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

【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 TiTe₂, on a Au（111） surface by molecular beam epitaxy（MBE）. Low-energy electron diffraction（LEED） measurements of the samples indicate that the TiTe₂ 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-TiTe₂ 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.更多还原

【Abstract】 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 TiTe₂, on a Au（111） surface by molecular beam epitaxy（MBE）. Low-energy electron diffraction（LEED） measurements of the samples indicate that the TiTe₂ 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-TiTe₂ 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.更多还原