Epitaxial fabrication of two-dimensional TiTe2 monolayer on Au(111) substrate with Te as buffer layer

• 来源期刊: 中国物理B（英文版）
• 关键词: TiTe2 epitaxial fabrication superlattice scanning tunneling microscopy (STM) low-energy elec-tron diffraction (LEED)
• 年，卷（期）: 2019,（5）
• 页码范围: 18-22
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/5/056801

摘要

Two-dimensional (2D) materials provide a platform to exploit the novel physical properties of functional nanodevices. Here, we report on the formation of a new 2D layered material, a well-ordered monolayer TiTe2, on a Au(111) surface by molecular beam epitaxy (MBE). Low-energy electron diffraction (LEED) measurements of the samples indicate that theTiTe2 film forms (√3 ×√7) superlattice with respect to the Au(111) substrate, which has three different orientations. Scan-ning tunneling microscopy (STM) measurements clearly show three ordered domains consistent with the LEED patterns. Density functional theory (DFT) calculations further confirm the formation of 2H-TiTe2 monolayer on the Au(111) surface with Te as buffer layer. The fabrication of this 2D layered heterostructure expands 2D material database, which may bring new physical properties for future applications.