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| 1 | Temperature-induced Lifshitz transition in topological insulator candidate HfTe_5显示文摘The ongoing discoveries and studies of novel topological quantum materials have become an emergent and important field of condensed matter physics.Recently,HfTe_5 ignited renewed interest as a candidate of a novel topological material.The single-layer HfTe_5 is predicted to be a two-dimensional large band gap topological insulator and can be stacked into a bulk that may host a temperature-driven topological phase transition.Historically,HfTe_5 attracted considerable interest for its anomalous transport properties characterized by a peculiar resistivity peak accompanied by a sign reversal carrier type.The origin of the transport anomaly remains under a hot debate.Here we report the first high-resolution laser-based angle-resolved photoemission measurements on the temperature-dependent electronic structure in HfTe_5.Our results indicated that a temperature-induced Lifshitz transition occurs in HfTe_5,which provides a natural understanding on the origin of the transport anomaly in HfTe_5.In addition,our observations suggest that HfTe_5 is a weak topological insulator that is located at the phase boundary between weak and strong topological insulators at very low temperature. | Yan Zhang Chenlu Wang Guodong Liu Aiji Liang Lingxiao Zhao Jianwei Huang Qiang Gao Bing Shen Jing Liu Cheng Hu Wenjuan Zhao Genfu Chen Xiaowen Jia Li Yu Lin Zhao Shaolong He Fengfeng Zhang Shenjin Zhang Feng Yang Zhimin Wang Qinjun Peng Zuyan Xu Chuangtian Chen Xingjiang Zhou | 2017 | Science Bulletin2017，62，13： | 4 |
| 2 | Relationship between the parent charge transfer gap and maximum transition temperature in cuprates显示文摘One of the biggest puzzles concerning the cuprate high temperature superconductors is what determines the maximum transition temperature(Tc,max), which varies from less than 30 to above 130 K in different compounds.Despite this dramatic variation, a robust trend is that within each family, the double-layer compound always has higher Tc,maxthan the single-layer counterpart. Here we use scanning tunneling microscopy to investigate the electronic structure of four cuprate parent compounds belonging to two different families. We find that within each family, the double layer compound has a much smaller charge transfer gap size(DCT), indicating a clear anticorrelation between DCTand Tc,max. These results suggest that the charge transfer gap plays a key role in the superconducting physics of cuprates, which shed important new light on the high Tc mechanism from doped Mott insulator perspective. | Wei Ruan Cheng Hu Jianfa Zhao Peng Cai Yingying Peng Cun Ye Runze Yu Xintong Li Zhenqi Hao Changqing Jin Xingjiang Zhou Zheng-Yu Weng Yayu Wang | 2016 | Science Bulletin2016，61，23： | 3 |
| 3 | Zbed3 participates in the subcortical maternal complex and regulates the distribution of organelles显示文摘我们以前识别了 subcortical 在老鼠为早 embryogenesis 和女富饶是必要的母亲的建筑群(SCMC ) 。然而, SCMC 由影响女富饶的分子的机制大部分仍然是 uncharacterized。这里,我们报导那新奇母亲的蛋白质,包含 3 的锌手指床类型(Zbed3 ) ,参予 SCMC。母亲的 Zbed3 的弄空导致女性的减少的肥沃,因为在变异的胚胎的一个比例的损害并且推迟的发展。母亲的 Zbed3 的损失在影响卵母细胞和接合子导致不对称的 zygotic 分割和细胞器的反常分布,类似于与破坏核心 SCMC 基因在女性观察的显型。进一步的调查表明这些显型与微导管的破坏动力学或细胞质的格子(CPL ) 的形成被联系。Zbed3 的稳定性和本地化取决于,但是没被要求为, SCMC 的形成。因此,我们的数据作为调停的下游的蛋白质之一建议 Zbed3 SCMC 功能并且在女富饶提供进一步的卓见进 SCMC 和 CPL 的角色。 | Zheng Gao Xiaoxin Zhang Xingjiang Yu Dandan Qin Yi Xiao Yang Yu Yunlong Xiang Xiaoqing Nie Xukun Lu Wenbo Liu Zhaohong Yi Lei Li | 2018 | Journal of Molecular Cell Biology2018，10，1： | 2 |
| 4 | Electronic structure of exfoliated millimeter-sized monolayer WSe2 on silicon wafer显示文摘The mono layer WSe2 is in teresting and important for future application in nanoelectronics,spintronics and valleytronics devices,because it has the largest spin splitting and Ion gest valley coherence time among all the known monolayer transition-metal dichalcogenides(TMDs).Toobtain the large-area monolayer TMDs'crystal is the first step to manu facture scalable and high-performance electronic devices.In this letter,we have successfully fabricated millimeter-sized mono layer WSe2 single crystals with very high quality,based on our improved mecha nicalexfoliation method.With such superior samples,using standard high resolution angle-resolved photoemission spectroscopy,we didcomprehe nsive electronic band structure measurements on our mono layer WSe2.The overall band features point it to be a 1.2 eV direct bandgap semico nductor.Its spin splitting of the valence band at K point is found as 460 meV,which is 30 meV less than the corresponding