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Superconductivity in kagome metal ThRu_(3)Si_(2)

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Chinese Physics B 2024年第5期33卷 36-41页

作者：刘艺厉静杨武璋卢佳依曹博雅李华旬柴万力武思祺李佰卓孙云蕾焦文鹤王操许晓峰任之曹光旱 School of Physics Zhejiang UniversityHangzhou 310058China Department of Applied Physics Zhejiang University of TechnologyHangzhou 310023China School of Science Westlake Institute for Advanced StudyWestlake UniversityHangzhou 310064China Department of Physics Shandong University of TechnologyZibo 255049China School of Information and Electrical Engineering Zhejiang University City CollegeHangzhou 310015China Interdisciplinary Center for quantum Information and State Key Laboratory of Silicon and Advanced Semiconductor MaterialsZhejiang UniversityHangzhou 310058China Collaborative Innovation centre of Advanced Microstructures Nanjing UniversityNanjing 210093China

We report the physical properties of ThRu_(3)Si_(2)featured with distorted Ru kagome *** combined experiments of resistivity,magnetization and specific heat reveal bulk superconductivity with T_(c)=3.8 *** specific heat jump and calculated electron–phonon coupling indicate a moderate coupled BCS *** comparison with LaRu_(3)Si_(2),the calculated electronic structure in ThRu_(3)Si_(2)shows an electron-doping effect with electron filling lifted from 100 meV below flat bands to 300 meV above *** explains the lower superconducting transition temperature and weaker electron correlations observed in ThRu_(3)Si_(2).Our work suggests the Tc and electronic correlations in the kagome superconductor could have an intimate connection with the flat bands.

关键词： superconductivity kagome lattice flat band

Single-cluster electronics using metallic clusters:Fabrications,regulations,and applications

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Nano Research 2024年第1期17卷 65-78页

作者： Caiyun Wei Wei Xu Shurui Ji Ruiyun Huang Junyang Liu Wenqiu Su Jie Bai Jiale Huang Wenjing Hong State Key Laboratory of Physical Chemistry of Solid Surfaces National Engineering Research Centre of Chemicals for Electronic ManufacturingCollege of Chemistry and Chemical Engineering&Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM)Xiamen UniversityXiamen 361005China

Metallic clusters,ranging from 1 to 2 nm in size,have emerged as promising candidates for creating nanoelectronic devices at the single-cluster *** the intermediate quantum properties between metals and semiconductors,these metallic clusters offer an alternative pathway to silicon-based electronics and organic molecules for miniaturized electronics with dimensions below 5 *** progress has been made in studies of single-cluster electronic ***,a clear guide for selecting,synthesizing,and fabricating functional single-cluster electronic devices is still *** review article provides a comprehensive overview of single-cluster electronic devices,including the mechanisms of electron transport,the fabrication of devices,and the regulations of electron transport ***,we discuss the challenges and future directions for single-cluster electronic devices and their potential applications.

关键词： single-cluster junctions electronic properties electron transport metallic clusters structure regulation

一步法构建S型BaTi_(2)O_(5)/g-C_(3)N_(4)异质结用于增强光催化析氢

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Science China Materials 2024年第7期67卷 2142-2152页

作者：李亚莹杨惠娟李吉利李晔飞任伟闻瑾肖琪许景三 State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan UniversityShanghai 200433China Physics Department Shanghai Key Laboratory of High Temperature Superconductorsand International Center of Quantum and Molecular StructuresMaterials Genome Instituteand State Key Laboratory of Advanced Special SteelShanghai UniversityShanghai 200444China School of Chemistry and Physics&centre for Materials Science Queensland University of TechnologyBrisbaneQLD 4001Australia

作为一种将太阳能有效转化为化学物质的方法,异质结光催化已被广泛研究.然而,开发高性能异质结光催化系统的主要挑战在于实现各组分之间电子的高效转移.本文通过将BaTi_(2)O_(5)纳米棒与g-C_(3)N_(4)薄片相结合,构建了一种新型S型异质... 详细信息

作为一种将太阳能有效转化为化学物质的方法,异质结光催化已被广泛研究.然而,开发高性能异质结光催化系统的主要挑战在于实现各组分之间电子的高效转移.本文通过将BaTi_(2)O_(5)纳米棒与g-C_(3)N_(4)薄片相结合,构建了一种新型S型异质结光催化剂.通过一步浸渍-还原法在g-C_(3)N_(4)纳米片上优先沉积Pt纳米颗粒作为助催化剂,增强了界面接触和强电子相互作用,这对光催化性能的提升至关重要.实验结果显示,所构建的P tImp/20BaTi_(2)O_(5)/g-C_(3)N_(4)光催化剂的最佳析氢速率为2587μmol g^(−1) h^(−1),并且在循环后依旧保持较高的稳定性.光电化学分析和理论计算进一步表明,BaTi_(2)O_(5)/g-C_(3)N_(4)异质结的构建导致了交错能带排列的形成和电荷载流子动力学的改善.这项工作凸显了利用新型S型异质结和可行的助催化剂促进光催化发展的重要性和可行性.

