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Tuning the Mottness in Sr_(3)Ir_(2)O_(7)via Bridging Oxygen Vacancies

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Chinese Physics Letters 2023年第3期40卷 25-30页

作者：徐妙邹昌炜龚本超贾可叶树森郝镇齐刘凯石友国卢仲毅蔡鹏王亚愚 State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of ChinaBeijing 100872China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Frontier Science Center for Quantum Information Beijing 100084China

The electronic evolution of Mott insulators into exotic correlated phases remains puzzling,because of electron interaction and *** of individual imperfections in Mott insulators could help capture the main mechanism and serve as a basis to understand the *** we utilize scanning tunneling microscopy to probe the atomic scale electronic structure of the spin-orbit-coupling assisted Mott insulator Sr_(3)Ir_(2)O_(7).It is found that the tunneling spectra exhibit a homogeneous Mott gap in defect-free regions,but near the oxygen vacancy in the rotated Ir O_(2)plane the local Mott gap size is significantly *** attribute the enhanced gap to the locally reduced hopping integral between the 5d electrons of neighboring Ir sites via the bridging planar oxygen p *** bridging defects have a dramatic influence on local bandwidth,thus provide a new way to manipulate the strength of Mottness in a Mott insulator.

关键词： bridging tunneling utilize

Magnetic-field modulation of topological electronic state and emergent magneto-transport in a magnetic Weyl semimetal

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The Innovation 2023年第2期4卷 78-82,77页

作者： Jianlei Shen Jiacheng Gao Changjiang Yi Meng Li Shen Zhang Jinying Yang Binbin Wang Min Zhou Rongjin Huang Hongxiang Wei Haitao Yang youguo shi Xiaohong Xu Hong-Jun Gao Baogen Shen Geng Li Zhijun Wang Enke Liu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education&Research Institute of Materials Science Shanxi Normal UniversityTaiyuan 030000China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Ningbo Institute of Materials Technology&Engineering Chinese Academy of SciencesNingboZhejiang 315201China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhouJiangxi 341000China

The modulation of topological electronic state by an external magnetic field is highly desired for condensed-matter *** to achieve this have been proposed theoretically,but few can be realized ***,combining transverse transport,theoretical calculations,and scanning tunneling microscopy/spectroscopy(STM/S)investigations,we provide an observation that the topological electronic state,accompanied by an emergent magneto-transport phenomenon,was modulated by applying magnetic field through induced non-collinear magnetism in the magnetic Weyl semimetal EuB6.A giant unconventional anomalous Hall effect(UAHE)is found during the magnetization re-orientation from easy axes to hard ones in magnetic field,with a UAHE peak around the low field of 5 kOe.

关键词： topological electronic state

Exploration of growth conditions of TaAs Weyl semimetal thin film using pulsed laser deposition

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Chinese Physics B 2023年第4期32卷 582-586页

作者：李世恩林泽丰胡卫闫大禹陈赋聪柏欣博朱北沂袁洁石友国金魁翁红明郭海中 Key Laboratory of Materials Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

Ta As,the first experimentally discovered Weyl semimetal material,has attracted a lot of attention due to its high carrier mobility,high anisotropy,nonmagnetic properties and strong interaction with *** make it an ideal candidate for the study of Weyl fermions and applications in quantum computation,thermoelectric devices,and *** further basic physics studies and potential applications,large-size and high-quality Ta As films are urgently ***,it is difficult to grow As-stoichiometry Ta As films due to the volatilization of As during the *** solve this problem,we attempted to grow Ta As films on different substrates using targets with different As stoichiometric ratios via pulsed laser deposition(PLD).In this work,we found that partial As ions of the Ga As substrate are likely to diffuse into the Ta As films during growth,which was preliminarily confirmed by structural characterization,surface topography and composition *** a result,the As content in the Ta As film was improved and the Ta As phase was *** work presents an effective method for the fabrication of Ta As films using PLD,enabling possible use of the Weyl semimetal film for functional devices.

