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Imaging momentum-space Cooper pair formation and its competition with the charge density wave gap in a kagome superconductor

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Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 142-150页

作者： Yiming Sun Yubing Tu Yang Luo Shuikang Yu Hongyu Li Yunmei Zhang Ping Wu Zhuying Wang Fan Zhang Wanru Ma Zuowei Liang Jianjun Ying Tao Wu Ziji Xiang Junfeng He Lei Shan Zhenyu Wang xianhui chen Department of Physics CAS Key Laboratory of Strongly Coupled Quantum Matter Physicsand Hefei National LaboratoryUniversity of Science and Technology of ChinaHefei 230026China Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

The superconducting ground state of kagome metals AV_(3)Sb_(5)(where A stands for K,Rb,or Cs)emerges from an exotic charge density wave(CDW)state that potentially breaks both rotational and time reversal ***,the specifics of the Cooper pairing mechanism,and the nature of the interplay between these two states remain elusive,largely due to the lack of momentum-space(k-space)superconducting energy gap *** implementing Bogoliubov quasiparticle interference(B QPI)imaging,we obtain k-space information on the multiband superconducting gap structureΔ_(SC)^(i)(k)in pristine CsV_(3)Sb_(5).We show that the estimated energy gap on the vanadium d_(xy/x^(2)-y^(2))orbital is anisotropic but nodeless,with a minimal value located near the M ***,a comparison ofΔ_(SC)^(i)(k)with the CDW gapΔ_(CDW)^(i)(k)obtained by angle-re solved photoemission spectro scopy(ARPES)reveals direct k-space competition between the se two order parameters,i.e.,the opening of a large(small)CDW gap at a given momentum corresponds to a small(large)superconducting *** the long-range CDW order is suppressed by replacing vanadium with titanium,we find a nearly isotropic energy gap on both the V and Sb *** information will be critical for identifying the microscopic pairing mechanism and its interplay with intertwined electro nic orders in this kagome superconductor family.

关键词： kagome lattice charge density wave superconducting energy gap scanning tunneling microscopy

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Dimensionality-driven metal to Mott insulator transition in two-dimensional 1T-TaSe2

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National Science Review 2024年第3期11卷 108-118页

作者： Ning Tian Zhe Huang Bo Gyu Jang Shuaifei Guo Ya-Jun Yan Jingjing Gao Yijun Yu Jinwoong Hwang Cenyao Tang Meixiao Wang Xuan Luo Yu Ping Sun Zhongkai Liu Dong-Lai Feng xianhui chen Sung-Kwan Mo Minjae Kim Young-Woo Son Dawei Shen Wei Ruan Yuanbo Zhang State Key Laboratory of Surface Physics New Cornerstone Science Laboratory and Department of PhysicsFudan University Shanghai Qi Zhi Institute Shanghai Research Center for Quantum Sciences Institute for Nanoelectronic Devices and Quantum Computing Fudan University Zhangjiang Fudan International Innovation Center Fudan University State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of Sciences School of Physical Science and Technology ShanghaiTech University Korea Institute for Advanced Study School of Emerging Technology and Department of Physics University of Science and Technology of China Advanced Light Source Lawrence Berkeley National Laboratory ShanghaiTech Laboratory for Topological Physics Key Laboratory of Materials Physics Institute of Solid State Physics Hefei Institutes of Physical ScienceChinese Academy of Sciences High Magnetic Field Laboratory Hefei Institutes of Physical Science Chinese Academy of Sciences Collaborative Innovation Centre of Advanced Microstructures Nanjing University Department of Physics University of Science and Technology of China and Key Laboratory of Strongly Coupled Quantum Matter Physics Chinese Academy of Sciences National Synchrotron Radiation Laboratory University of Science and Technology of China

