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Persistence of charge density wave against variation of band structures in V_(x)Ti_(1−x)Se_(2)(x=0–0.1)

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Nano Research 2024年第3期17卷 2129-2135页

作者： Zhanfeng Liu Tongrui Li Wen zhu Hongwei Shou Mukhtar Lawan Adam Qilong Cui Yuliang Li Sheng Wang Yunbo Wu hongen zhu Yi Liu Shuangming Chen Xiaojun Wu Shengtao Cui Li Song Zhe Sun National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230029China CAS Key Laboratory of Strongly-coupled Quantum Matter Physics University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China School of Chemistry and Materials Sciences CAS Key Laboratory of Materials for Energy Conversionand CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China School Zhejiang Institute of Photonelectronics Jinhua 321004China

Charge density wave(CDW)is a phenomenon that occurs in materials,accompanied by changes in their intrinsic electronic *** study of CDW and its modulation in materials holds tremendous significance in materials research,as it provides a unique approach to controlling the electronic properties of ***_(2) is a typical layered material with a CDW phase at low *** V substitution for Ti in TiSe_(2),we tuned the carrier concentration in V_(x)Ti_(1-x)Se_(2) to study how its electronic structures ***-resolved photoemission spectroscopy(ARPES)shows that the band-folding effect is sustained with the doping level up to 10%,indicating the persistence of the CDW phase,even though the band structure is strikingly different from that of the parent compound TiSe_(2).Though CDW can induce the band fold effect with a driving force from the perspective of electronic systems,our studies suggest that this behavior could be maintained by lattice distortion of the CDW phase,even if band structures deviate from the electron-driven CDW *** work provides a constraint for understanding the CDW mechanism in TiSe_(2),and highlights the role of lattice distortion in the band-folding effect.

关键词： charge density wave band structure lattice distortion

A non-rigid shift of band dispersions induced by Cu intercalation in 2H-TaSe2

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Nano Research 2020年第2期13卷 353-357页

作者： Pengdong Wang Rashid Khan Zhanfeng Liu Bo Zhang Yuliang Li Sheng Wang Yunbo Wu hongen zhu Yi Liu Guobin Zhang Dayong Liu Shuangming Chen Li Song Zhe Sun National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesP.0.Box 1129Hefei 230031China Key Laboratory of Strongly-coupled Quantum Matter Physics Chinese Academy of SciencesUniversity of Science and Technology of ChinaHefei 230026China CAS Centerfor Excellence in Superconducting Electronics(CENSE) Shanghai 200050China

The intercalation of metal is a promising method for the modulating electronic properties in transition metal dichalcogenides(TMDs).However,there still lacks enough knowledge about how the intercalated atoms directly impact the two-dimensional structural layers and modulate the band structures *** advantage of X-ray absorption fine structure and angle-resolved photoemission spectroscopy,we studied how Cu intercalation influences the host TaSe2 layers in Cu0.03TaSe2 *** intercalated Cu atoms form bonds with Se of the host layers,and there is charge transfer from Cu to *** examining the changes of band dispersions,we show that the variation of electronic structures is beyond a simple rigid band model with merely charge doping *** work'reveals that the unusual change of band dispersions is associated with the formation of bonds between the intercalated metal elements and anion ions in the host layers,and provides a reference for the comprehensive understanding of the electronic structures in intercalated materials.

关键词： transition metal dichalcogenides Cu-intercalation band shift angle resolved photoemission spectroscopy

Experimental Observation of Electronic Structures of Kagome Metal YCr6Ge6

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Chinese Physics Letters 2020年第8期37卷 78-82页

作者： Pengdong Wang Yihao Wang Bo Zhang Yuliang Li Sheng Wang Yunbo Wu hongen zhu Yi Liu Guobin Zhang Dayong Liu Yimin Xiong Sun Zhe National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China Key Laboratory of Strongly Coupled Quantum Matter Physics Chinese Academy of SciencesUniversity of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China

Using angle-resolved photoemission spectroscopy,we study electronic structures of a Kagome metal *** dispersions along kz direction are significant,suggesting a remarkable interlayer coupling between neighboring Kagome *** ARPES data with first-principles calculations,we find a moderate electron correlation in this material,since band calculations must be compressed in the energy scale to reach an excellent agreement between experimental data and theoretical ***,as indicated by band calculations,there is a flat band in the vicinity of the Fermi level at the Г–M–K plane in the momentum space,which could be responsible for the unusual transport behavior in YCr6Ge6.