关键词： Weyl semimetal Ta As film pulsed laser deposition

Electronic structure, Dirac points and Fermi arc surface states in three-dimensional Dirac semimetal Na_3Bi from angle-resolved photoemission spectroscopy

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Chinese Physics B 2016年第7期25卷 76-88页

作者：梁爱基陈朝宇王志俊石友国冯娅伊合绵谢卓晋何少龙何俊峰彭莹莹刘艳刘德发胡成赵林刘国东董晓莉张君 M Nakatake H Iwasawa K shimad M Arita H Namatame M Taniguchi 许祖彦陈创天翁红明戴希方忠周兴江 Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Hiroshima Synchrotron Radiation Center Hiroshima University 2-313 Kagamiyama Higashi-Hiroshima City 739-0046 Japan Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China Collaborative Innovation Center of Quantum Matter Beijing China

The three-dimensional（3D） Dirac semimetals have linearly dispersive 3D Dirac nodes where the conduction band and valence band are connected. They have isolated 3D Dirac nodes in the whole Brillouin zone and can be viewed as a 3D counterpart of graphene. Recent theoretical calculations and experimental results indicate that the 3D Dirac semimetal state can be realized in a simple stoichiometric compound A3Bi（A = Na, K, Rb）. Here we report comprehensive high-resolution angle-resolved photoemission（ARPES） measurements on the two cleaved surfaces,（001） and（100）, of Na3Bi. On the（001） surface, by comparison with theoretical calculations, we provide a proper assignment of the observed bands, and in particular, pinpoint the band that is responsible for the formation of the three-dimensional Dirac cones. We observe clear evidence of 3D Dirac cones in the three-dimensional momentum space by directly measuring on the kx–ky plane and by varying the photon energy to get access to different out-of-plane kzs. In addition, we reveal new features around the Brillouin zone corners that may be related with surface reconstruction. On the（100） surface, our ARPES measurements over a large momentum space raise an issue on the selection of the basic Brillouin zone in the（100） plane. We directly observe two isolated 3D Dirac nodes on the（100） surface. We observe the signature of the Fermi-arc surface states connecting the two 3D Dirac nodes that extend to a binding energy of ~150 me V before merging into the bulk band. Our observations constitute strong evidence on the existence of the Dirac semimetal state in Na3Bi that are consistent with previous theoretical and experimental work. In addition, our results provide new information to clarify on the nature of the band that forms the3 D Dirac cones, on the possible formation of surface reconstruction of the（001） surface, and on the issue of basic Brillouin zone selection for the（100） surface.

关键词： Dirac semimetal Na3Bi photonemission surface state

5种杀虫剂对西花蓟马的室内毒力及其对巴氏新小绥螨的安全性评价

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云南农业大学学报（自然科学版） 2024年第4期39卷 23-28页

作者：陈平刘正玲杨亚辉李凡詹莜国史爱民谢永辉兰平秀云南农业大学植物保护学院云南昆明650201 云南省烟草公司昆明市公司云南昆明650021 云南推动者生物科技有限公司云南昆明650201

【目的】筛选对西花蓟马(Frankliniella occidentalis)防控效果显著且对巴氏新小绥螨(Neoseiulus barkeri)安全的杀虫剂,为联合使用杀虫剂和捕食螨防控西花蓟马提供参考。【方法】分别使用60 g/L乙基多杀菌素悬浮剂、苦参碱、25%噻虫嗪... 详细信息

【目的】筛选对西花蓟马(Frankliniella occidentalis)防控效果显著且对巴氏新小绥螨(Neoseiulus barkeri)安全的杀虫剂,为联合使用杀虫剂和捕食螨防控西花蓟马提供参考。【方法】分别使用60 g/L乙基多杀菌素悬浮剂、苦参碱、25%噻虫嗪水分散粒剂、5%阿维菌素和70%吡虫啉共5种常用杀虫剂浸渍过的菜豆豆荚饲喂西花蓟马,48 h后测定其对西花蓟马成虫的防控效果;将巴氏新小绥螨放入喷洒过药剂的捕食螨饲养麦麸中,48 h后测定其对巴氏新小绥螨的安全性。【结果】这5种杀虫剂对西花蓟马的虫口减退率分别为97.78%、95.00%、92.22%、88.89%和59.56%,防控效果依次为97.52%、94.43%、91.34%、87.43%和55.42%,乙基多杀菌素、苦参碱和噻虫嗪对西花蓟马的防控效果较好。与清水对照组相比,苦参碱、噻虫嗪、乙基多杀菌素、吡虫啉和阿维菌素对巴氏新小绥螨的虫口减退率分别为11.37%、9.71%、9.15%、8.04%和4.70%,其中,阿维菌素对巴氏新小绥螨虫口数量的影响最小,安全性最高。【结论】单独使用时,乙基多杀菌素、苦参碱和噻虫嗪可作为生产中防控西花蓟马的推荐药剂;与天敌组合使用时,阿维菌素与巴氏新小绥螨联合使用能够充分发挥杀虫剂的药效和捕食螨的捕食作用,乙基多杀菌素和噻虫嗪则应在捕食螨充分定殖后使用。

