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Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb
Liang, A. J.,Jiang, J.,Wang, M. X.,Sun, Y.,Kumar, N.,Shekhar, C.,Chen, C.,Peng, H.,Wang, C. W.,Xu, X.,Yang, H. F.,Cui, S. T.,Hong, G. H.,Xia, Y.-Y.,Mo, S.-K.,Gao, Q.,Zhou, X. J.,Yang, L. X.,Felser, C. American Physical Society 2017 Physical review. B Vol.96 No.16
<P>Topological insulators represent unusual topological quantum states, typically with gapped bulk band structure but gapless surface Dirac fermions protected by time-reversal symmetry. Recently, a distinct kind of topological insulator resulting from nonsymmorphic crystalline symmetry was proposed in the KHgX (X = As, Sb, Bi) compounds. Unlike regular topological crystalline insulators, the nonsymmorphic glide-reflection symmetry in KHgX guarantees the appearance of an exotic surface fermion with hourglass shape dispersion (where two pairs of branches switch their partners) residing on its (010) side surface, contrasting to the usual two-dimensional Dirac fermion form. Here, by using high-resolution angle-resolved photoemission spectroscopy, we systematically investigate the electronic structures of KHgSb on both (001) and (010) surfaces and reveal the unique in-gap surface states on the (010) surface with delicate dispersion consistent with the 'hourglass Fermion' recently proposed. Our experiment strongly supports that KHgSb is a nonsymmorphic topological crystalline insulator with hourglass fermions, which serves as an important step to the discovery of unique topological quantum materials and exotic fermions protected by nonsymmorphic crystalline symmetry.</P>
Activation of antiferromagnetic domain switching in exchange-coupled Fe/CoO/MgO(001) systems
Li, Q.,Chen, G.,Ma, T. P.,Zhu, J.,N'Diaye, A. T.,Sun, L.,Gu, T.,Huo, Y.,Liang, J. H.,Li, R. W.,Won, C.,Ding, H. F.,Qiu, Z. Q.,Wu, Y. Z. American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.91 No.13
Development of the 3.7 GHz LHCD System on HL-2A
B. Lu,M. Huang,H. Zeng,X. Y. Bai,X. H. Mao,Z. H. Lu,J. Liang,Z. H. Kang,M. W. Wang,K. Feng,H. Wang,C. Wang,J. Q. Wang,S. Wei,T. Yao,Y. N. Bu,J. Feng,G. Y. Cheng,S. D. Song,D. H. Xia,J. Rao 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
A 2 MW-3.7 GHz lower hybrid current drive (LHCD) system is under development for physicsexperiments on the HL-2A device. The RF Power is generated by four TH2103A klystron amplifiersand propagates in the TE10 mode through WR284 waveguides. The transmission lines with a lengthof 20 m to 30 m are pressurized with 2 bars of nitrogen to decrease the possibility of arcing. Thelauncher, based on the passive-active multi-junction (PAM) concept, has been developed and iscurrently being realized. It was designed for a power spectrum peaked at Nk = 2.75 with goodcoupling properties over a wide range of plasma parameters. The four klystrons are fed by ahigh-voltage power supply (HVPS) based on the pulse step modulation (PSM) concept with a fastswitch-off time of less than ten μs. This system is expected to be in operation within 1 years and willexplore many international thermonuclear experimental reactor (ITER) related LH experiments inthe following years.
Enhancement in the optical transmittance of ZnO:Al powders by Mo co-doping
H. Y. He,Q. Liang 한국물리학회 2012 Current Applied Physics Vol.12 No.3
(Al,Mo)-codoped ZnO powders with a constant molar ratio of Zn:Al (99:1) and various molar ratios of Mo:Al (0e0.02) were synthesized by a sol-gel process and characterized by X-ray diffraction, field emission scanning electron microscopy, and UVevis and luminescent spectrophotometry. The experiments indicated that the powders had random orientation and a slightly larger average particle size that increased with increasing Mo proportion. The Mo doping resulted in the enhancement of transmittance in the UVevisible light range and the widening of the band gap. Optimal efficiency appeared at molar ratio of Mo:Al = 0.01, and Mo doping resulted in the formation of a new emission center and the enhancement of the emissions in range of visible light.
