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Epitaxial growth and air-stability of monolayer Cu2Te

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Chinese Physics B 2020年第1期29卷 99-102页

作者： K Qian L gao h Li S Zhang j h Yan C Liu j O Wang T Qian h Ding Y Y Zhang X Lin S X Du h-j gao Institute of Physics&University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China Institute of high Energy Physics Chinese Academy of SciencesBeijing 100049China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

A new two-dimensional atomic crystal, monolayer cuprous telluride（Cu2Te） has been fabricated on a grapheneSi C（0001） substrate by molecular beam epitaxy（MBE）. The low-energy electron diffraction（LEED） characterization shows that the monolayer Cu2Te forms ■ superstructure with respect to the graphene substrate. The atomic structure of the monolayer Cu2Te is investigated through a combination of scanning tunneling microscopy（STM） experiments and density functional theory（DFT） calculations. The stoichiometry of the Cu2Te sample is verified by x-ray photoelectron spectroscopy（XPS） measurement. The angle-resolved photoemission spectroscopy（ARPES） data present the electronic band structure of the sample, which is in good agreement with the calculated results. Furthermore, air-exposure experiments reveal the chemical stability of the monolayer Cu2Te. The fabrication of this new 2D material with a particular structure may bring new physical properties for future applications.

关键词： cuprous telluride(Cu2Te) scanning tunneling microscopy(STM) density functional theory(DFT) chemical stability

Direct Imaging of Molecular Orbitals of Metal Phthalocyanines on Metal Surfaces with an O2-Functionalized Tip of a Scanning Tunneling Microscope

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Nano Research 2011年第6期4卷 523-530页

作者： Zhihai Cheng Shixuan Du Wei Guo Li gao Zhitao Deng Nan jiang haiming Guo hao Tang h. j. gao Institute of Physics Chinese Academy of Sciences RO. Box 603 Beijing 100190 China Center for Material Elaboration and Structural Studies B.P. 94347 31055 Toulouse Cedex France

high-resolution scanning tunneling microscope images of iron phthalocyanine and zinc phthalocyanine molecules on Au（111） have been obtained using a functionalized tip of a scanning tunneling microscope （STM）, and show rich intramolecular features that are not observed using clean tips. Ab initio density functional theory calculations and extended huckel theory calculations revealed that the imaging of detailed electronic states is due specifically to the decoration of the STM tip with O2. The detailed structures are differentiated only when interacting with the highly directional orbitals of the oxygen molecules adsorbed on a truncated, [111]-oriented tungsten tip. Our results indicate a method for increasing the resolution in generic scans and thus, have potential applications in fundamental research based on high-resolution electronic states of molecules on metals, concerning, for example, chemical reactions, and catalysis mechanisms.

关键词： high-resolution scanning tunneling microscope (STM) imaging functionalized STM tip metal phthalocyanines molecular orbital density functional theory calculation

A Unifi ed Geometric Rule for Designing Nanomagnetism in Graphene

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Nano Research 2008年第6期1卷 497-501页

作者： Decai Yu Elizabeth M.Lupton h.j.gao Chao Zhang Feng Liu Department of Materials Science and Engineering University of UtahSalt Lake CityUT 84112USA Institute of Physics Chinese Academy of ScienceBeijing 100080China School of Engineering Physics University of WollongongNSW 2522Australia

Based on the underlying graphene lattice symmetry and an itinerant magnetism model on a bipartite lattice,we propose a unifi ed geometric rule for designing graphene-based magnetic nanostructures:spins are parallel(ferromagnetic(FM))on all zigzag edges which are at angles of 0°and 120°to each other,and antiparallel(antiferromagnetic(AF))at angles of 60°and 180°.The rule is found to be consistent with all the systems that have been studied so *** the rule,we predict several novel graphene-based magnetic nanostructures:0-D FM nanodots with the highest possible magnetic moments,1-D FM nanoribbons,and 2-D magnetic superlattices.

关键词： Nanomagnetism graphene-based nanostructures magnetic ordering

Discontinuous crack-bridging model for fracture toughness analysis of nacre

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Discontinuous crack-bridging model for fracture toughness an...