Two-dimensional materials represent a major frontier for research into exotic many-body quantum phenomena. In the extreme two-dimensional limit, electron-electron interaction often dominates over other electronic energy scales, leading to strongly correlated effects such as quantum spin liquid and unconventional *** dominance is conventionally attributed to the lack of electron screening in the third dimension. Here, we discover an intriguing metal to Mott insulator transition in 1T-TaSe2that defies conventional wisdom. Specifically, we find that dimensionality crossover, instead of reduced screening, drives the transition in atomically thin 1T-TaSe2. A dispersive band crossing the Fermi level is found to be responsible for the bulk metallicity in the material. Reducing the dimensionality,however, effectively quenches the kinetic energy of these initially itinerant electrons, and drives the material into a Mott insulating *** dimensionality-driven metal to Mott insulator transition resolves the long-standing dichotomy between metallic bulk and insulating surface of 1T-TaSe2. Our work further reveals a new pathway for modulating two-dimensional materials that enables exploring strongly correlated systems across uncharted parameter space.

关键词： two-dimensional materials 1T-TaSe2 dimensionality crossover metal to Mott insulator transition

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大理岩矿物成分及粒径对力学性质的影响

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岩石力学与工程学报 2024年第S1期43卷 3280-3295页

作者：谢欣玥程毅李松龄陈显辉中国地质大学(武汉)工程学院湖北武汉430074 中铁第四勘察设计院集团有限公司湖北武汉430063

为更好地理解矿物种类与颗粒粒径对岩石力学性质的影响,以4种大理岩为研究对象,首先获得矿物成分、矿物微观力学性质、颗粒粒径及形状等基础数据,接着对它们的强度参数、变形性质及破坏模式进行试验测试,最后进行综合分析。结果表明:(1... 详细信息

为更好地理解矿物种类与颗粒粒径对岩石力学性质的影响,以4种大理岩为研究对象,首先获得矿物成分、矿物微观力学性质、颗粒粒径及形状等基础数据,接着对它们的强度参数、变形性质及破坏模式进行试验测试,最后进行综合分析。结果表明:(1)郴州、房山、Carrara、贺州大理岩强度逐渐减小,延性逐渐增强,即白云石大理岩的强度与脆性都强于方解石大理岩;(2)只考虑颗粒粒径因素时,岩石强度与脆性随着粒径的增加而减小;综合考虑其他因素时,存在粒径大的岩石强度大、脆性强(延性弱)的可能;(3)黏聚力与单轴压缩强度关联性强,二者正向线性相关,黏聚力与抗拉强度关联则较弱;(4)单轴抗压强度与抗拉强度的比值与受压条件下的Griffith理论预测值误差较大,而起裂应力与抗拉强度的比值则稳定在7~12范围;(5)三轴压缩试验中当围压上升至设定围压后,围压在小范围内变化的趋势与轴向应力变化在整体上具有同步性。这些成果不仅加深了对矿物粒径效应的认识、丰富了岩石力学理论知识,也为将来的大理岩工程评估及计算分析提供大量基础数据。

关键词：岩石力学大理岩力学性质矿物粒径矿物成分围压变化

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Harvesting transverse thermoelectricity in topological semimetals

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Science China(Physics,Mechanics & Astronomy) 2020年第3期63卷 120-121页

作者： xianhui chen Department of Physics University of Science and Technology of ChinaHefei 230026China

The thermoelectric effect refers to the phenomenon in which an electric voltage is directly generated from a temperature difference or vice *** two primary such effects are the Seebeck and the Peltier effects discovered in the early nineteenth century[1].These two effects provide the basis for functional thermoelectric devices,and are used to harvest electrical energy from waste heat or as solid-state Peltier cooler,see Figure 1(a).Here,the most challenging issue is to increase the thermoelectric figure of merit zT,which is determined by several interrelated material parameters including the Seebeck coefficient,the electrical and thermal conductivities,as well as the working temperature.

