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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 | Optimization of Polishing Parameters with Taguchi Method for LBO Crystal in CMP显示文摘Chemical mechanical polishing(CMP)was used to polish Lithium triborate(LiB3O5 or LBO)crystal.Taguchi method was applied for optimization of the polishing parameters.Material removal rate(MRR)and surface roughness are considered as criteria for the optimization.The polishing pressure,the abrasive concentration and the table velocity are important parameters which influence MRR and surface roughness in CMP of LBO crystal.Experiment results indicate that for MRR the polishing pressure is the most significant polishing parameter followed by table velocity;while for the surface roughness,the abrasive concentration is the most important one.For high MRR in CMP of LBO crystal the optimal conditions are:pressure 620 g/cm2, concentration 5.0 wt pct,and velocity 60 r/min,respectively.For the best surface roughness the optimal conditions are:pressure 416 g/cm2,concentration 5.0 wt pct,and velocity 40 r/min,respectively.The contributions of individual parameters for MRR and surface roughness were obtained. | Jun Li Yongwei Zhu Dunwen Zuo Yong Zhu Chuangtian Chen | 2009 | Journal of Materials Science & Technology2009，25，5： | 4 |
| 3 | Study of the Retracing Behavior of the Phase-Matching Angle in Second Harmonic Generation显示文摘The retracing behavior of the phase-matching angle(RBPA)in many nonlinear optical crystals for second harmonic generation(SHG)has been demonstrated by calculation.The generality of this phenomenon is successfully explained by a theoretical analysis based on classical optics.The wavelengths of the fundamental waves and phasematching angles for describing the RBPA of eight kinds of crystals are presented.Furthermore,we point out that RBPA exists generally in both uniaxial and biaxial crystals for both type Ⅰ and type Ⅱ SHG. | LIU Xiang DENG Daoqun WU Ling-an XU Zuyan CHEN Chuangtian WU Baichang | 1994 | Chinese Physics Letters1994，11，5： | 1 |
| 4 | 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 |
| 5 | Flux growth and characterization of a new oxyborate crystal Na3La9O3(BO3)8显示文摘 | Zhang Guochun Wu Yicheng Li Yunge Chang Feng Pan Shilie Fu Peizhen Chen Chuangtian | 2005 | Journal of Crystal Growth2005，275，12： | 1 |
| 6 | Flux growth of BaAlBO 3 F 2 crystals显示文摘 | Yinchao Yue Zhanggui Hu Chuangtian Chen | 2008 | Journal of Crystal Growth2008，，6： | 1 |
| 7 | The Vacuum Ultraviolet Phase-matching Characteristics of Nonlinear Op- tical KBe2BO3F2 Crystal 显示文摘 | CHEN Chuangtian XU Zuyan DENG Daoqun | 1996 | Appl Phys Lett1996，68，21： | 1 |
| 8 | Improved Sellmeier Equations and Phasematehing Characteristics in Deep-ultraviolet Region of KBe2BO3F2 Crystal 显示文摘 | CHEN Chuangtian WANG Guiling WANG Xiaoyang | 2008 | IEEE Journal of Quantum Electronics2008，44，7： | 1 |
| 9 | Determination of Nonlinear Optical Coefficients of KBe2BO3Fz Crystal 显示文摘 | WANG Guiling ZHANG Chengqian CHEN Chuangtian | 2003 | Chin Phys Lett ($1671-7694)2003，20，2： | 1 |
| 10 | Absorption-edge calculations of inorganic nonlinear optical crystals 显示文摘 | WU Kechen CHEN Chuangtian | 1992 | Appl Phys A1992，54，3： | 1 |
| 11 | Recent advances in deep and vacuum-UV harmonic generation with KBBF crystal显示文摘 | Chen Chuangtian | 2004 | Optical Materals2004，26，4： | 1 |
| 12 | Determination of nonlinear optical coefficients of KB2BO3F2 crystal显示文摘 | Wang Guiling Zhang Chengqian Chen Chuangtian | 2003 | Chin Phys Lett2003，20，2： | 1 |
| 13 | Nonlinear optical materials based on MBe2 BO3 F2 ( M = Na, K)显示文摘 | MEI Linfeng WANG Yebin CHEN Chuangtian | 1993 | J Appl Phys1993，74，： | 1 |
| 14 | Design and synthesis of an ultraviolet transparent nonlinear optical crystal Sr2Be2B2O7显示文摘 | CHEN Chuangtian WANG Yebin WU Baichang | 1995 | Nature1995，373，： | 1 |
| 15 | 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 |
| 16 | New development of nonlinear optical crystals for the ul- traviolet region with molecular engineering approach 显示文摘 | CHEN Chuangtian WANG Yebin XIA Younan | 1995 | J Appl Phys1995，77，6： | 1 |
| 17 | Flux Growth of BaAlBO3F2 Crystals 显示文摘 | Yue Yinchao Hu Zhanggui Chen Chuangtian | 2008 | Journal of Crystal Growth2008，310，： | 1 |
| 18 | Efficient Generation of Deep Ultraviolet Radiation Using LiB_(3)O_(5) Crystal显示文摘Efficient generation of deep ultraviolet radiation at wavelength of less than 0.20 μm obtained by using LiB_(3)O_(5) crystal is reported.High power radiation at 0.1914μm has been produced via sum-frequency-mixing of two waves with wavelengths of 0.2128 and 1.9071μm in LiB_(3)O_(5) crystal.An average output power of about 2.0mW and a conversion efficiency of 8%have been achieved. | XIE Fali WU Baichang MAO Hongwei CHEN Chuangtian | 1992 | Chinese Physics Letters1992，9，5： | 1 |
| 19 | CALCULATION OF THE SECOND-ORDER OPTICAL SUSCEPTIBILITIES OF SOME BENZENE DERIVATIVE MOLECULES AND CRYSTALS显示文摘The microscopic and macroscopic second-order optical susceptibilities of ten benzene derivative molecules and three crystals were calculated and discussed,basing on the nonlinear optical active group theory. | LIN Shujie CHEN Chuangtian | 1990 | Chinese Physics Letters1990，7，6： | 0 |
| 20 | TUNABLE HIGH-POWER BaB_(2)O_(4) OPTICAL PARAMETRIC OSCILLATOR PUMPED AT 355nm显示文摘We report the operation of aβ-BaB_(2)O_(4)(BBO)optical parametric oscillator(OPO)broadly tunable in the visible and the near infrared.Quantum efficiency of 22.7%for the signal and 34.1%for the idler corresponding to the total energy conversion efficiency of 25.9%has been achieved.The maximum average output power and the maximum output energy reached 220m W and 22rnJ/pulse,respectively.By changing the matching angle of the OPO,the output wavelength was continuously scanned throughout 425-2144nm. | XU Zuyan DENG Daoqun WANG Yunping ZHENG Wanhua LIU Xiang WU Baichang CHEN Chuangtian | 1990 | Chinese Physics Letters1990，7，9： | 0 |
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