band splitting in its bulk counterpart.The effective hole masses of valence bands are determined as 2.344 me atГ,and 0.529 me as well as 0.532 meat K for the upper and lower branch of splitting ban ds,respectively.And screening effect from substrate is shown to substa ntially impact onthe electronic properties.Our results provide importa nt insights into band structure engineering in mono layer TMDs.Our mono layer WSe2 crystals may constitute a valuable device platform. | Wenjuan Zhao Yuan Huang Cheng Shen Cong Li Yongqing Cai Yu Xu Hongtao Rong Qiang Gao Yang Wang Lin Zhao Lihong Bao Qingyan Wang Guangyu Zhang Hongjun Gao Zuyan Xu Xingjiang Zhou Guodong Liu | 2019 | Nano Research2019，12，12： | 2 |
| 5 | Optimal pro-portional reinsurance and investment with transaction cost maximizing the terminal wealth 显示文摘 | Xinli ZHANG Kecun ZHANG Xingjiang YU | 2008 | Insurance: Mathematical and Eco- nomics:2008，44，： | 1 |
| 6 | Emergence of superconductivity from fully incoherent normal state in an iron-based superconductor (Ba_(0.6)K_(0.4))Fe_2As_2显示文摘In unconventional superconductors, it is generally believed that understanding the physical properties of the normal state is a pre-requisite for understanding the superconductivity mechanism. In conventional superconductors like niobium or lead, the normal state is a Fermi liquid with a well-defined Fermi surface and well-defined quasipartcles along the Fermi surface. Superconductivity is realized in this case by the Fermi surface instability in the superconducting state and the formation and condensation of the electron pairs(Cooper pairing). The high temperature cuprate superconductors, on the other hand, represent another extreme case that superconductivity can be realized in the underdoped region where there is neither well-defined Fermi surface due to the pseudogap formation nor quasiparticles near the antinodal regions in the normal state. Here we report a novel scenario that superconductivity is realized in a system with well-defined Fermi surface but without quasiparticles along the Fermi surface in the normal state.High resolution laser-based angle-resolved photoemission measurements have been performed on an optimally-doped iron-based superconductor(Ba_(0.6)K_(0.4))Fe_2As_2. We find that, while sharp superconducting coherence peaks emerge in the superconducting state on the hole-like Fermi surface sheets, no quasiparticle peak is present in the normal state. Its electronic behaviours deviate strongly from a Fermi liquid system. The superconducting gap of such a system exhibits an unusual temperature dependence that it is nearly a constant in the superconducting state and abruptly closes at Tc. These observations have provided a new platform to study unconventional superconductivity in a non-Fermi liquid system. | Jianwei Huang Lin Zhao Cong Li Qiang Gao Jing Liu Yong Hu Yu Xu Yongqing Cai Dingsong Wu Ying Ding Cheng Hu Huaxue Zhou Xiaoli Dong Guodong Liu Qingyan Wang Shenjin Zhang Zhimin Wang Fengfeng Zhang Feng Yang Qinjun Peng Zuyan Xu Chuangtian Chen Xingjiang Zhou | 2019 | Science Bulletin2019，64，1： | 1 |
| 7 | Multidisciplinary Stepwise Management Strategy for Acute Superior Mesenteric Venous Thrombosis: An Intestinal Stroke Center Experience显示文摘 | Shuofei Yang Xinxin Fan Weiwei Ding Baochen Liu Jiaxiang Meng Dandan Xu Changsheng He Wenkui Yu Xingjiang Wu Jieshou Li | 2014 | Thrombosis Research2014，，： | 1 |
| 8 | A computational model of topological and geometric recovery for visual curve completion显示文摘Visual curve completion is a fundamental problem in understanding the principles of the human visual system. This problem is usually divided into two problems: a grouping problem and a shape problem.On one hand, though perception of the visually completed curve is clearly a global task(for example,a human perceives the Kanizsa triangle only when seeing all three black objects), conventional methods for solving the grouping problem are generally based on local Gestalt laws. On the other hand, the shape of the visually completed curve is usually recovered by minimizing shape energy in existing methods.However, not only do these methods lack mechanisms to adjust the shape of the recovered visual curve using perceptual, psychophysical, and neurophysiological knowledge, but it is also difficult to calculate an explicit representation of the visually completed curve. In this paper, we present a systematic computational model for generating a visually completed curve. Firstly, based on recent studies of perception, psychophysics, and neurophysiology, we formulate a grouping procedure based on the human visual system by seeking a minimum Hamiltonian cycle in a graph, solving the grouping problem in a global manner. Secondly, we employ a B′ezier curve-based model to represent the visually completed curve. Not only is an explicit representation deduced, but we also present a means to integrate knowledge from related areas, such as perception, psychophysics, and neurophysiology, and so on. The proposed computational model has been validated using many modal and amodal completion examples, and desirable results were obtained. | Hongwei Lin Zihao Wang Panpan Feng Xingjiang Lu Jinhui Yu | 2016 | Computational Visual Media2016，2，4： | 1 |