关键词： neighboring momentum Fermi

Disentangling the electron-lattice dichotomy of the excitonic insulating phase in Ta_(2)Ni(Se_(1-x)S_(x))_(5) with sulfur substitution and potassium deposition

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Science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 119-126页

作者： Tongrui Li Yang Liu hongen zhu Haiping Chen Zhanfeng Liu Zhengming Shang Yuliang Li Hui Tian Yunbo Wu Yuhao Hong Haihua Luo Yi Liu Guobin Zhang Lidong Zhang Yuqiao Guo Changzheng Wu Li Song Shengtao Cui Zhe Sun National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei230029China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei230026China School of Mechanics and Optoelectronic Physics Anhui University of Science and TechnologyHuainan232001China CAS Key Laboratory of Strongly-coupled Quantum Matter Physics University of Science and Technology of ChinaHefei230026China Collaborative Innovation Center of Advanced Microstructures Nanjing210093China

Ta_(2)NiSe_(5) is a promising candidate for hosting an excitonic insulator(EI)phase,a novel electronic state driven by electron-hole Coulomb ***,the role of electron-lattice coupling in the formation of the EI phase remains ***,we use angle-resolved photoemission spectroscopy(ARPES)to study the band structure evolution of Ta_(2)Ni(Se_(1-x)S_(x))_(5) with sulfur substitution and potassium deposition,which modulate the band gap and the carrier concentration,*** find that the Ta 5d states originating from the bottom of the conduction band persist at the top of the valence band in the low-temperature monoclinic phase,indicating the importance of exciton condensation in opening the gap in the semi-metallic band *** also observe that the characteristic overlap between the conduction and valence bands can be restored in the monoclinic lattice by mild carrier injection,suggesting that the lattice distortion in the monoclinic phase is not the main factor for producing the insulating gap,but rather the exciton condensation in the electronic system is the dominant driving *** results shed light on the electron-lattice decoupling and the origin of the EI phase in Ta_(2)Ni(Se_(1-x)Sx)_(5).

关键词： excitonic insulator angle-resolved photoemission spectroscopy sulfur substitution potassium deposition

Tailoring of Bandgap and Spin-Orbit Splitting in ZrSe_(2) with Low Substitution of Ti for Zr

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Chinese Physics Letters 2022年第7期39卷 69-73页

作者： Sheng Wang Zia ur Rehman Zhanfeng Liu Tongrui Li Yuliang Li Yunbo Wu hongen zhu Shengtao Cui Yi Liu Guobin Zhang Li Song Zhe Sun National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Nanoscale Synthesis&Research Laboratory Department of Applied PhysicsUniversity of KarachiKarachi-75270Pakistan

Tuning the bandgap in layered transition metal dichalcogenides(TMDCs) is crucial for their versatile applications in many fields. The ternary formation is a viable method to tune the bandgap as well as other intrinsic properties of TMDCs, because the multi-elemental characteristics provide additional tunability at the atomic level and advantageously alter the physical properties of TMDCs. Herein, ternary Ti_(x)Zr_(1-x)Se_(2) single crystals were synthesized using the chemical-vapor-transport method. The changes in electronic structures of ZrSe_(2) induced by Ti substitution were revealed using angle-resolved photoemission spectroscopy. Our data show that at a low level of Ti substitution, the bandgap of Ti_(x)Zr_(1-x)Se_(2) decreases monotonically, and the electronic system undergoes a transition from a semiconducting to a metallic state without a significant variation of dispersions of valence bands. Meanwhile, the size of spin-orbit splitting dominated by Se 4p orbitals decreases with the increase of Ti doping. Our work shows a convenient way to alter the bandgap and spin-orbit coupling in TMDCs at the low level of substitution of transition metals.

关键词： red Tailoring of Bandgap and Spin-Orbit Splitting in ZrSe_(2)with Low Substitution of Ti for Zr

Electronic Instability of Kagome Metal CsV_(3)Sb_(5) in the 2×2×2 Charge Density Wave State

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Chinese Physics Letters 2023年第4期40卷 56-61页

作者：朱红恩李彤瑞喻芳航李昱良王盛吴云波刘站锋尚政明崔胜涛刘毅张国斌张李东王震宇吴涛应剑俊陈仙辉孙喆 National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Department of Physics CAS Key Laboratory of Strongly-coupled Quantum Matter PhysicsUniversity of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics Hefei 230026China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China

Recently discovered kagome metals AV_(3)Sb_(5)(A=K,Rb,and Cs)provide an ideal platform to study the correlation among nontrivial band topology,unconventional charge density wave(CDW),and *** evolution of electronic structures associated with the change of lattice modulations is crucial for understanding of the CDW mechanism,with the combination of angle-resolved photoemission spectroscopy(ARPES)measurements and density functional theory calculations,we investigate how band dispersions change with the increase of lattice *** particular,we focus on the electronic states around M point,where the van Hove singularities are expected to play crucial roles in the CDW *** ARPES studies reported a spectral weight splitting of the van Hove singularity around M point,which is associated with the 3D lattice *** studies reveal that this“splitting”can be connected to the two van Hove singularities at k_(z)=0 and k_(z)=π/c in the normal *** the electronic system enters into the CDW state,both van Hove singularities move *** novel properties are important for understanding of the CDW transition.