关键词： Seebeck Figure electrical

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Experimental discovery of Weyl semimetal TaAs

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Science China Materials 2015年第9期58卷 675-676页

作者： xianhui chen Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics University of Science and Technology of China Key Laboratory of Strongly-coupled Quantum Matter Physics of Chinese Academy of Sciences University of Science and Technology of China

In 1929,Weyl *** that the massless solution of the Dirac equation represents a pair of a new type of particles,the so-called Weyl fermions[1].However,their existence as a fundamental particle remains evasive after more than eight *** were once considered to be Weyl fermions until its mass was ***,it was proposed that Weyl fermions can be hosted in a class of exotic condensed matter,so called Weyl semimetal(WSM),

关键词： WSM Experimental discovery of Weyl semimetal TaAs Ta ARPES

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氧化三甲胺与心房颤动相关的研究进展

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中华全科医学 2024年第6期22卷 1033-1037,1063页

作者：陈先慧马玉兰青海大学研究生院青海西宁810016 青海省心脑血管病专科医院青海省高原医学科学研究院青海西宁810012

肠道菌群是一个复杂的群落,它与宿主的动态功能相互作用,适当的肠道微生物群结构和代谢物功能对于维持体内平衡至关重要。近些年,大量研究证明肠道菌群及其衍生代谢物影响着心血管疾病的发生发展,其中就包括心律失常,而心房颤动是最常... 详细信息

肠道菌群是一个复杂的群落,它与宿主的动态功能相互作用,适当的肠道微生物群结构和代谢物功能对于维持体内平衡至关重要。近些年,大量研究证明肠道菌群及其衍生代谢物影响着心血管疾病的发生发展,其中就包括心律失常,而心房颤动是最常见的心律失常之一。氧化三甲胺(TMAO)是目前研究最多的肠道菌群衍生代谢物之一,研究发现TMAO与心房颤动的发生发展密切相关。很多流行病学研究表明,TMAO在心房颤动的发生、发展及预后中发挥作用。TMAO通过促进多种心血管危险因素的发生来增加心房颤动易感性。此外,TMAO还可通过激发炎症反应、致使心脏纤维化与心房焦亡来促进心房结构的重构,其水平升高还可增加心房电生理不稳定性,引发异位活动致电生理重构,亦可直接或间接激活自主神经系统引起神经重塑而诱发心房颤动。另外,TMAO水平升高可诱导血小板高反应性,从而促进动脉血栓形成提高心房颤动血栓栓塞发生率,并且与消融术后心房颤动复发也明显相关。研究发现,TMAO在心房颤动防治方面有着一定的潜在价值。在饮食习惯上可以通过减少摄入生成三甲胺的膳食前体从而减少循环中TMAO水平、通过某些药物增加TMAO从肾脏的排泄以及直接服用益生元、益生菌或通过粪便菌群移植的方法调节肠道菌群构成,进而改变肠道菌群衍生代谢物水平。本文根据相关文献的研究结果从上述方面进行综述,以期为今后的相关研究提供一定的理论依据。

关键词：氧化三甲胺心房颤动肠道菌群

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肠道微生物群与自主神经相关心血管疾病的研究进展

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临床心血管病杂志 2024年第6期40卷 502-507页

作者：郭露陈先慧马玉兰青海大学西宁810016 青海大学附属医院心内科

心脏活动受自主神经系统的调节,心脏自主神经系统受交感神经系统和副交感神经系统共同支配,相互平衡,维持着心血管系统的正常生理功能。多项研究表明,肠道微生物群及其代谢物与自主神经系统功能障碍后引起的一系列心血管疾病(冠脉粥样... 详细信息

心脏活动受自主神经系统的调节,心脏自主神经系统受交感神经系统和副交感神经系统共同支配,相互平衡,维持着心血管系统的正常生理功能。多项研究表明,肠道微生物群及其代谢物与自主神经系统功能障碍后引起的一系列心血管疾病(冠脉粥样硬化、房性及室性心律失常、高血压等)密切相关。本文以肠道微生物群及其代谢物对自主神经系统的影响为切入点,以期通过前期干预肠道微生物群及其代谢物来协助治疗自主神经系统功能失衡引起的相关心血管疾病,为预防及治疗心血管疾病开拓新思路。

