023China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Topological Quantum Computation Chinese Academy of SciencesBeijing 100190China

Kagome magnets with diverse topological quantum responses are crucial for next-generation topological *** anisotropic magnetism and band evolution induced by ferromagnetic phase transition(FMPT)is reported in a newly discovered titanium-based kagome ferromagnet Sm Ti3Bi4,which features a distorted Ti kagome lattice and Sm atomic zig-zag ***-dependent resistivity,heat capacity,and magnetic susceptibility reveal a ferromagnetic ordering temperature Tc of23.2 K.A large magnetic anisotropy,observed by applying the magnetic field along three crystallographic axes,identifies the b axis as the easy ***-resolved photoemission spectroscopy with first-principles calculations unveils the characteristic kagome motif,including the Dirac point at the Fermi level and multiple van Hove ***,a band splitting and gap closing attributed to FMPT is observed,originating from the exchange coupling between Sm 4 f local moments and itinerant electrons of the kagome Ti atoms,as well as the time-reversal symmetry breaking induced by the long-range ferromagnetic *** the large in-plane magnetization and the evolution of electronic structure under the influence of ferromagnetic ordering,such materials promise to be a new platform for exploring the intricate electronic properties and magnetic phases based on the kagome lattice.

关键词： kagome lattice anisotropic magnetism band splitting ferromagnetic phase transition ARPES

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Electronic structure of LaIrIn5and f-electron character in its related Ce-115 compounds

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Science China(Physics,Mechanics & Astronomy) 2020年第11期63卷 90-97页

作者： Rui Zhou XueBing Luo ZhaoFeng Ding Lei Shu XingYu Ji ZiHao Zhu yaobo huang DaWei Shen ZhengTai Liu ZhongHao Liu Yun Zhang QiuYun Chen Science and Technology on Surface Physics and Chemistry Laboratory Mianyang 621908China Department of Engineering Physics Tsinghua UniversityBeijing 100084China State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China Center of Excellence in Superconducting Electronics State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

LaIrIn5 is a reference compound of the heavy-fermion superconductor *** lack of f electrons in LaIrIn5 indicates that there should not be any f electron participating in the construction of its Fermi *** the electronic structure comparison between LaIrIn5 and LaIrIn5 provides a good platform to study the properties of f *** angle-resolved photoemission spectroscopy(ARPES)measurements and density functional theory(DFT)calculations are performed to study the electronic structures of LaIrIn5 and *** find the valence band structures of the two materials are similar to each other,except for the absence of f bands in *** analyzing the Fermi crossings of the three conduction bands of the two materials quantitatively,we find the volumes of the electron pocketsαandβaround the M′point become larger from LaIrIn5 to LaIrIn5,while the hole pocketγaround theΓ′point becomes *** with the calculation results,we confirm that this is mainly originated from the f-electron contribution,while the lattice-constant difference between LaIrIn5 and LaIrIn5 only has a finite *** also give a summary of the f-electron character in its related Ce-115 heavy fermion *** results may be essential for the complete microscopic understanding of the 115 compounds and the related heavy-fermion systems.

关键词： ARPES DFT heavy fermion LaIrIn5

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Quantization of the band at the surface of charge density wave material 2H-TaSe_(2)

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Chinese Physics B 2021年第4期30卷 106-112页

作者： Man Li Nan Xu Jianfeng Zhang Rui Lou Ming Shi Lijun Li Hechang Lei Cedomir Petrovic Zhonghao Liu Kai Liu yaobo huang Shancai Wang Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Institute of Advanced Studies Wuhan UniversityWuhan 430072China Swiss Light Source Paul Scherrer InstituteCH-5232 VilligenSwitzerland Chongqing Technology and Busineee University Chongqing 400067China Condensed Matter Physics and Materials Science Department Brookhaven National LaboratoryUptonNY 11973USA State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics SIMITChinese Academy of SciencesShanghai 200050China

By using angle-resolvea photoemission spectroscopy(ARPES) combined with the first-principies electronic structure calculations,we report the quantized states at the surface of a single crystal 2 H-TaSe_(2).We have observed sub-bands of quantized states at the three-dimensional Brillouin zone center due to a highly dispersive band with light effective mass along k_(z) *** quantized sub-bands shift upward towards E_(F) while the bulk band at Γ shifts downward with the decrease of temperature across charge density wave(CDW) *** band shifts could be intimately related to the *** neither the two-dimensional Fermi-surface nesting nor purely strong electron-phonon coupling can explain the mechanism of CDW in 2 H-TaSe_(2),our experiment may ignite the interest in understanding the CDW mechanism in this family.

关键词： angle-resolved photoemission spectroscopy transition metal dichalcogenide TaSe_(2)

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Hybridization Effects Revealed by Angle-Resolved Photoemission Spectroscopy in Heavy-Fermion Ce2IrIn8

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Chinese Physics Letters 2019年第9期36卷 36-40页

作者： Haijiang Liu Yuanji Xu Yigui Zhong Jianyu Guan Lingyuan Kong Junzhang Ma yaobo huang Qiuyun Chen Genfu Chen Ming Shi Yi-feng Yang Hong Ding Beijing National Laboratory forCondensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing100190 Schoolof Physics University of Chinese AcademyofSciencesBeijing100190 Swiss LightSource PaulScherrer InstituteCH5232Villigen PSISwitzerland Shanghai Synchrotron Radiation Facility Shanghai Institute of AppliedPhysicsChinese Academy of SciencesShanghai201204 Science and Technology on Surface Physics and Chemistry Laboratory Mianyang621908 SongshanLakeMaterials Laboratory Dongguan523808

We utilize high-resolution resonant angle-resolved photoemission spectroscopy(ARPES)to study the band structure and hybridization effect of the heavy-fermion compound Ce2 *** observe a nearly flat band at the binding energy of 7 meV below the coherent temperature Tcoh^40 K,which characterizes the electrical resistance maximum and indicates the onset temperature of ***,the Fermi vector and the Fermi surface volume have little change around Tcoh,which challenges the widely believed evolution from a hightemperature small Fermi surface to a low-temperature large Fermi *** experimental results of the band structure fit well with the density functional theory plus dynamic mean-field theory calculations.