关键词： BaTizOs/g-C N_(4) S-scheme heterojunction cocata-lyst charge carrier dynamics photocatalytic H_(2)evolution

Crystalline-amorphization-recrystallization structural transition and emergent superconductivity in van der Waals semiconductor SiP under compression

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Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 115-122页

作者： Chunhua Chen Zhenyu Ding Yonghui Zhou Yifang Yuan Nixian Qian Jing Wang Shuyang Wang Ying Zhou Chao An Min Zhang Xuliang Chen Xiaoping Yang Mingliang Tian Zhaorong Yang Anhui Key Laboratory of Low-Energy quantum Materials and Devices High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China Key Laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityHefei 230601China Institutes of Physical Science and Information Technology Anhui UniversityZhengzhou 450001China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

van der Waals(vdW)semiconductors have gained significant attention due to their unique physical properties and promising applications,which are embedded within distinct crystallographic ***,we report a pressure-induced crystallineamorphization-recrystallization transition under compression in binary vdW semiconductor *** compression to 52 GPa,bulk SiP undergoes a consecutive phase transition from pristine crystalline to amorphous phase,ultimately to recrystallized *** employing synchrotron X-ray diffraction experiments in conjunction with high-pressure crystal structure searching techniques,we reveal that the recrystallized Si P hosts a tetragonal structure(space group I4mm)and further transforms partially into a cubic phase(space group Fm3m).Consistently,electrical transport and alternating-current magnetic susceptibility measurements indicate the presence of three superconducting phases,which are embedded in separate crystallographic symmetries—the amorphous,tetragonal,and cubic ***,a high superconducting transition temperature of 12.3 K is observed in its recovered tetragonal phase during *** findings uncover a novel phase evolution path and elucidate a pressure-engineered structure-property relationship in vdW semiconductor *** results not only offer a new platform to explore the transformation between different structures and functionalities,but also provide new opportunities for the design and exploration of advanced devices based on vdW materials.

关键词： recrystallization transition amorphous

Fabrication and characterization of ultra-low noise narrow and wide band Josephson parametric amplifiers

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Chinese Physics B 2017年第9期26卷 198-203页

作者：黄克强郭秋江宋超郑亚锐邓辉吴玉林金贻荣朱晓波郑东宁 Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences Department of Physics Zhejiang University CAS centre for Excellence and Synergetic Innovation centre in quantum Information and quantum Physics University of Science and Technology of China

We have fabricated two types of lumped-element Josephson parameter amplifiers（JPAs） by using a multilayer microfabrication process involving wet etching of Al films. The first type is a narrow band JPA which shows typical gain above14 dB in a bandwidth around 35 MHz. The second type is a wideband JPA which is coupled to an input 50Ω transmission line via an impedance transformer that changes the impedance from about 15 Ω on the non-linear resonator side to 50 Ωon the input transmission line side. The wideband JPA could operate in a 200 MHz range with a gain higher than 14 d *** amplifiers were used for superconducting qubit readout. The results showed that the signal to noise ratio and hence the readout fidelity were improved significantly.

关键词： Josephson parameter amplifier multilayer micro-fabrication qubit state readout

Controllable growth of two-dimensional quantum materials

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Science China(Physics,Mechanics & Astronomy) 2023年第11期66卷 2-16页

作者： Xin Sui Zhibin Zhang Kaihui Liu International centre for quantum Materials Collaborative Innovation Centre of Quantum MatterPeking UniversityBeijing100871China State Key Laboratory for Mesoscopic Physics Frontiers Science Centre for Nano-optoelectronicsSchool of PhysicsPeking UniversityBeijing100871China Songshan Lake Materials Laboratory Institute of PhysicsChinese Academy of SciencesDongguan523808China

Two-dimensional(2D)quantum materials have attracted extensive attention due to their superior properties at the atomic *** novel physical phenomena,including the quantum Hall effect,fractional quantum Hall effect,quantum anomalous Hall effect and topological superconductor phase or topological insulator phase,have been discovered on different2D quantum *** the past decades,various technologies have been developed to prepare the 2D quantum materials and all of them have demonstrated their specific *** this review,we comprehensively summarize the commonly used growth methods for the 2D quantum materials and discuss the corresponding controllable growth ***,we provide a summary and a perspective for future studies.

