Epitaxial fabrication of two-dimensional TiTe_2 monolayer onAu(111) substrate with Te as buffer layer  

作　　者：Zhipeng Song Bao Lei Yun Cao Jing Qi Hao Peng Qin Wang Li Huang Hongliang Lu Xiao Lin Ye-Liang Wang Shixuan Du Hong-Jun Gao 宋志朋;雷宝;曹云;戚竞;彭浩;汪琴;黄立;路红亮;林晓;王业亮;杜世萱;高鸿钧(Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences;CAS Center for Excellence in Topological Quantum Computation;School of Information and Electronics, Beijing Institute of Technology)

机构地区：[1]Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences [2]CAS Center for Excellence in Topological Quantum Computation [3]School of Information and Electronics, Beijing Institute of Technology

出　　处：《Chinese Physics B》2019年第5期16-19,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 2018YFA0305800);the National Natural Science Foundation of China(Grant Nos.61504149,61725107,51572290,and 61622116);the Strategic Priority Research Program of Chinese Academy of Sciences(Grant Nos.XDB30000000 and XDB28000000);the University of Chinese Academy of Sciences;the CAS Key Laboratory of Vacuum Physics

摘　　要：Two-dimensional(2 D) materials provide a platform to exploit the novel physical properties of functional nanodevices.Here, we report on the formation of a new 2 D layered material, a well-ordered monolayer TiTe_2, on a Au(111) surface by molecular beam epitaxy(MBE). Low-energy electron diffraction(LEED) measurements of the samples indicate that the TiTe_2 film forms(√3 ×√7) superlattice with respect to the Au(111) substrate, which has three different orientations. Scanning tunneling microscopy(STM) measurements clearly show three ordered domains consistent with the LEED patterns.Density functional theory(DFT) calculations further confirm the formation of 2 H-TiTe_2 monolayer on the Au(111) surface with Te as buffer layer. The fabrication of this 2 D layered heterostructure expands 2 D material database, which may bring new physical properties for future applications.Two-dimensional(2 D) materials provide a platform to exploit the novel physical properties of functional nanodevices.Here, we report on the formation of a new 2 D layered material, a well-ordered monolayer TiTe_2, on a Au(111) surface by molecular beam epitaxy(MBE). Low-energy electron diffraction(LEED) measurements of the samples indicate that the TiTe_2 film forms(√3 ×√7) superlattice with respect to the Au(111) substrate, which has three different orientations. Scanning tunneling microscopy(STM) measurements clearly show three ordered domains consistent with the LEED patterns.Density functional theory(DFT) calculations further confirm the formation of 2 H-TiTe_2 monolayer on the Au(111) surface with Te as buffer layer. The fabrication of this 2 D layered heterostructure expands 2 D material database, which may bring new physical properties for future applications.

关 键 词：TiTe2 EPITAXIAL FABRICATION SUPERLATTICE scanning tunneling microscopy (STM) LOW-ENERGY electron diffraction (LEED) 

分 类 号：O4[理学—物理]