研究目的
To understand the growth mode, chemical properties at the interface, and the variation of the topological surface state (TSS) of Au deposited on Bi2Se3 at different coverage regimes, as well as the stability and evolution of Au upon thermal treatment.
研究成果
Au deposited on Bi2Se3 at room temperature forms three-dimensional islands following the Volmer-Weber growth mode. The topological surface states are stable up to 45 ? coverage. A weak chemical interaction at the Au/Bi2Se3 interface results in Bi diffusion towards the surface of Au islands and limited chemical interaction between Au and Se. The system is inert towards CO and CO2 exposure under the investigated conditions.
研究不足
The study is limited to the characterization of Au on Bi2Se3 at room temperature and upon annealing up to 250°C. The reactivity towards CO and CO2 was tested only at low pressure (10-8 mbar) regime.
1：Experimental Design and Method Selection:
The study used Scanning Electron Microscopy (SEM), Scanning Tunneling Microscopy (STM), X-ray Photoelectron Spectroscopy (XPS), and Angle Resolved Photoemission Spectroscopy (ARPES) to characterize the growth mode, morphology, and electronic structure of Au on Bi2Se
2：Sample Selection and Data Sources:
Bi2Se3 single crystals were grown and cleaved in-situ in an ultra-high vacuum (UHV) system. Au was deposited on the cleaved surfaces at room temperature.
3：List of Experimental Equipment and Materials:
SEM (JEOL JSM 7100f), STM (Omicron VT-STM), XPS and ARPES at VUV Photoemission and BACH beamlines of Elettra Synchrotron, SCIENTA R4000 and SCIENTA R3000 electron analyzers.
4：Experimental Procedures and Operational Workflow:
Au was deposited on Bi2Se3 at room temperature, followed by annealing at 100°C and 250°C. The samples were characterized before and after annealing.
5：Data Analysis Methods:
XPS spectra were fitted with spin-orbit doublets using KolXPD software. SEM images were analyzed using ImageJ software.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