关键词： 2D quantum material controllable growth growth methods

A review on the transformation of birnessite in the environment:Implication for the stabilization of heavy metals

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Journal of Environmental Sciences 2024年第5期139卷 496-515页

作者： Miao Shi Qingzhu Li Qingwei Wang Xuelei Yan Bensheng Li Linhai Feng Chao Wu Rongrong Qiu Hongkai Zhang Zhihui Yang Weichun Yang Qi Liao Liyuan Chai School of Metallurgy and Environment Central South UniversityChangsha 410083China National Engineering Research centre for Control and Treatment ofHeavy Metal Pollution Central South UniversityChangsha 410083China Water Pollution Control Technology Key Lab of Hunan Province Changsha 410083China

Birnessite is ubiquitous in the natural environment where heavy metals are retained and easily *** surface properties and structure of birnessite change with the changes in external environmental conditions,which also affects the fate of heavy *** the effect and mechanism of the birnessite phase transition process on heavy metals is the key to taking effective measures to prevent and control heavy metal ***,the four transformation pathways of birnessite are summarized first in this ***,the relationship between transformation pathways and environmental conditions is *** relevant environmental conditions include abiotic(e.g.,co-existing ions,pH,oxygen pressure,temperature,electric field,light,aging,pressure)and biotic factors(e.g.,microorganisms,biomolecules).The phase transformation is achieved by the key intermediate of Mn(Ⅲ)through interlayer-condensation,folding,neutralizationdisproportionation,and dissolution-recrystallization *** AOS(average oxidation state)of Mn and interlayer spacing are closely correlated with the phase transformation of *** but not least,the mechanisms of heavy metals immobilization in the transformation process of birnessite are summed *** involve isomorphous substitution,redox,complexation,hydration/dehydration,*** transformation of birnessite and its implication on heavy metals will be helpful for understanding and predicting the behavior of heavy metals and the crucial phase of manganese oxides/hydroxides in natural and engineered environments.

关键词： Birnessite Transformation Heavy metals Pathways Mechanism

Entanglement and nonlocality in multi-particle systems

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Frontiers of physics 2012年第1期7卷 72-85页

作者： Margaret D. Reid (1) Qiong-Yi He (1) Peter D. Drummond (1) 1. ARC centre of Excellence for quantum-Atom Optics Centre for Atom Optics and Ultrafast Spectroscopy Swinburne University of Technology Melbourne 3122 Australia

Entanglement, the Einstein-Podolsky Rosen （EPR） paradox and Bell＇s failure of local-hidden- variable （LHV） theories are three historically famous forms of ＂quantum nonlocality＂. We give experimental criteria for these three forms of nonlocality in multi-particle systems, with the aim of better understanding the transition from microscopic to macroscopic nonlocality. We examine the nonlocality of N separated spin J systems. First, we obtain multipartite Bell inequalities that address the correlation between spin values measured at each site, and then we review spin squeezing inequal- ities that address the degree of reduction in the variance of collective spins. The latter have been particularly useful as a tool for investigating entanglement in Bose Einstein eondensates （BEC）. We present solutions for two topical quantum states： multi-qubit Greenberger-Horne Zeilinger （GHZ） states, and the ground state of a two-well BEC.

关键词： entanglement quantum nonlocality multi-particle two-well Bose-Einstein condensates(BEC)

Many-body theories of density response for a strongly correlated Fermi gas

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Frontiers of physics 2012年第1期7卷 98-108页

作者： Hui Hu (1) 1. ARC centre of Excellence for quantum-Atom Optics Centre for Atom Optics and Ultrafast Spectroscopy Swinburne University of Technology Melbourne 3122 Australia

Recent breakthroughs in the creation of ultracold atomic gases in the laboratory have ushered in major changes in physical science. Many novel experiments are now possible, with an unprecedented control of interaction, geometry and purity. quantum many-body theory is facing severe challenges in quantitatively understanding new experimental results. Here, we review some recently developed theoretical techniques that provide successful predictions for density response of a strongly correlated atomic Fermi gas. These include the strong-coupling random-phase approximation theory, high- temperature quantum virial expansion, and asymptotically exact Tan relations applicable at large momentum.

关键词： quantum many-body theory Fermi gas