关键词：西花蓟马杀虫剂巴氏新小绥螨防治效果安全性评价

替代寄主米蛾卵驯化对夜蛾黑卵蜂相关生物学参数的影响

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植物保护学报 2024年第3期51卷 578-584页

作者：李维薇王德海刘正玲李伟宁德凯罗嵘詹莜国史爱民王春娅谢永辉中国科学院昆明动物研究所云南省城市生物多样性国际研发中心云南省西南及跨境生物多样性重点实验室昆明650223 云南农业大学植物保护学院昆明650201 云南省植保植检站昆明650034 云南省烟草公司昆明市公司昆明650300 云南推动者生物科技有限公司昆明650117

为评估替代寄主米蛾Corcyra cephalonica卵能否用于驯化天敌夜蛾黑卵蜂Telenomus remus及其驯化效果,通过分析不同驯化代数夜蛾黑卵蜂对米蛾卵的寄生效果,比较用米蛾卵驯化的F30代夜蛾黑卵蜂品系和用斜纹夜蛾Spodoptera litura卵驯化的... 详细信息

为评估替代寄主米蛾Corcyra cephalonica卵能否用于驯化天敌夜蛾黑卵蜂Telenomus remus及其驯化效果,通过分析不同驯化代数夜蛾黑卵蜂对米蛾卵的寄生效果,比较用米蛾卵驯化的F30代夜蛾黑卵蜂品系和用斜纹夜蛾Spodoptera litura卵驯化的夜蛾黑卵蜂品系的发育历期、寿命和寄生效果等生物学参数的差异。结果显示,用米蛾卵驯化的F1、F10和F30代夜蛾黑卵蜂对米蛾卵的寄生率分别为1.94%、16.14%和85.00%,子代蜂羽化率分别为4.76%、30.28%和85.72%,随着米蛾卵驯化代数增长,夜蛾黑卵蜂的寄生率和子代蜂羽化率均显著增加。用米蛾卵驯化的F30代夜蛾黑卵蜂品系的发育历期和雌成蜂寿命分别为12.67 d和6.92 d,前者显著长于用斜纹夜蛾驯化的夜蛾黑卵蜂品系,后者与用斜纹夜蛾驯化的夜蛾黑卵蜂品系无显著差异。用米蛾卵驯化的F30代夜蛾黑卵蜂品系和用斜纹夜蛾驯化的夜蛾黑卵蜂品系对斜纹夜蛾的寄生率分别为98.63%和99.04%,子代蜂羽化率分别为84.33%和80.81%,2个品系之间均无显著差异。表明米蛾卵是夜蛾黑卵蜂扩繁的优良替代寄主,在夜蛾黑卵蜂商品化应用及生物防治夜蛾科害虫方面有巨大潜力。

关键词：夜蛾黑卵蜂米蛾卵斜纹夜蛾驯化生物防治替代寄主

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大麦新品种蒙啤麦3号肥料与密度效应研究

北方农业学报 2016年第6期44卷 1-4页

作者：张凤英包海柱史有国吕二锁刘志萍徐光祥内蒙古农牧业科学院内蒙古呼和浩特010031 内蒙古农业大学农学院内蒙古呼和浩特010018 巴彦淖尔市农牧业科学院内蒙古陕坝015000

为明确蒙啤麦3号大麦在内蒙古河套灌区的产量、籽粒蛋白质含量对施肥水平及密度的响应,采用正交试验设计,开展了N、P、K及密度的4因素4水平栽培研究。结果表明:在适期播种的前提下,蒙啤麦3号在内蒙古河套灌区的生产潜力可达626.1 kg/667... 详细信息

为明确蒙啤麦3号大麦在内蒙古河套灌区的产量、籽粒蛋白质含量对施肥水平及密度的响应,采用正交试验设计,开展了N、P、K及密度的4因素4水平栽培研究。结果表明:在适期播种的前提下,蒙啤麦3号在内蒙古河套灌区的生产潜力可达626.1 kg/667m^2,与此相适宜的施肥水平和种植密度为纯氮10.24 kg/667m^2、纯磷9.74 kg/667m^2、纯钾8.4 kg/667m^2,密度31.2万株/667m^2;籽粒千粒重及蛋白质含量符合GB/T7416-2008对多棱啤酒大麦品质的要求。

