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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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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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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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Kagome superconductors AV3Sb5(A = K, Rb, Cs)

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National Science Review 2023年第2期10卷 260-275页

作者： Kun Jiang Tao Wu Jia-Xin Yin Zhenyu Wang M.Zahid Hasan Stephen D.Wilson xianhui chen Jiangping Hu Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China CAS Key Laboratory of Strongly-coupled Quantum Matter Physics Department of Physics University of Science and Technology of China Laboratory for Quantum Emergence Department of PhysicsSouthern University of Science and Technology Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7) Department of PhysicsPrinceton University Materials Department and California Nanosystems Institute University of California Santa Barbara Kavli Institute of Theoretical Sciences University of Chinese Academy of Sciences

The quasi-two-dimensional kagome materials AV3Sb5(A=K,Rb,Cs) were found to be a prime example of kagome superconductors,a new quantum platform to investigate the interplay between electron correlation effects,topology and geometric *** this review,we report recent progress on the experimental and theoretical studies of AV3Sb5and provide a broad picture of this fast-developing field in order to stimulate an expanded search for unconventional kagome *** review the electronic properties of AV3Sb5,the experimental measurements of the charge density wave state,evidence of time-reversal symmetry breaking and other potential hidden symmetry breaking in these materials.A variety of theoretical proposals and models that address the nature of the time-reversal symmetry breaking are ***,we review the superconducting properties of AV3Sb5,especially the potential pairing symmetries and the interplay between superconductivity and the charge density wave state.

关键词： kagome superconductor charge density wave time-reversal symmetry breaking topological metal

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Performance and mechanism of CO_(2) absorption during the simultaneous removal of SO_(2) and NO_(x) by wet scrubbing process

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Journal of Environmental Sciences 2024年第1期135卷 534-545页

作者： Peng Lu xianhui Yan Lyumeng Ye Dingsheng chen Dongyao chen Jianhang Huang Chaoping Cen Guangdong Province Engineering Laboratory for Air Pollution Control South China Institute of Environmental SciencesMinistry of Ecology and EnvironmentGuangzhou 510655China Guangdong Provincial Key Laboratory of Water and Air Pollution Control Guangzhou 510655China School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China

The co-removal of CO_(2)while removing SO_(2)and NOxfrom industrial flue gas has great potential of carbon emission reduction but related research is *** this study,a wet scrubbing process with various urea solutions for desulfurization and denitrification was explored for the possibility of CO_(2)*** results showed that the urea-additive solutions were efficient for NOxand SO_(2)abatement,but delivered<10%CO_(2)absorption *** addition of Ca(OH)_(2)dramatically enhanced the CO_(2)absorption,remained the desulfurization efficiency,unfortunately restricted the denitrification *** various operating parameters,pH of solution played a determining role during the *** contradictory pH demands of CO_(2)absorption and denitrification were observed and discussed in detail.A higher pH of solution than 10 was favorable for CO_(2)absorption,while the oxidizing of NO to NO_(2),NO_(2)^(-)or NO_(3)^(-)by NaClO_(2)was inhibited in this ***7

关键词： CO_(2)absorption Synergistic desulfurization and denitrification Wet scrubbing process Urea-NaClO_(2)-Ca(OH)_(2)absorbent Carbonation reaction

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Core–Shell Microfiber Encapsulation Enables Glycerol‑Free Cryopreservation of RBCs with High Hematocrit

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Nano-Micro Letters 2024年第1期16卷 35-54页

作者： xianhui Qin Zhongrong chen Lingxiao Shen Huilan Liu Xilin Ouyang Gang Zhao Department of Electronic Engineering and Information Science University of Science and Technology of ChinaHefei 230027People’s Republic of China School of Biomedical Engineering Anhui Medical UniversityHefei 230022People’s Republic of China Department of Blood Transfusion The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001People’s Republic of China The Fourth Medical Center Chinese PLA General HospitalBeijing 100089People’s Republic of China

Cryopreservation of red blood cells(RBCs)provides great potential benefits for providing transfusion timely in *** concentrations of glycerol(20%or 40%)are used for RBC cryopreservation in current clinical practice,which results in cytotoxicity and osmotic injuries that must be carefully ***,existing studies on the low-glycerol cryopreservation of RBCs still suffer from the bottleneck of low hematocrit levels,which require relatively large storage space and an extra concentration process before transfusion,making it inconvenient(time-consuming,and also may cause injury and sample lose)for clinical *** this end,we develop a novel method for the glycerol-free cryopreservation of human RBCs with a high final hematocrit by using trehalose as the sole cryoprotectant to dehydrate RBCs and using core–shell alginate hydrogel microfibers to enhance heat transfer during *** from previous studies,we achieve the cryopreservation of human RBCs at high hematocrit(>40%)with high recovery(up to 95%).Additionally,the washed RBCs post-cryopreserved are proved to maintain their morphology,mechanics,and functional *** may provide a nontoxic,high-efficiency,and glycerol-free approach for RBC cryopreservation,along with potential clinical transfusion benefits.

关键词： Cryopreservation Human red blood cells Core-shell microfibers Trehalose Hematocrit

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Manipulating high-temperature superconductivity by oxygen doping in Bi2Sr2CaCu2O8+δ thin flakes

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National Science Review 2022年第10期9卷 112-119页

作者： Bin Lei Donghui Ma Shihao Liu Zeliang Sun Mengzhu Shi Weizhuang Zhuo Fanghang Yu Genda Gu Zhenyu Wang xianhui chen Key Laboratory of Strongly-Coupled Quantum Matter Physics Chinese Academy of Sciences and Department of Physics University of Science and Technology of China CAS Center for Excellence in Quantum Information and Quantum Physics Department of Condensed Matter Physics and Materials Science Brookhaven National Laboratory CAS Center for Excellence in Superconducting Electronics (CENSE) Collaborative Innovation Center of Advanced Microstructures Nanjing University

Harnessing the fascinating properties of correlated oxides requires precise control of their carrier *** to other methods,oxygen doping provides an effective and more direct way to tune the electronic properties of correlated *** several approaches,such as thermal annealing and oxygen migration,have been introduced to change the oxygen content,a continuous and reversible solution that can be integrated with modern electronic technology is much in ***,we report a novel ionic field-effect transistor using solid Gd-doped CeO2as the gate dielectric,which shows a remarkable carrier-density-tuning ability via electric-field-controlled oxygen concentration at room *** Bi2Sr2CaCu2O8+δ(Bi-2212) thin flakes,we achieve a reversible superconductor-insulator transition by driving oxygen ions in and out of the samples with electric fields,and map out the phase diagram all the way from the insulating regime to the over-doped superconducting regime by continuously changing the oxygen doping *** analysis indicates that the reversible superconductor-insulator transition for the Bi-2212 thin flakes follows the theoretical description of a two-dimensional quantum phase *** work provides a route for realizing electric-field control of phase transition in correlated ***,the configuration of this type of transistor makes heterostructure/interface engineering possible,thus having the potential to serve as the next-generation all-solid-state field-effect transistor.

关键词： high-temperature superconductivity oxygen doping electric field effect all-solid-state field effect transistor superconductor–insulator transition

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