关键词：肠道微生物群代谢物自主神经系统心血管疾病

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Large eddy simulation on the flow characteristics of an argon thermal plasma jet

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Plasma Science and Technology 2021年第12期23卷 105-116页

作者： Xu ZHOU xianhui chen Taohong YE Minming ZHU School of Engineering Science University of Science and Technology of ChinaHefei 230022People's Republic of China

Large eddy simulations based on the CFD software Open FOAM have been used to study the effect of Reynolds number and turbulence intensity on the flow and mixing characteristics of an argon thermal plasma *** analysis was carried out with respect to four aspects:the average flow field,the instantaneous flow field,turbulence statistical characteristics and the *** was shown that for the argon thermal plasma jet with low Reynolds number,increasing the turbulence intensity will increase the turbulent transport mechanism in the mixing layer rather than in the jet axis,leading to the faster development of *** effect of the turbulent transport mechanism increases with increasing Reynolds ***,the characteristics of flow and mixing are not affected by turbulence intensity for high Reynolds number *** was also found that the mean axial velocity and mean temperature in the axis of the turbulent thermal plasma jet satisfy the self-similarity aspects *** addition,decay constant K is 1.25,which is much smaller than that(5.7-6.1)of the turbulent cold gas jet and has nothing to do with the Reynolds number or turbulence intensity in the jet inlet.

关键词： thermal plasma jet mixing layer characteristics Reynolds number turbulence intensity large eddy simulation

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Recent advances in quasi-2D superconductors via organic molecule intercalation

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Chinese Physics B 2022年第10期31卷 66-73页

作者： Mengzhu Shi Baolei Kang Tao Wu xianhui chen Department of Physics University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Strongly-coupled Quantum Matter Physics University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China

Superconductivity at the 2D limit shows emergent novel quantum phenomena, including anomalously enhanced H_(c2),quantum metallic states and quantum Griffiths singularity, which has attracted much attention in the field of condensed matter physics. In this article, we focus on new advances in quasi-2D superconductors in the bulk phase using an organic molecular electrochemical intercalation method. The enhanced superconductivity and emergent pseudogap behavior in these quasi-2D superconductors are summarized with a further prospect.

关键词： organic molecular intercalation two-dimensional superconductivity organic-inorganic hybrid materials

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远程护理对老年性白内障患者自我效能和生活质量的影响研究

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中外医疗 2024年第11期43卷 180-183页

作者：陈贤慧陈月梅黄长华赖惠敏广东省阳江市人民医院眼科广东阳江529500

目的对老年性白内障患者实施远程护理,研究其对患者生活质量和自我为效能的影响。方法随机选取2021年8月—2023年1月广东省阳江市人民医院治疗的100例老年性白内障术后出院患者为研究对象,按随机数表法分为干预组和对照组,每组50例。两... 详细信息

目的对老年性白内障患者实施远程护理,研究其对患者生活质量和自我为效能的影响。方法随机选取2021年8月—2023年1月广东省阳江市人民医院治疗的100例老年性白内障术后出院患者为研究对象,按随机数表法分为干预组和对照组,每组50例。两组患者均接受常规护理,干预组在此基础上实施远程护理。比较两组干预前后自我效能评分、生活质量评分、护理满意度。结果干预后,干预组一般自我效能感量表评分高于对照组,差异有统计学意义(P<0.05)。两组生活质量量表各维度分值与治疗前相比均升高,且干预组高于对照组,差异有统计学意义(P均<0.05)。干预组护理总满意率为98.00%,高于对照组的82.00%,差异有统计学意义(χ^(2)=7.111,P<0.05)。结论远程护理能有效改善老年性白内障患者的自我效能及生活质量,提升患者满意度。

关键词：老年白内障远程护理自我效能生活质量

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