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The FAST all sky HI survey(FASHI):The first release of catalog

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 112-133页

作者： Chuan-Peng Zhang Ming Zhu Peng Jiang Cheng Cheng Jing Wang Jie Wang Jin-Long Xu Xiao-Lan Liu Nai-Ping Yu Lei Qian Haiyang Yu Mei Ai Yingjie Jing Chen Xu Ziming Liu Xin Guan Chun Sun Qingliang Yang Menglin Huang Qiaoli Hao FAST Collaboration Guizhou Radio Astronomical Observatory Guizhou UniversityGuiyang 550000China National Astronomical Observatories Chinese Academy of Sciences(CAS)Beijing 100101China Chinese Academy of sciences South America center for Astronomy National Astronomical ObservatoriesCASBeijing 100101China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China

The FAST All Sky HI survey(FASHI)was designed to cover the entire sky observable by the Five-hundred-meter Aperture Spherical radio Telescope(FAST),spanning approximately 22000 square degrees of declination between-14°and+66°,and in the frequency range of 1050-1450 MHz,with the expectation of eventually detecting more than 100000 HI *** August 2020 and June 2023,FASHI had covered more than 7600 square degrees,which is approximately 35%of the total sky observable by *** has a median detection sensitivity of around 0.76 m Jy beam-1and a spectral line velocity resolution of~6.4 km s-1at a frequency of~1.4 *** of now,a total of 41741 extragalactic HI sources have been detected in the frequency range 1305.5-1419.5 MHz,corresponding to a redshift limit of z■*** cross-matching FASHI sources with the Siena Galaxy Atlas(SGA)and the Sloan Digital Sky Survey(SDSS)catalogs,we found that 16972(40.7%)sources have spectroscopic redshifts and 10975(26.3%)sources have only photometric *** of the remaining 13794(33.0%)HI sources are located in the direction of the Galactic plane,making their optical counterparts difficult to identify due to high extinction or high contamination of Galactic stellar *** on current survey results,the FASHI survey is an unprecedented blind extragalactic H I *** has higher spectral and spatial resolution and broader coverage than the Arecibo Legacy Fast ALFA Survey(ALFALFA).When completed,FASHI will provide the largest extragalactic HI catalog and an objective view of HI content and large-scale structure in the local universe.

关键词： surveys redshifts galaxies telescope radio lines HI line

Unveiling strain-enhanced moiréexciton localization in twisted van der Waals homostructures

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Nano Research 2024年第4期17卷 3245-3252页

作者： Henry Rui He Haihong Zheng Biao Wu Shaofei Li Junnan Ding Zongwen Liu Jian-Tao Wang Anlian Pan Yanping Liu Institute of Quantum Physics School of PhysicsCentral South UniversityChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service performance Central South UniversityChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China College of Materials Science and Engineering Hunan UniversityChangsha 410082China State Key Laboratory of high-performance Complex Manufacturing Central South UniversityChangsha 410083China Shenzhen Research Institute of Central South university Shenzhen 51800China

Moirésuperlattices,arising from the controlled twisting of van der Waals homostructures at specific angles,have emerged as a promising platform for quantum emission ***,the manipulation of strain provides a versatile strategy to finely adjust electronic band structures,enhance exciton luminescence efficiency,and establish a robust foundation for two-dimensional quantum light ***,the intricate interplay between strain and moirépotential remains partially ***,we introduce a meticulously designed fusion of strain engineering and the twisted 2L-WSe_(2)/2L-WSe_(2) homobilayers,resulting in the precise localization of moiré*** low-temperature photoluminescence spectroscopy,we unveil the emergence of highly localized moiré-enhanced emission,characterized by the presence of multiple distinct emission ***,our investigation demonstrates the effective regulation of moirépotential depths through strain engineering,with the potential depths of strained and unstrained regions differing by 91%.By combining both experimental and theoretical approaches,our study elucidates the complex relationship between strain and moirépotential,thereby opening avenues for generating strain-induced moiréexciton single-photon sources.