Liang, Q.,Seo, G.,Choi, Y.,Kwak, M.J.,Ge, J.,Rodgers, Mary A.,Shi, M.,Leslie, Benjamin J.,Hopfner, K.P.,Ha, T.,Oh, B.H.,Jung, Jae U. Elsevier Inc., Cell Press Imprint 2014 Cell host & microbe Vol.15 No.2
Robust immune responses are essential for eliminating pathogens but must be metered to avoid prolonged immune activation and potential host damage. Upon recognition of microbial DNA, the cytosolic DNA sensor cyclic GMP-AMP (cGAMP) synthetase (cGAS) produces the second messenger cGAMP to initiate the stimulator of interferon genes (STING) pathway and subsequent interferon (IFN) production. We report that the direct interaction between cGAS and the Beclin-1 autophagy protein not only suppresses cGAMP synthesis to halt IFN production upon double-stranded DNA (dsDNA) stimulation or herpes simplex virus-1 infection, but also enhances autophagy-mediated degradation of cytosolic pathogen DNA to prevent excessive cGAS activation and persistent immune stimulation. Specifically, this interaction releases Rubicon, a negative autophagy regulator, from the Beclin-1 complex, activating phosphatidylinositol 3-kinase class III activity and thereby inducing autophagy to remove cytosolic pathogen DNA. Thus, the cGAS-Beclin-1 interaction shapes innate immune responses by regulating both cGAMP production and autophagy, resulting in well-balanced antimicrobial immune responses.
Thermal analysis and optimization of the new ICRH antenna Faraday Screen in EAST
Q.C. Liang,L.N. Liu,W. Zhang,X.J. Zhang,S. Yuan,Y.Z. Mao,C.M. Qin,Y.S. Wang,H. Yang Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
In Experimental Advanced Superconducting Tokamak (EAST) experiments, to achieve long pulse and high-power ICRH system operation, a new kind of ICRH antenna has been designed. One of the most critical factors in limiting the operation of long pulse and high power is the intense heat load in the front face of the ICRH antenna, especially the Faraday Screen (FS). Therefore, the cooling channels of FS need to be designed. According to thermal-hydraulic analysis, the FS tubes are divided into several groups to achieve more excellent water cooling capability. The number of series and parallel tubes in one group is chosen as six. This antenna went into service in the spring of 2021, and it is delightful that the temperature distribution of the FS tube is below 400 ℃ in 14.5 s and 1.8 MW ICRH system operation. However, the active water-cooling design was not carried out on the upper and lower plates of FS, which led to severe ablations on that region under long pulse and high power operation, and the temperature is up to 800. Therefore, the upper and lower side plates of the FS were designed with water cooling based on thermal-hydraulic analysis. During the 2022 winter experiments, the temperature of ICRH antenna FS was lower than 400 in the pulse of 200s and the power of 1 MW operation.
Y. Q. Ning,B. C. Xie,C. Zhou,H. Q. Liang,M. W. Fu 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.2
Strain-rate sensitivity (SRS) is an important parameter to describe the thermodynamic behavior in plasticdeformation process. In this research, the variation of SRS associated with steady-state DRX in P/Msuperalloys was quantitatively investigated. Based on the theoretical analysis and microstructural observationof the alloy after deformation, the SRS coefficient was employed to identify the deformation mechanismof the alloy. Meanwhile, the corresponding relationship between SRS coefficient m, stress exponent nand deformation mechanism was revealed. The stress exponent n in the Arrhenius constitutive model of P/Msuperalloys was calculated. In addition, it is found there is a relatively stable stress exponent range (n = 4-6),indicating that dislocation evolution played as the major hot deformation mechanism for P/M FGH4096superalloy. Furthermore, the Bergstrom model and Senkov model were used and combined together to estimatethe SRS coefficient in the steady-state DRX and the m value maintains at 0.2-0.22, which are consistentwith the microstructural evolution during hot deformation process. The SRS coefficient distribution mapand power dissipation efficiency distribution map were finally constructed associated with the microstructuralevolution during hot deformation, which can be used to optimize the processing parameters of thesuperalloys.