关键词： ARPES Hybridization Effects Revealed by Angle-Resolved Photoemission Spectroscopy in Heavy-Fermion Ce2IrIn8 Ce

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Growth and characterization of Bi(110)/CrTe_(2) heterostructures:Exploring interplay between magnetism and topology

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Chinese Physics B 2024年第2期33卷 449-455页

作者：袁震宇杨发枝吕佰晴黄耀波钱天徐金朋丁洪 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences(CAS)Beijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Tsung-Dao Lee Institute and School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China School of Physics Shandong UniversityJi’nan 250100 China

The interplay between topology and magnetism is vital for realizing exotic quantum phenomena,significant examples including quantum anomalous Hall effect,axion insulators,and high-order topological *** states host great potential for future applications in high-speed and low-consumption electronic *** being extensively investigated,practical platforms are still *** this work,with molecular beam epitaxy(MBE),we provide the first experimental report on high-quality Bi(110)/CrTe_(2) magnetic *** employing in-situ high-resolution scanning tunneling microscopy,we are able to examine the interaction between magnetism and *** is a potential edge state at an energy level above the Fermi level,but no edge states observed near the Fermi level The absence of high-order topological corner states near EF highlights the importance of lattice matching and interface engineering in designing high-order topological *** study provides key insights into the interplay between two-dimensional magnetic and topological materials and offers an important dimension for engineering magnetic topological states.

关键词： bismuth(110) chromium ditelluride(CrTe_(2)) topological states scanning tunneling microscopy(STM)

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基于PWA融合模型的注塑过程保压段建模及控制策略

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化工学报 2020年第3期71卷 1103-1110页

作者：黄耀波刘佳新徐祖华赵均邵之江浙江大学控制科学与工程学院工业控制技术国家重点实验室浙江杭州310027

注塑过程是典型的批次过程,由注射、保压、冷却等阶段构成。保压段是决定制品质量的一个重要阶段,且具有较大的非线性和时变性。分段仿射(piece-wise affine, PWA)模型能够有效描述保压段的特性,但是PWA模型硬切换方式会导致输出跳变问... 详细信息

注塑过程是典型的批次过程,由注射、保压、冷却等阶段构成。保压段是决定制品质量的一个重要阶段,且具有较大的非线性和时变性。分段仿射(piece-wise affine, PWA)模型能够有效描述保压段的特性,但是PWA模型硬切换方式会导致输出跳变问题,因此提出一种基于时间划分的PWA融合模型,在子模型切换过程中引入切换区间,通过线性加权方法进行模型融合,并采用基于分离最小二乘的辨识方法进行参数估计。在此基础上,设计了基于内模整定的多模型PID控制方法。注塑机实验结果表明了算法的有效性。

关键词：注塑过程 PWA融合模型分离最小二乘多模型PID控制

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无镀铜实心焊丝抗锈及工艺性能的研究现状

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机械制造文摘（焊接分册） 2019年第4期 38-44页

作者：黄耀波福建省特种设备检验研究院

无镀铜焊丝是应用纳米和现代金属间化合物胶体涂层相结合的新型焊接材料,对焊丝表面进行特殊的涂层处理技术,因此其也被称为涂层焊丝或活性焊丝。文中主要阐述了无镀铜焊丝在抗锈性能、电弧稳定性、熔滴过渡形式、飞溅率及发尘量、导电... 详细信息

无镀铜焊丝是应用纳米和现代金属间化合物胶体涂层相结合的新型焊接材料,对焊丝表面进行特殊的涂层处理技术,因此其也被称为涂层焊丝或活性焊丝。文中主要阐述了无镀铜焊丝在抗锈性能、电弧稳定性、熔滴过渡形式、飞溅率及发尘量、导电嘴磨损等方面的国内外研究现状,并探讨了无镀铜焊丝未来研究的发展方向。

关键词：无镀铜焊丝防锈性能熔滴过渡形式飞溅率发尘量

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Electronic Structure of the Weak Topological Insulator Candidate Zintl Ba_(3)Cd_(2)Sb_(4)

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Chinese Physics Letters 2023年第4期40卷 44-49页

作者：黄杰瑞张坦徐升饶志成李佳俊刘俊德高顺业黄耀波朱文亮夏天龙翁红明钱天 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Physics Renmin University of ChinaBeijing 100872China Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710119China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

One of the greatest triumph of condensed matter physics in the past ten years is the classification of materials by the principle of *** existence of topological protected dissipationless surface state makes topological insulators great potential for applications and hotly ***,compared with the prosperity of strong topological insulators,theoretical predicted candidate materials and experimental confirmation of weak topological insulators(WTIs) are both extremely *** combining systematic first-principles calculation and angle-resolved photoemission spectroscopy measurements,we have studied the electronic structure of the dark surface of the WTI candidate Zintl Ba_(3)Cd_(2)Sb_(4)and another related material Ba_(3)Cd_(2)As_(4).The existence of two Dirac surface states on specific side surfaces predicted by theoretical calculations and the observed two band inversions in the Brillouin zone give strong evidence to prove that the Ba_(3)Cd_(2)Sb_(4)is a *** spectroscopic characterization of this Zintl Ba_(3)Cd_(2)N_(4)(N = As and Sb) family materials will facilitate applications of their novel topological properties.

关键词： properties topological rare

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