关键词： moirésuperlattices strain engineering moiréexcitons moirépotential

The proximity between hydroxyl and single atom determines the catalytic reactivity of Rh1/CeO_(2) single-atom catalysts

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Nano Research 2024年第1期17卷 397-406页

作者： Danfeng Wu Shuyun Zhou Congcong Du Juan Li Jianyu Huang Hong-xia Shen Abhaya K.Datye Shan Jiang Jeffrey T.Miller Sen Lin Haifeng Xiong State Key Laboratory of physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China Clean Nano Energy center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China College of Biology and Chemical Engineering Jiaxing UniversityJiaxing 314000China Department of Chemical&Biological Engineering University of New MexicoAlbuquerqueNM 8731-0001USA Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIN 47907-2100USA Innovation Laboratory for sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361102China Fujian Key Laboratory of Rare-earth Functional Materials Fujian Shanhai Collaborative Innovation Center of Rare-earth Functional MaterialsLongyan 366300China

The local structure of the metal single-atom site is closely related to the catalytic activity of metal single-atom catalysts(SACs).However,constructing SACs with homogeneous metal active sites is a challenge due to the surface heterogeneity of the conventional ***,we prepared two Rh1/CeO_(2)SACs(0.5Rh1/r-CeO_(2)and 0.5Rh1/c-CeO_(2),respectively)using two shaped CeO_(2)(rod and cube)exposing different facets,i.e.,CeO_(2)(111)and CeO_(2)(100).In CO oxidation reaction,the T100 of 0.5Rh1/r-CeO_(2)SACs is 120°C,while the T100 of 0.5Rh1/c-CeO_(2)SACs is as high as 200°*** in-situ CO diffuse reflectance infrared Fourier transform spectroscopy(CO-DRIFTS),we found that the proximity between OH group and Rh single atom on the plane surface plays an important role in the catalytic activity of Rh1/CeO_(2)SAC system in CO *** Rh single atom trapped at the CeO_(2)(111)crystal surface forms the Rh1(OH)adjacent species,which is not found on the CeO_(2)(100)crystal surface at room ***,during CO oxidation,the OH group far from Rh single atom on the 0.5Rh1/c-CeO_(2)disappears and forms Rh1(OH)adjacent species when the temperature is above 150°*** formation of Rh1(OH)adjacentCO intermediate in the reaction is pivotal for the excellent catalytic activity,which explains the difference in the catalytic activity of Rh single atoms on two different CeO_(2)*** formed Rh1(OH)adjacent-O-Ce structure exhibits good stability in the reducing atmosphere,maintaining the Rh atomic dispersion after CO oxidation even when pre-reduced at high temperature of 500°*** functional theory(DFT)calculations validate the unique activity and reaction path of the intermediate Rh1(OH)adjacentCO species *** work demonstrates that the proximity between metal single atom and hydroxyl can determine the formation of active intermediates to affect the catalytic performances in catalysis.

关键词： crystal plane Rh1/CeO_(2)single-atom catalyst proximity of Rh and hydroxyl coordination structure CO oxidation

Ultra-low-loss on-chip zero-index materials

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Light(Science & Applications) 2021年第1期10卷 106-114页

作者： Tian Dong Jiujiu Liang Sarah Camayd-Munoz Yueyang Liu Haoning Tang Shota Kita Peipei Chen Xiaojun Wu Weiguo Chu Eric Mazur Yang Li State Key Laboratory of Precision Measurement Technology and Instrument Department of Precision InstrumentTsinghua University100084 BeijingChina John A.Paulson School of Engineering and Applied sciences Harvard UniversityCambridgeMA 02138USA CAS Key Laboratory for Nanophotonic Materials and Devices Nanofabrication LaboratoryCAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology100190 BeijingChina Department of Electronic and Information Engineering Beihang University100191 BeijingChina

Light travels in a zero-index medium without accumulating a spatial phase,resulting in perfect spatial *** coherence brings several potential applications,including arbitrarily shaped waveguides,phase-mismatch-free nonlinear propagation,large-area single-mode lasers,and extended superradiance.A promising platform to achieve these applications is an integrated Dirac-cone material that features an impedance-matched zero *** an integrated Dirac-cone material eliminates ohmic losses via its purely dielectric structure,it still entails out-of-plane radiation loss,limiting its applications to a small *** design an ultra-low-loss integrated Dirac cone material by achieving destructive interference above and below the *** material consists of a square array of low-aspectratio silicon pillars embedded in silicon dioxide,featuring easy fabrication using a standard planar *** design paves the way for leveraging the perfect spatial coherence of large-area zero-index materials in linear,nonlinear,and quantum optics.