关键词： transition splitting lattice

抵当通窍活血汤治疗穿支动脉粥样硬化型梗死临床观察

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中医药通报 2024年第4期23卷 56-59页

作者：王文徐世克朱红恩万丰娟河南省镇平县中医院河南镇平474250

目的:探讨抵当通窍活血汤治疗穿支动脉粥样硬化型梗死的临床效果。方法:选取穿支动脉粥样硬化型梗死患者124例,随机分为观察组62例与对照组62例,对照组给予西医抗血小板聚集、降脂等常规治疗,观察组在对照组基础上给予抵当通窍活血汤治... 详细信息

目的:探讨抵当通窍活血汤治疗穿支动脉粥样硬化型梗死的临床效果。方法:选取穿支动脉粥样硬化型梗死患者124例,随机分为观察组62例与对照组62例,对照组给予西医抗血小板聚集、降脂等常规治疗,观察组在对照组基础上给予抵当通窍活血汤治疗,观察两组的临床疗效及治疗前后中医证候积分、血小板活性指标(血小板活化率、血小板黏附率)、血液流变学指标[血浆黏度(PV)、低切全血黏度(L-WBV)、中切全血黏度(M-WBV)、高切全血黏度(H-WBV)]、神经相关因子[脑源性神经营养因子(BDNF)、神经生长因子(NGF)、神经元特异性烯醇化酶(NSE)]。结果:观察组治疗后总有效率为87.10%,高于对照组的75.81%,差异有统计学意义(P<0.05);治疗后两组中医证候积分、血小板活化率、黏附率、血液流变学指标及血清NSE水平均显著降低,且观察组低于对照组,差异有统计学意义(P<0.05);治疗后两组血清BDNF、NGF水平均有升高,且观察组高于对照组,差异有统计学意义(P<0.05)。结论:抵当通窍活血汤可改善穿支动脉粥样硬化型梗死患者临床症状,降低血小板活化率及血小板黏附率,降低血液高凝状态,提高脑源性神经营养因子水平,促进损伤神经细胞的修复。

关键词：抵当通窍活血汤穿支动脉粥样硬化型梗死血小板活性临床观察

Recent advances on controllable and selective catalytic oxidation of cyclohexene

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Chinese Journal of Catalysis 2018年第5期39卷 899-907页

作者： hongen Cao Boran zhu Yufan Yang Lin Xu Lei Yu Qing Xu School of Chemistry and Chemical Engineering and the Institute of Pesticide of School of Horticulture and Plant Protection Yangzhou UniversityYangzhou 225009JiangsuChina Jiangsu Yangnong Chemical Group Co.Ltd. Yangzhou 225009JiangsuChina

Because of multiple potential reaction sites and variable oxidation depths,oxidation of cyclohexene can lead to a mixture of products with different oxidation states and functional groups,such as 7-oxabicyclo[4.1.0]heptane,trans/cis-cyclohexane-1,2-diol,cyclohex-2-en-1-ol,cyclohex-2-en-1-one,and even adipic *** products are broadly and abundantly used intermediates in the chemical industry;therefore,controllable oxidation reactions for cyclohexene that can selectively afford the targeted products are synthetically valuable for applications in both the academy and industry,thus becoming the aim of synthetic and catalytic chemists in the *** reports on selective oxidation of cyclohexene have recently appeared in the literature because of its *** short review summarizes the recent advances on this subject,and the contents are mainly classified based on the chosen *** hope that this review can provide a useful guide for controllable and selective catalytic oxidation of cyclohexene for interested readers from both the academy and industry.

关键词： Cyclohexene Selective oxidation Green chemistry 7-Oxabicyclo[4.1.0]heptane Cyclohexane-1,2-diol Adipic acid Cyclohex-2-en-1-ol Cyclohex-2-en-1-one

1957—2017年中国不同流域土石坝溃坝事件时空演化规律

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水科学进展 2024年第5期35卷 689-699页

作者：周宁王芳李铮张铸李宏恩南京水利科学研究院水灾害防御全国重点实验室江苏南京210029

本研究旨在分析中国不同流域土石坝溃坝事件与厄尔尼诺现象之间的关联性,并探讨厄尔尼诺对水库大坝安全运行的潜在影响。基于1957—2017年中国气象站点逐日降水数据,采用合成分析和交叉小波方法,分析不同流域内厄尔尼诺对极端降水时空... 详细信息

本研究旨在分析中国不同流域土石坝溃坝事件与厄尔尼诺现象之间的关联性,并探讨厄尔尼诺对水库大坝安全运行的潜在影响。基于1957—2017年中国气象站点逐日降水数据,采用合成分析和交叉小波方法,分析不同流域内厄尔尼诺对极端降水时空分布特征的影响,进而建立土石坝溃坝事件与厄尔尼诺现象之间的相关性。结果表明:九大流域内溃坝事件与厄尔尼诺显著相关,其中海河流域内溃坝事件与厄尔尼诺当年关联性更强,而黄河、长江和东南诸河流域的溃坝事件则更多地受到厄尔尼诺次年的影响;在相关性方面,黄河、长江及海河流域的强降水指数与厄尔尼诺指数之间显著负相关,且厄尔尼诺指数的变化通常超前于强降水事件约1a。

关键词：溃坝事件时空演化极端降水九大流域厄尔尼诺