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Observations of nodal lines in the topological semimetal ZrSnTe

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Science China(Physics,Mechanics & Astronomy) 2020年第2期63卷 111-116页

作者： Bo Chen Bo Zhang JiHai Yu fucong fei Muhammad Naveed Yi Zhang Zhe Sun XianGang Wan FengQi Song National Laboratory of Solid State Microstructure School of PhysicsNanjing UniversityNanjing 210093China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Performing angle-resolved photoemission spectroscopy(ARPES) and theoretical calculations for ZrSnTe, we find a nodal line in the kx-ky plane with a tiny gap and two nodal lines without gaps along the kzdirection. The constant energy contours are plotted in the kx-ky plane at a photon energy of 30 e V to examine the gapping feature of the nodal line. In addition, we depict the band dispersions along the Γ-M and Γ-X directions from the ARPES images at photon energies ranging from 24 to 40 e V. The kz mapping confirms the presence of stable Dirac points with obvious kzdependences along the M-A and X-R directions. In this paper, we report the two types of nodal lines associated with the theoretical local-density approximation calculations, broadening the horizons of nodal-line semimetal research.

关键词： nodal-line semimetals ZrSnTe ARPES

Tunable optical topological transitions of plasmon polaritons in WTe_(2) van der Waals films

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Light(Science & Applications) 2023年第9期12卷 1807-1817页

作者： Yuangang Xie Chong Wang fucong fei Yuqi Li Qiaoxia Xing Shenyang Huang Yuchen Lei Jiasheng Zhang Lei Mu Yaomin Dai Fengqi Song Hugen Yan State Key Laboratory of Surface Physics Key Laboratory of Micro and NanoPhotonic Structures(Ministry of Education)and Department of PhysicsFudan University200433 ShanghaiChina Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of Technology100081 BeijingChina Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of Technology100081 BeijingChina National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructuresand College of PhysicsNanjing University210093 NanjingChina Atom Manufacturing Institute(AMI) 211805 NanjingChina Center for Superconducting Physics and Materials National Laboratory of Solid State Microstructures and Department of PhysicsNanjing University211805 NanjingChina

Naturally existing in-plane hyperbolic polaritons and the associated optical topological transitions,which avoid the nano-structuring to achieve hyperbolicity,can outperform their counterparts in artificial *** plasmon polaritons are rare,but experimentally revealed recently in WTe_(2)van der Waals thin *** from phonon polaritons,hyperbolic plasmon polaritons originate from the interplay of free carrier Drude response and interband transitions,which promise good intrinsic ***,tunable in-plane hyperbolic plasmon polariton and its optical topological transition of the isofrequency contours to the elliptic topology in a natural material have not been *** we demonstrate the tuning of the optical topological transition through Mo doping and *** optical topological transition energy is tuned over a wide range,with frequencies ranging from 429 cm^(−1)(23.3 microns)for pure WTe_(2)to 270 cm^(−1)(37.0 microns)at the 50%Mo-doping level at 10 ***,the temperature-induced blueshift of the optical topological transition energy is also revealed,enabling active and reversible ***,the localized surface plasmon resonance in skew ribbons shows unusual polarization dependence,accurately manifesting its topology,which renders a reliable means to track the topology with far-field *** results open an avenue for reconfigurable photonic devices capable of plasmon polariton steering,such as canaling,focusing,and routing,and pave the way for low-symmetry plasmonic nanophotonics based on anisotropic natural materials.

关键词： topological transitions polar

Self-templated formation of twin-like metal-organic framework nanobricks as pre-catalysts for efficient water oxidation

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Nano Research 2022年第4期15卷 2887-2894页

作者： fei-Xiang Ma fucong Lyu Yingxue Diao BinBin Zhou Jianghua Wu Fengwen Kang Zebiao Li Xufen Xiao Peng Wang Jian Lu Yang Yang Li Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China Hong Kong Branch of National Precious Metals Material Engineering Research Center City University of Hong KongHong Kong 999077China Department of Mechanical Engineering City University of Hong KongGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceHong Kong 999077China Department of Material Science and Engineering City University of Hong KongHong Kong 999077China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesCollaborative Innovation Center of Advanced Microstructures and Center for the Microstructures of Quantum MaterialsNanjing UniversityNanjing 210093China CityU-Shenzhen Futian Research Institute No.3Binglang RoadFubao StreetFutian DistrictShenzhen 518045China

Fabrication of single-crystalline metal-organic framework(MOF)hollow nanostructures with two-dimensional(2D)morphologies is a challenging ***,twin-like MOF nanobricks,a quasi-hollow 2D architecture,with multi-metal nodes and replaceable organic ligands,are uniformly and firmly grown on conductive Ni foam through a generic one-pot *** formation process of twin-like MOF nanobricks mainly includes selective epitaxial growth of Fe-rich MOF layer and simultaneously dissolution of the pre-formed Ni-rich metal-organic frameworks(MOFs),all of which can be ascribed to a special self-templated *** fantastic structural merits of twin-like MOF nanobrick arrays,featuring highly exposed active sites,remarkable electrical conductivity,and hierarchical porosities,enable this material for efficient *** bimetallic NiFe-MOFs grown on Ni foam as an example,the resultant twin-like nanobrick arrays can be directly utilized as three-dimensional(3D)integrated electrode for high-performance water oxidation in 1 M KOH with a low overpotential,fast reaction kinetics(28.5 mV·dec^(-1)),and superb ***,the unstable NiFe-MOFs were served as an oxygen evolution reaction(OER)pre-catalyst and the single-crystalline NiFe-MOF precursor can be in-situ topochemically regulated into porous and lowcrystalline NiFeOx nanosheets during the OER *** work extends the hollowing strategy to fabricate hollow MOFs with 2D architectures and highlights their direct utilization for advanced electrocatalysis.