The 16th Annual Conference of hong Kong Society of Theoretical and Applied Mechanics 2012、The 1st Mainland-hong Kong Youth Forum on Mechanics 2012、The 8th Shanghai-hong Kong Forum on Mechanics and Its Application 2012

作者： Y.Shao h.P.Zhao X.Q.Feng h.j.gao Institute of Biomechanics and Medical Engineering Department of Engineering MechanicsTsinghua University Division of Engineering Brown UniversityProvidenceRI 02912USA

Studying the structure-property relation of biological materials can not only provide insight into the physical mechanisms underlying their superior properties and functions but also benefit the design and fabrication of advanced biomimetic *** this paper,we present a microstructure-based fracture mechanics model to investigate the toughening effect due to the crack-bridging mechanism of *** theoretical analysis demonstrates the crucial contribution of this mechanism to the high toughness of *** is found that the fracture toughness of nacre exhibits distinct dependence on the sizes of platelets,and the optimized ranges for the thickness and length of platelets required to achieve higher fracture toughness are *** addition,the effects of such factors as the mechanical properties of the

关键词： Discontinuous crack-bridging model for fracture toughness analysis of nacre

Magic Changes in Anisotropy of Ultrathin Co/Cu(001)Films with Cs Adsorption

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Magic Changes in Anisotropy of Ultrathin Co/Cu(001)Films wit...

2005年纳米和表面科学与技术全国会议

作者： M.C.Xu h.F.Ma and h.j.gao Nanoscale Physics & Device Laboratory,Institute of Physics,CAS,Beijing 100080

The magnetic properties of ultrathin Co films grown on stepped Cu(001)surfaceswith Cs adsorption were studied by using magneto-optical Kerr *** strength ofthe uniaxial anisotropy along[(?)10]direction induced by steps...

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Four-probe scanning tunneling microscope system for electrical and electro-optical property of nanosystems

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Four-probe scanning tunneling microscope system for electric...

2005年纳米和表面科学与技术全国会议

作者： X.B.he X.Lin j.L.Lu Q.huan j.M.Cai L.gao D.X.Shi h.j.gao Nanoscale Physics and Devices Laboratory,Institute of Physics,CAS,Beijing 100080

A unique four-probe scanning tunneling microscope(F-STM)system in ultrahighvacuum(UhV)has been developed by our *** can provide coarse navigation forevery probe independently with scanning electron microscope(SEM)and finepositioning down to nanometer using STM *** system with fourindependent probes gives us an opportunity to manipulate nanoscale objects,and allows

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Room-temperature ferromagnetism and perfect spin filtering in transition-metal-doped graphyne nanoribbons

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Room-temperature ferromagnetism and perfect spin filtering i...

中国真空学会2014学术年会

作者： j.B.Pan S.X.Du L.D.Pan Y.F.Zhang h.-j.gao S.T.Pantelides Institute of Physics Chinese Academy of Science Department of Physics and Astronomy Vanderbilt University Materials Science & Technology Division Oak Ridge National Laboratory

Ferromagnetism in half-metallic two-dimensional materials can lead to unique spintronics *** we report first-principles calculations that predict monolayer graphyne nanoribbons(GyNRs),analternative to graphene,doped randomly with 3d-series transition metal atoms at high concentrations are ferromagnetic(FM)with Curie temperatures above room ***,Cr-,Fe-and Co-doped GyNRs are half-mettallic with 100%spin polarization at the Fermi level and can act as perfect spin *** high spin polarization of the current is preserved up to large bias *** study provides a basis for the fabrication of GyNRs with high Curie temperature and spin-polarized electron transport properties.

关键词： ferromagnetism spin filtering graphyne nanoribbons

Molecular“Coupled Butterfly”on Ag(110):Experiment and First-principles Calculations

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Molecular“Coupled Butterfly”on Ag(110):Experiment and Firs...

2005年纳米和表面科学与技术全国会议

作者： W.Guo S.X.Du h.-j.gao Nanoscale Physics & Devices Laboratory,Institute of Physics,CAS,Beijing 100080

The adsorption behavior of organic π-conjugated molecules on single crystals is ofgreat interest because their physical and chemical properties are keys for molecularscale self-assembly,which is important to improve properties of electronic andoptoelectronic devices such as light-emitting diodes,field-effect transistors and thinfilm *** studying the adsorption behavior of these molecules theunderstanding of adsorption processes can be *** our work,one aromatic

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EDITORIAL

Acta Mechanica Sinica 2004年第4期 3-3页

作者： S.Y Chen h.j.gao W.Yang

Acta Mechanica Sinica will soon merge into the rapid information network SpringerLink,and will be distributed by *** Spring-Verlag will also produce the printedversion of the journal starting at the first issue of 2005. It is our hope that the joining ofthe prestigious Springer Publishing group will add international recognition of the journal,andto promote rapid communications and citations between the scientists working in China andoversea in the area of *** are deeply indebted to the foundation laid down by the former Editor-in-Chief,Prof.

关键词： EDITORIAL