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您的检索式：作者名="Kenan Deng"
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| 1 | Crossover from 2D metal to 3D Dirac semimetal in metallic PtTe2 films with local Rashba effect显示文摘PtTe2 and PtSe2 with trigonal structure have attracted extensive research interests since the discovery of type-II Dirac fermions in the bulk crystals. The evolution of the electronic structure from bulk 3D topological semimetal to 2D atomic thin films is an important scientific question. While a transition from 3D type-II Dirac semimetal in the bulk to 2D semiconductor in monolayer(ML) film has been reported for PtSe2, so far the evolution of electronic structure of atomically thin PtTe2 films still remains unexplored.Here we report a systematic angle-resolved photoemission spectroscopy(ARPES) study of the electronic structure of high quality PtTe2 films grown by molecular beam epitaxy with thickness from 2 ML to 6 ML.ARPES measurements show that PtTe2 films still remain metallic even down to 2 ML thickness, which is in sharp contrast to the semiconducting property of few layer PtSe2 films. Moreover, a transition from 2D metal to 3D type-II Dirac semimetal occurs at film thickness of 4–6 ML. In addition, Spin-ARPES measurements reveal helical spin textures induced by local Rashba effect in the bulk PtTe2 crystal, suggesting that similar hidden spin is also expected in few monolayer PtTe2 films. Our work reveals the transition from2D metal to 3D topological semimetal and provides new opportunities for investigating metallic 2D films with local Rashba effect. | Ke Deng Mingzhe Yan Chu-Ping Yu Jiaheng Li Xue Zhou Kenan Zhang Yuxin Zhao Koji Miyamoto Taichi Okuda Wenhui Duan Yang Wu Xiaoyan Zhong Shuyun Zhou | 2019 | Science Bulletin2019，64，15： | 1 |
| 2 | Growth of large scale PtTe,PtTe_(2) and PtSe_(2) films on a wide range of substrates显示文摘1T phase of transition metal dichalcogenides(TMDCs)formed by group 10 transition metals(e.g.Pt,Pd)have attracted increasing interests due to their novel properties and potential device applications.Synthesis of large scale thin films with controlled phase is critical especially considering that these materials have relatively strong interlayer interaction and are difficult to exfoliate.Here we report the growth of centimeter-scale PtTe,1T-PtTe2 and 1T-PtSe2 films via direct deposition of Pt metals followed by tellurization or selenization.We find that by controlling the Te flux,a hitherto-unexplored PtTe phase can also be obtained,which can be further tuned into PtTe2 by high temperature annealing under Te flux.These films with different thickness can be grown on a wide range of substrates,including NaCl which can be further dissolved to obtain free-standing PtTe2 or PtSe2 films.Moreover,a systematic thickness dependent resistivity and Hall conductivity measurements show that distinguished from the semiconducting PtSe2 with hole carriers,PtTe2 and PtTe films are metallic.Our work opens new opportunities for investigating the physical properties and potential applications of group 10 TMDC films and the new monochalcogenide PtTe film. | Kenan Zhang Meng Wang Xue Zhou Yuan Wang Shengchun Shen Ke Deng Huining Peng Jiaheng Li Xubo Lai Liuwan Zhang Yang Wu Wenhui Duan Pu Yu Shuyun Zhou | 2021 | Nano Research2021，14，6： | 1 |
| 3 | Cotton flooding and drought analysis regarding growth stages in Hubei,China,using a daily agrometeorological index显示文摘Cotton yield is restricted worldwide by flooding and drought that occur across various growth stages.In this study,cotton flooding and drought in Hubei(a major cotton-production province in China)from 1961 to 2019 were analyzed regarding growth stages through a daily index named the standardized antecedent precipitation evapotranspiration index(SAPEI).In addition,the impacts of flooding and drought on cotton climatic yield were quantified using multiple regression models.The results showed that the temporal trends of cotton flooding and drought intensities were generally smooth,except for an obvious downward trend for cotton drought intensity at the flowering and boll-forming stage.Additionally,cotton drought intensity varied more drastically than that of flooding over the years.Cotton-flooding proneness was much greater than cotton-drought proneness at all growth stages,and the most flooding-prone and drought-prone periods were identified as the flowering and boll-forming stage and the budding stage,respectively.In terms of spatial distribution,northeastern Hubei and southwestern Hubei were most prone to flooding and drought,respectively.The SAPEI-based regression model(R2=0.490,p<0.001),obviously outperforming the SPEI-based model(R2=0.278,p<0.05),revealed that both cotton flooding and drought exhibited negatively significant effects on cotton climatic yield and that the yield-reducing effect of cotton flooding was much greater than that of drought.Moreover,when growth stages were further considered using regression analysis,only the flowering and boll-forming stage was detected with a significant yield-reducing effect of cotton flooding.In conclusion,the SAPEI can effectively assist in monitoring cotton flooding and drought;cotton flooding,especially during the flowering and boll-forming stage and that occurring in northeastern Hubei,is the key issue for cotton field water management in Hubei. | Long Qian Cheng Chen Xiaohong Chen Wenzhi Zeng Yawen Gao Kenan Deng | 2023 | International Journal of Agricultural and Biological Engineering2023，16，4： | 0 |
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