Epitaxial growth and air-stability of monolayer Cu2Te  

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 钱凯;高蕾;李航;张帅;严佳浩;刘晨;王嘉鸥;钱天;丁洪;张余洋;林晓;杜世萱;高鸿钧(Institute of Physics&University of Chinese Academy of Sciences,Chinese Academy of Sciences,Beijing 100190,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]Institute of Physics&University of Chinese Academy of Sciences,Chinese Academy of Sciences,Beijing 100190,China [2]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Chinese Physics B》2020年第1期99-102,共4页中国物理B（英文版）

基　　金：Project supported by the National Key Research&Development Program of China(Grant Nos.2016YFA0202300 and 2018YF A0305800);the National Natural Science Foundation of China(Grant Nos.61888102,11604373,61622116,and 51872284);the CAS Pioneer Hundred Talents Program,China,the Strategic Priority Research Program of Chinese Academy of Sciences(Grant Nos.XDB30000000 and XDB28000000);Beijing Nova Program,China(Grant No.Z181100006218023);the University of Chinese Academy of Sciences

摘　　要：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.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 a √3×√3superstructure 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 

分 类 号：O782.9[理学—晶体学] TB383.1[一般工业技术—材料科学与工程]