We report on the formation of two-dimensional monolayer AgTe crystal on Ag(111)substrates.The samples are prepared in ultrahigh vacuum by deposition of Te on Ag(111)followed by annealing.Using a scanning tunneling mic...We report on the formation of two-dimensional monolayer AgTe crystal on Ag(111)substrates.The samples are prepared in ultrahigh vacuum by deposition of Te on Ag(111)followed by annealing.Using a scanning tunneling microscope(STM)and low electron energy diffraction(LEED),we investigate the atomic structure of the samples.The STM images and the LEED pattern show that monolayer AgTe crystal is formed on Ag(111).Four kinds of atomic structures of AgTe and Ag(111)are observed:(i)flat honeycomb structure,(ii)bulked honeycomb,(iii)stripe structure,(iv)hexagonal structure.The structural analysis indicates that the formation of the different atomic structures is due to the lattice mismatch and relief of the intrinsic strain in the AgTe layer.Our results provide a simple and convenient method to produce monolayer AgTe atomic crystal on Ag(111)and a template for study of novel physical properties and for future quantum devices.展开更多
Transition-metal chalcogenides(TMCs)materials have attracted increasing interest both for fundamental research and industrial applications.Among all these materials,two-dimensional(2D)compounds with honeycomb-like str...Transition-metal chalcogenides(TMCs)materials have attracted increasing interest both for fundamental research and industrial applications.Among all these materials,two-dimensional(2D)compounds with honeycomb-like structure possess exotic electronic structures.Here,we report a systematic study of TMC monolayer AgTe fabricated by direct depositing Te on the surface of Ag(111)and annealing.Few intrinsic defects are observed and studied by scanning tunneling microscopy,indicating that there are two kinds of AgTe domains and they can form gliding twin-boundary.Then,the monolayer AgTe can serve as the template for the following growth of Te film.Meanwhile,some Te atoms are observed in the form of chains on the top of the bottom Te film.Our findings in this work might provide insightful guide for the epitaxial growth of 2D materials for study of novel physical properties and for future quantum devices.展开更多
目的：探讨DNA损伤修复酶基因XRCC1Arg194Trp多态性和AGT基因第三外显子Leu84Phe多态性与食管癌易感性的关系。方法：采用病例-对照研究方法分析四川北部地区食管癌病例（n=155）和年龄、性别分布无差异的对照组（n=127）XRCC1基因Arg19...目的：探讨DNA损伤修复酶基因XRCC1Arg194Trp多态性和AGT基因第三外显子Leu84Phe多态性与食管癌易感性的关系。方法：采用病例-对照研究方法分析四川北部地区食管癌病例（n=155）和年龄、性别分布无差异的对照组（n=127）XRCC1基因Arg194Trp多态性和AGT基因第三外显子Leu84Phe多态性,两个基因多态的交互作用和基因多态与吸烟、饮酒之间的交互作用对食管癌易感性的影响。结果：XRCC1基因194位点各基因型在两组间的分布无统计学差异（χ~2=0.614;P=0.736）。AGT基因第三外显子第84位密码子各基因型在两组间的分布无统计学差异（χ~2=1.826;P=0.177）,吸烟、饮酒与AGT基因第三外显子第84位密码子突变基因型TT存在正交互作用,交互作用指数（the synergy index S,S）分别为7.375、17.67。结论：四川北部地区XRCC1基因194位点基因多态性与AGT基因第三外显子Leu84Phe多态性可能与食管癌的易感性无关,但AGT基因第三外显子Leu84Phe多态性可能与吸烟、饮酒与食管癌的易感性之间存在协同作用。展开更多
基金Supported by the National Key Research&Development Projects of China under Grant Nos 2016YFA0202300 and 2018FYA0305800the National Natural Science Foundation of China under Grant Nos 61390501,61474141 and 11604373+1 种基金the CAS Pioneer Hundred Talents Programthe Strategic Priority Research Program of Chinese Academy of Sciences under Grant No XDB28000000
文摘We report on the formation of two-dimensional monolayer AgTe crystal on Ag(111)substrates.The samples are prepared in ultrahigh vacuum by deposition of Te on Ag(111)followed by annealing.Using a scanning tunneling microscope(STM)and low electron energy diffraction(LEED),we investigate the atomic structure of the samples.The STM images and the LEED pattern show that monolayer AgTe crystal is formed on Ag(111).Four kinds of atomic structures of AgTe and Ag(111)are observed:(i)flat honeycomb structure,(ii)bulked honeycomb,(iii)stripe structure,(iv)hexagonal structure.The structural analysis indicates that the formation of the different atomic structures is due to the lattice mismatch and relief of the intrinsic strain in the AgTe layer.Our results provide a simple and convenient method to produce monolayer AgTe atomic crystal on Ag(111)and a template for study of novel physical properties and for future quantum devices.
基金This project was supported by the Ministry of Science and Technology(MOST)of China(No.2016YFA0200700)the National Natural Science Foundation of China(NSFC)(Nos.61674045 and 61911540074)+2 种基金the Strategic Priority Research Program and Key Research Program of Frontier Sciences(Chinese Academy of Sciences,CAS)(Nos.XDB30000000 and QYZDB-SSW-SYS031)Grant-in-Aid for Scientific Research from Japan Society for the Promotion of Science(JSPS)from the Ministry of Education,Culture,Sports,Science,and Technology of Japan(Nos.JP16H06327,JP16H06504,JP17H01061,and JP17H010610)Osaka University’s International Joint Research Promotion Program(Nos.J171013014,J171013007,J181013006,and Ja19990011).Z.H.C.was supported by the Fundamental Research Funds for the Central Universities and the Research Funds of Renmin University of China(No.21XNLG27).
文摘Transition-metal chalcogenides(TMCs)materials have attracted increasing interest both for fundamental research and industrial applications.Among all these materials,two-dimensional(2D)compounds with honeycomb-like structure possess exotic electronic structures.Here,we report a systematic study of TMC monolayer AgTe fabricated by direct depositing Te on the surface of Ag(111)and annealing.Few intrinsic defects are observed and studied by scanning tunneling microscopy,indicating that there are two kinds of AgTe domains and they can form gliding twin-boundary.Then,the monolayer AgTe can serve as the template for the following growth of Te film.Meanwhile,some Te atoms are observed in the form of chains on the top of the bottom Te film.Our findings in this work might provide insightful guide for the epitaxial growth of 2D materials for study of novel physical properties and for future quantum devices.
文摘目的：探讨DNA损伤修复酶基因XRCC1Arg194Trp多态性和AGT基因第三外显子Leu84Phe多态性与食管癌易感性的关系。方法：采用病例-对照研究方法分析四川北部地区食管癌病例（n=155）和年龄、性别分布无差异的对照组（n=127）XRCC1基因Arg194Trp多态性和AGT基因第三外显子Leu84Phe多态性,两个基因多态的交互作用和基因多态与吸烟、饮酒之间的交互作用对食管癌易感性的影响。结果：XRCC1基因194位点各基因型在两组间的分布无统计学差异（χ~2=0.614;P=0.736）。AGT基因第三外显子第84位密码子各基因型在两组间的分布无统计学差异（χ~2=1.826;P=0.177）,吸烟、饮酒与AGT基因第三外显子第84位密码子突变基因型TT存在正交互作用,交互作用指数（the synergy index S,S）分别为7.375、17.67。结论：四川北部地区XRCC1基因194位点基因多态性与AGT基因第三外显子Leu84Phe多态性可能与食管癌的易感性无关,但AGT基因第三外显子Leu84Phe多态性可能与吸烟、饮酒与食管癌的易感性之间存在协同作用。