| 9 | In situ carrier tuning in high temperature superconductor Bi2Sr2CaCu2O(8+δ)by potassium deposition显示文摘We report a successful tuning of the hole doping level over a wide range in high temperature superconductor Bi_2Sr_2CaCu_2O_(8+δ)(Bi2212) through successive in situ potassium(K) deposition. By taking high resolution angleresolved photoemission measurements on the Fermi surface and band structure of an overdoped Bi2212(T_c= 76 K) at different stages of K deposition, we found that the area of the hole-like Fermi surface around the Brillouin zone corner(p,p) shrinks with increasing K deposition. This indicates a continuous hole concentration change from initial 0.26 to eventual 0.09 after extensive K deposition, a net doping level change of 0.17 that makes it possible to bring Bi2212 from being originally overdoped, to optimally-doped, and eventually becoming heavily underdoped. The electronic behaviors with K deposition are consistent with those of Bi2212 samples with different hole doping levels. These results demonstrate that K deposition is an effective way of in situ controlling the hole concentration in Bi2212. This work opens a good way of studying the doping evolution of electronic structure and establishing the electronic phase diagram in Bi2212 that can be extended to other cuprate superconductors. | Yuxiao Zhang Cheng Hu Yong Hu Lin Zhao Ying Ding Xuan Sun Aiji Liang Yan Zhang Shaolong He Defa Liu Li Yu Guodong Liu Xiaoli Dong Genda Gu Chuangtian Chen Zuyan Xu Xingjiang Zhou | 2016 | Science Bulletin2016，61，13： | 1 |
| 10 | FIVE NEW DITERPENES FROM EUPHORBIA SIEBOLDIANA显示文摘Five new diterpenes were isolated from Euphorbia sieboldianaand identified as atis-16-en-13(S)-hydroxy-3,14-dione(Ⅰ),atis-16-en-14-oxo-13(S),3 β-diol(Ⅱ),atisane-3-oxo-16α,17-diol(Ⅳ),atisane-3β,16α,17-triol(Ⅴ)and atisane-3β-acetyl-16α,17-diol(Ⅵ)based onthe chemical,spectral evidences and X-ray diffraction. | Yi Li DING Zhong Jian JIA Yu Ting LIU Institute of Organic Chemistry of Lanzhou University Lanzhou,730000,China Chemistry Department of Xingjiang,Wulumuqi. | 1990 | Chinese Chemical Letters1990，1，1： | 1 |
| 11 | The improved discharge performance of Li/CF x batteries by using multi-walled carbon nanotubes as conductive additive显示文摘 | Yu Li Yanfang Chen Wei Feng Fei Ding Xingjiang Liu | 2010 | Journal of Power Sources2010，，： | 1 |
| 12 | Anti-corrosive, weatherproof and self-healing polyurethane developed from hydrogenated hydroxyl-terminated polybutadiene toward surface-protective applications显示文摘Self-healing polyurethane(PU)faces aging deterioration due to active dynamic bonds,which remain a challenging predicament for practical use.In this work,a novel strategy is developed to address this predicament by leveraging the hydrophobicity and gas barrier of hydrogenated hydroxyl-terminated polybutadiene(HHPB).The dynamic oxime-carbamate bonds derived from 2,4-pentanedione dioxime(PDO)enable the elastomer to exhibit surface self-repairability upon applied mild heat and achieve~99.5%mechanical self-healing efficiency.The mechanical properties remained nearly intact after 30-d exposure to thermal oxidation,xenon lamp,acids,bases,and salts.Gas permeability,positron annihilation lifetime spectroscopy(PALS),and contact angle measurements reveal the pivotal role of gas barrier,free volume,and hydrophobicity in blocking undesirable molecules and ions which effectively protects the elastomer from deterioration.HHPB-PU also exhibits excellent adhesion to steel substrate.The shear strength achieves(3.02±0.42)MPa after heating at 80°C for 4 h,and(3.06±0.2)MPa after heating at 130°C for 0.5 h.Regarding its outstanding anti-corrosive and weatherproof performances,this self-healable elastomer is a promising candidate in surface-protective applications. | Yuanyuan LIU Xin DU Hui WANG Yu YUAN Liuhe WEI Xingjiang LIU Ailing SUN Yuhan LI | 2022 | Frontiers of Materials Science2022，16，2： | 0 |
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