关键词： index perfect purely

Milestones in Molecular Dynamics Simulations of Single-Walled Carbon Nanotube Formation: A Brief Critical Review

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Nano Research 2009年第10期2卷 755-767页

作者： Stephan Irle Yasuhito Ohta Yoshiko Okamoto Alister JPage Ying Wang Keiji Morokuma Fukui Institute for Fundamental Chemistry Kyoto UniversityKyoto 606-8103Japan Institute for Advanced Research and Department of Chemistry Nagoya UniversityNagoya 464-8602Japan Cherry L.Emerson center for Scientic Computation and Department of Chemistry Emory UniversityAtlantaGA 30322USA Department of Chemistry Nara Women’s UniversityNara 630-8506Japan

We present a brief review of the most important efforts aimed at simulating single-walled carbon nanotube(SWNT)nucleation and growth processes using molecular dynamics(MD)techniques reported in the *** simulations allow the spatio-temporal movement of atoms during nonequilibrium growth to be ***,it is hoped that a successful MD simulation of the entire SWNT formation process will assist in the design of chirality-specic SWNT synthesis *** give special consideration to the role of the metal catalyst particles assumed in standard theories of SWNT formation,and describe the actual metal behavior observed in the reported MD simulations,including our own recent quantum chemical MD *** is concluded that the use of a quantum potential is essential for a qualitatively correct description of the catalytic behavior of the metal cluster,and that carbide formation does not seem to be a necessary requirement for nucleation and growth of SWNTs according to our most recent quantum chemical MD simulations.

关键词： Carbon nanotubes transition metal catalysis molecular dynamics reactive forceelds quantum chemistry

Broadly neutralizing antibodies against Omicron-included SARS-CoV-2 variants induced by vaccination

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Signal Transduction and Targeted Therapy 2022年第5期7卷 1831-1841页

作者： Xiangyang Chi Yingying Guo Guanying Zhang Hancong Sun Jun Zhang Min Li Zhengshan Chen Jin Han Yuanyuan Zhang Xinghai Zhang Pengfei Fan Zhe Zhang Busen Wang Xiaodong Zai Xuelian Han Meng Hao Ting Fang Jinghan Xu Shipo Wu Yi Chen Yingying Fang Yunzhu Dong Bingjie Sun Jinlong Zhang Jianmin Li Guangyu Zhao Changming Yu Qiang Zhou Wei Chen Institute of Biotechnology Academy of Military Medical SciencesBeijing 100071China center for Infectious Disease Research Westlake Laboratory of Life Sciences and BiomedicineKey Laboratory of Structural Biology of Zhejiang ProvinceInstitute of BiologyWestlake Institute for Advanced StudySchool of Life SciencesWestlake UniversityHangzhou 310024 Zhejiang ProvinceChina State Key Laboratory of Pathogen and Biosecurity Institute of Microbiology and EpidemiologyAcademy of Military Medical SciencesBeijing 100071China Wuhan Institute of Virology Center for Biosafety Mega-ScienceChinese Academy of SciencesWuhanHubei 430071China

The SARS-CoV-2 Omicron variant shows substantial resistance to neutralization by infection-and vaccination-induced antibodies,highlighting the demands for research on the continuing discovery of broadly neutralizing antibodies(bnAbs).Here,we developed a panel of bnAbs against Omicron and other variants of concern(VOCs)elicited by vaccination of adenovirus-vectored COVID-19 vaccine(Ad5-nCoV).

关键词： neutral vaccination Omi

Electronic structure of aqueous two-dimensional photocatalyst

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npj Computational Materials 2021年第1期7卷 431-439页

作者： Dawei Kang Xianghua Kong Vincent Michaud-Rioux Ying-Chih Chen Zetian Mi Hong Guo School of Physics and Engineering Henan University of Science and TechnologyLuoyangChina College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhenChina Department of Physics McGill UniversityMontrealQCCanada Department of Electrical Engineering and Computer Science University of MichiganAnn ArborMIUSA

