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Magnetic and electronic properties of bulk and two-dimensional FeBi_(2)Te_(4):A first-principles study
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作者 王倩倩 赵建洲 +4 位作者 吴维康 周胤宁 Qile Li Mark T.Edmonds 杨声远 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第8期450-456,共7页
Layered magnetic materials,such as MnBi_(2)Te_(4),have drawn much attention owing to their potential for realizing twodimensional(2D)magnetism and possible topological states.Recently,FeBi_(2)Te_(4),which is isostruct... Layered magnetic materials,such as MnBi_(2)Te_(4),have drawn much attention owing to their potential for realizing twodimensional(2D)magnetism and possible topological states.Recently,FeBi_(2)Te_(4),which is isostructural to MnBi_(2)Te_(4),has been synthesized in experiments,but its detailed magnetic ordering and band topology have not been clearly understood yet.Here,based on first-principles calculations,we investigate the magnetic and electronic properties of FeBi_(2)Te_(4)in bulk and 2D forms.We show that different from MnBi_(2)Te_(4),the magnetic ground states of bulk,single-layer,and bilayer FeBi_(2)Te_(4)all favor a 120°noncollinear antiferromagnetic ordering,and they are topologically trivial narrow-gap semiconductors.For the bilayer case,we find that a quantum anomalous Hall effect with a unit Chern number is realized in the ferromagnetic state,which may be achieved in experiment by an external magnetic field or by magnetic proximity coupling.Our work clarifies the physical properties of the new material system of FeBi_(2)Te_(4)and reveals it as a potential platform for studying magnetic frustration down to 2D limit as well as quantum anomalous Hall effect. 展开更多
关键词 FeBi_(2)Te_(4) two-dimensional(2D)magnetism noncollinear antiferromagnet quantum anomalous Hall effect first-principles calculation
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Evaluation of transgenic tobacco expressing two insecticidal genes to delay resistance development of Helicoverpa armigera 被引量:3
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作者 jianzhou zhao Yunliu Fan +2 位作者 Xianlin Fan Xiping Shi Meiguang Lu 《Chinese Science Bulletin》 SCIE EI CAS 1999年第20期1871-1874,共4页
The resistance ratio of Helicoverpa armigera to Cry1Ac insecticidal protein from Bacillus thuringiensis (Bt) is 13.1- and 3.02-fold after 18 generations of selection by transgenic tobacco expressing Bt or two (Bt and ... The resistance ratio of Helicoverpa armigera to Cry1Ac insecticidal protein from Bacillus thuringiensis (Bt) is 13.1- and 3.02-fold after 18 generations of selection by transgenic tobacco expressing Bt or two (Bt and CpTI) insecticidal protein genes, in which the average corrected mortality for each selection treatments is about 60% . The mortality of selected population by transgenic Bt gene tobacco is significantly lower than the control strain when fed 展开更多
关键词 TRANSGENIC tobacco Bt CPTI HELICOVERPA ARMIGERA resistance.
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Sorghum Insect Problems and Management 被引量:3
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作者 Chunshan Guo Wei Cui +2 位作者 Xue Feng jianzhou zhao Guihua Lu 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2011年第3期178-192,共15页
Sorghum (Sorghum bicolor) has high levels of starch, sugar, and fiber and is one of the most important energy crops in the world. Insect damage is one of the challenges that impacts sorghum biomass production. There... Sorghum (Sorghum bicolor) has high levels of starch, sugar, and fiber and is one of the most important energy crops in the world. Insect damage is one of the challenges that impacts sorghum biomass production. There are at least 150 insect species that can infest sorghum varieties worldwide. These insects can complete several generations within a growing season, they target various parts of sorghum plants at devel- opmental stages, and they cause significant biomass losses. Genetic research has revealed the existence of resistant genetics in sorghum and insect tolerant sorghum varieties have been identified. Various control methods have been developed, yet more effective management is needed for increasing sorghum biomass production. Although there are no transgenic sorghum products on the market yet, biotechnology has been recognized as an important tool for controlling insect pests and increasing sorghum production. 展开更多
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