关键词： twin-like structures metal-organic frameworks oxygen evolution reaction self-templated pre-catalysts

Tunable ultrathin dual-phase P-doped Bi_(2)MoO_(6) nanosheets for advanced lithium and sodium storage

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Nano Research 2022年第7期15卷 6128-6137页

作者： fucong Lyu Zhe Jia Shanshan Zeng fei-Xiang Ma Lulu Pan Lizi Cheng Yan Bao Ligang Sun Weihui Ou Peng Du Yang Yang Li Jian Lu Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China Hong Kong Branch of National Precious Metals Material Engineering Research Centre City University of Hong KongKowloonHong KongChina School of Materials Science and Engineering Southeast UniversityNanjing 211189China School of Science Harbin Institute of TechnologyShenzhen 518055China Department of Mechanical Engineering City University of Hong KongKowloonHong KongChina CityU-Shenzhen Futian Research Institute Shenzhen 518045China Center of Super-Diamond and Advanced Films(COSDAF) City University of Hong KongKowloonHong KongChina Department of Material Science and Engineering City University of Hong KongKowloonHong KongChina

The construction of electrode materials for lithium-ion batteries(LIBs)and sodium-ion batteries(SIBs)has gradually been an appealing and attractive technology in energy storage research *** the present work,a facile strategy of synthesizing ultrathin amorphous/nanocrystal dual-phase P-doped Bi_(2)MoO_(6)(denoted as P-BiMO)nanosheets via a one-step wet-chemical synthesis approach is *** distinct from conventional two-dimensional(2D)nanosheets,our newly developed ultrathin P-BiMO nanosheets exhibit a unique tunable amorphous/nanocrystalline dual-phase structure with several compelling advantages including fast ion exchange ability and superb volume change buffer *** experimental results reveal that our prepared P-BiMO-6 electrode delivers an excellent reversible capacity of 509.6 mA·g^(−1) after continuous 1,500 cycles at the current densities of 1,500 mA·g^(−1) and improved rate performance for *** the meanwhile,the P-BiMO-6 electrode also shows a reversible capacity of 300.6 mA·g^(−1) after 100 cycles at 50 mA·g^(−1) when being used as the SIBs *** present work uncovers an effective dual-phase nanosheet structure to improve the performance of batteries,providing an attractive paradigm to develop superior electrode materials.

关键词： amorphous/nanocrystalline dual-phase structure ultrathin nanosheets P-doped Bi_(2)MoO_(6) anode materials lithium-ion batteries sodium-ion batteries

基于传感器控制的多级磁阻式电磁炮制作与研究

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物理与工程 2013年第1期23卷 25-28,35页

作者：费付聪李渊成唐勇陆媛媛倪广源黄晓琴南京师范大学江苏南京210046

针对磁阻式电磁发射器的技术特点,设计了一种基于传感器控制的多级电磁炮射击装置,并成功试制了电磁发射装置样品,通过单级加电压和改变炮弹初始位置的方法对样品进行试射,并在此基础上加装三级加速,从而得出三级电磁炮的发射最优配置,... 详细信息

针对磁阻式电磁发射器的技术特点,设计了一种基于传感器控制的多级电磁炮射击装置,并成功试制了电磁发射装置样品,通过单级加电压和改变炮弹初始位置的方法对样品进行试射,并在此基础上加装三级加速,从而得出三级电磁炮的发射最优配置,试验证明,在280V电压下,炮弹的出口速度达到27.52m/s.

关键词：磁阻型线圈发射多级光电传感器

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桉树生态经营技术研究

广西林业科学 2021年第3期50卷 243-251页

作者：李志辉王佩兰李何陆湘云黄木易蒋燚刘菲梁燕芳韦铄星何林骏颜忠鹏王毓靖黄荣林蒙好生何春魏国余苏福聪中南林业科技大学湖南长沙410004 广西壮族自治区国有高峰林场广西南宁530001 广西壮族自治区林业科学研究院广西南宁530002 湖南永州市林业局湖南永州425000 中国林业科学研究院亚热带林业实验中心江西宜春336600 广西壮族自治区国有七坡林场广西南宁530225

以桉树(Eucalyptus spp.)混交林和纯林为研究对象,集成树种选择和林分结构调控等定向培育技术,构建桉树速生丰产栽培技术体系。结果表明,混交可促进桉树生长,提高林分生物量,改善土壤理化性质,桉树×红锥(Castanopsis hystrix)混交林的... 详细信息

以桉树(Eucalyptus spp.)混交林和纯林为研究对象,集成树种选择和林分结构调控等定向培育技术,构建桉树速生丰产栽培技术体系。结果表明,混交可促进桉树生长,提高林分生物量,改善土壤理化性质,桉树×红锥(Castanopsis hystrix)混交林的营林效果最好。在不同间伐强度桉树纯林林下套种米老排(Mytilaria laosensis)、红椎和火力楠(Michelia macclurei),强度间伐处理下,桉树的生长和套种树种的蓄积量表现较好;改培后的混交林能有效缓解土壤酸化,提高土壤养分含量。在桉树大径材培育中,可采用强度间伐,间伐7年后林分的蓄积量比对照林分高出20.67%。

关键词：森林培育桉树生态经营速生丰产大径材