The electronic structure,in particular the band edge position,of photocatalyst in presence of water is critical for photocatalytic water *** propose a direct and systematic density functional theory(DFT)scheme to quantitatively predict band edge shifts and their microscopic origins for aqueous 2D photocatalyst,where thousands of atoms or more are able to be *** scheme is indispensable to correctly calculate the electronic structure of 2D photocatalyst in the presence of water,which is demonstrated in aqueous MoS_(2),GaS,InSe,GaSe and *** is found that the band edge of 2D photocatalysts are not rigidly shifted due to water as reported in previous studies of aqueous ***,the CBM shift is quantitatively explained by geometric deformation,water dipole and charge redistribution effect while the fourth effect,i.e.,interfacial chemical contact,is revealed in the VBM ***,the revealed upshift of CBM in aqueous MoS2 should thermodynamically help carriers to participate in hydrogen evolution reaction(HER),which underpin the reported experimental findings that MoS2 is an efficient HER *** work paves the way to design 2D materials in general as low-cost and high-efficiency photocatalysts.

关键词： catalyst structure quantitatively

Role of chloride on the instability of blue emitting mixed‑halide perovskites

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Frontiers of Optoelectronics 2023年第4期16卷 61-70页

作者： Max Karlsson Jiajun Qin Kaifeng Niu Xiyu Luo Johanna Rosen Jonas Björk Lian Duan Weidong Xu Feng Gao Department of Physics Chemistry and Biology(IFM)Linköping UniversityLinköpingSweden Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China Frontiers Science center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)Northwestern Polytechnical UniversityXi’an 710072China

Although perovskite light-emitting diodes(PeLEDs)have seen unprecedented development in device efciency over the past decade,they sufer signifcantly from poor operational *** is especially true for blue PeLEDs,whose operational lifetime remains orders of magnitude behind their green and red ***,we systematically investigate this efciency-stability discrepancy in a series of green-to blue-emitting PeLEDs based on mixed Br/*** fnd that chloride incorporation,while having only a limited impact on efciency,detrimentally afects device stability even in small *** lifetime drops exponentially with increasing Cl-content,accompanied by an increased rate of change in electrical properties during *** ascribe this phenomenon to an increased mobility of halogen ions in the mixed-halide lattice due to an increased chemically and structurally disordered landscape with reduced migration *** results indicate that the stability enhancement for PeLEDs might require diferent strategies from those used for improving efciency.

关键词： Ion migration Blue electroluminescence Mixed halide perovskites

Shallowing interfacial carrier trap in transition metal dichalcogenide heterostructures with interlayer hybridization

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Nano Research 2021年第5期14卷 1390-1396页

作者： Xu Wu Jingsi Qiao Liwei Liu Yan Shao Zhongliu Liu Linfei Li Zhili Zhu Cong Wang Zhixin Hu Wei Ji Yeliang Wang Hongjun Gao School of Information and Electronics MIIT Key Laboratory for Low-Dimensional Quantum Structure and DevicesBeijing Institute of TechnologyBeijing100081China Institute of Physics&university of Chinese Academy of sciences Chinese Academy of SciencesBeijing100190China Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices Department of PhysicsRenmin University of ChinaBeijing100872China center for Joint Quantum Studies and Department of Physics Tianjin UniversityTianjin300350China CAS center for Excellence in Topological Quantum Computation Beijing100049China

With the unique properties,layered transition metal dichalcogenide(TMD)and its heterostructures exhibit great potential for applications in *** electrical performance,e.g.,contact barrier and resistance to electrodes,of TMD heterostructure devices can be significantly tailored by employing the functional layers,called interlayer *** the interface between different TMD layers,the dangling-bond states normally exist and act as traps against charge carrier *** this study,we propose a technique to suppress such carrier trap that uses enhanced interlayer hybridization to saturate dangling-bond states,as demonstrated in a strongly interlayer-coupled monolayer-bilayer PtSe2 *** hybridization between the unsaturated states and the interlayer electronic states of PtSe2 significantly reduces the depth of carrier traps at the interface,as corroborated by our scanning tunnelling spectroscopic measurements and density functional theory *** suppressed interfacial trap demonstrates that interlayer saturation may offer an efficient way to relay the charge flow at the interface of TMD ***,this technique provides an effective way for optimizing the interface contact,the crucial issue exists in two-dimensional electronic community.

关键词： transition metal dichalcogenide PtSe2 layered heterostructure band alignment strong interlayer interaction