关键词：蒙啤麦3号密度肥料产量蛋白质含量

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内蒙古罗布麻种子形态观察和发芽试验研究

内蒙古农业科技 2015年第3期43卷 12-15页

作者：张悦刘燕陈立宇史有国张旭贺志英刘哲懿刘建国巴彦淖尔市农牧业科学研究院内蒙古临河015000 内蒙古农牧业科学研究院内蒙古呼和浩特010030

以罗布麻种子为试验材料,对其进行形态特征观测;同时研究不同抑菌处理、不同光照条件和不同浸种时间对种子萌发的影响。结果表明:罗布麻种子呈卵圆状矩圆形,黄褐色,表面具细条纹,顶端有白色绢质毛,种长为2.437 mm、种宽为0.681 mm、种... 详细信息

以罗布麻种子为试验材料,对其进行形态特征观测;同时研究不同抑菌处理、不同光照条件和不同浸种时间对种子萌发的影响。结果表明:罗布麻种子呈卵圆状矩圆形,黄褐色,表面具细条纹,顶端有白色绢质毛,种长为2.437 mm、种宽为0.681 mm、种皮厚度0.015 mm、种子大小指数为0.025。无菌水处理下发芽率发芽势均为最高,作为抑菌试剂较为适宜;光照条件对罗布麻种子发芽率发芽势的影响不显著,相较之下,罗布麻种子适宜在自然光条件下发芽。种子发芽率和发芽势在8 h时最高,发芽时间最短,种子浸种处理以8 h为宜。

关键词：罗布麻种子形态萌发

球孢白僵菌和爪哇虫草菌对烟草青枯病的防治效果

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微生物学通报 2024年第8期51卷 2974-2985页

作者：施春兰吴国星赵长飞杨燕通万丽娜田永明刘正玲谢永辉詹莜国顾小飞云南农业大学植物保护学院云南昆明650201 云南省烟草公司昆明市公司云南昆明650051

【背景】烟草青枯病是青枯劳尔氏菌(Ralstonia solanacearum,简称青枯菌)引起的土传病害,给烟草生产带来了极大的损失。【目的】探究实验室2株生防菌株球孢白僵菌(Beauveria bassiana)HZXJ和爪哇虫草菌(Cordyceps javanica)Bd01对青枯... 详细信息

【背景】烟草青枯病是青枯劳尔氏菌(Ralstonia solanacearum,简称青枯菌)引起的土传病害,给烟草生产带来了极大的损失。【目的】探究实验室2株生防菌株球孢白僵菌(Beauveria bassiana)HZXJ和爪哇虫草菌(Cordyceps javanica)Bd01对青枯菌的抑制作用及防效。【方法】采用平板对峙、琼脂扩散法及生长曲线法测定2株生防菌株及其发酵液对青枯菌生长的抑制作用;通过室内盆栽试验及大田试验测定菌株HZXJ与Bd011×10^(8)孢子/mL悬浮液对烟草青枯病的防治效果。【结果】平板对峙试验发现,菌株HZXJ与Bd01发酵液在10 d时对青枯菌的抑制率分别为51.28%和47.59%。菌株HZXJ与Bd01的灭菌发酵上清液对青枯菌10 d时的平板抑制率分别为62.54%和35.49%。根据生防菌与病原菌OD600绘制的生长曲线也表明菌株HZXJ与Bd01的无菌发酵上清液对青枯菌均有抑制作用。盆栽试验结果表明,菌株HZXJ与Bd011×10^(8)孢子/mL悬浮液处理后15 d对烟草青枯病防效分别为43.33%和19.99%,52%氯尿硫酸铜可溶性粉剂800倍液的防效为39.99%;菌株HZXJ与Bd01处理后30 d对烟草青枯病的防效分别为43.75%和21.87%,52%氯尿硫酸铜可溶性粉剂800倍液的防效为46.90%。大田试验结果表明,菌株HZXJ与Bd011×10^(8)孢子/mL悬浮液处理后15 d对烟草青枯病的防效分别为80.00%和35.00%,52%氯尿硫酸铜可溶性粉剂800倍液的防效为40.00%;菌株HZXJ与Bd01处理后30 d对烟草青枯病的防效分别为52.63%和63.16%,52%氯尿硫酸铜可溶性粉剂800倍液的防效为53.98%。【结论】菌株HZXJ和Bd01对青枯菌有显著抑制效果。结合盆栽试验和大田试验可以证明菌株HZXJ和Bd01有作为烟草青枯病生防菌的潜力。

关键词：烟草青枯病青枯劳尔氏菌球孢白僵菌爪哇虫草菌生物防效