研究目的
Investigating the atomic and electronic structure of the (√3×√3)R30? SnAu2/Au(111) surface alloy to understand the Rashba-type spin splitting and its origin.
研究成果
The study reveals that the Rashba-type spin splitting of the hole-like Sn-Au hybrid surface state is caused by the significant mixing of Au d with Sn s states in conjunction with the strong atomic spin-orbit coupling of Au. The findings demonstrate that a Rashba-type spin splitting of hybrid surface states of binary surface alloys can also be induced solely by the strong SOC of the substrate material.
研究不足
The herringbone reconstruction of the Au(111) surface could not be considered in the DFT calculations due to its large unit cell and the correspondingly extremely large number of atoms per unit cell. The study focuses on the SnAu2 surface alloy on Au(111), and the findings may not be directly applicable to other surface alloys or substrates.
1：Experimental Design and Method Selection:
The study combines low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), angle-resolved photoemission spectroscopy (ARPES), and two-photon photoemission spectroscopy (AR-2PPE) techniques with density functional theory (DFT) calculations.
2：Sample Selection and Data Sources:
The Au(111) surface was prepared by repeated sputtering and annealing cycles. Sn was deposited onto the clean surface at an elevated sample temperature.
3：List of Experimental Equipment and Materials:
Specs 150 hemispherical analyzer, He I light sources, fourth harmonic of a Ti:Sa laser (
4：9 eV), chemically etched and in situ sputter-annealed tungsten tip for STM. Experimental Procedures and Operational Workflow:
LEED and STM measurements were performed to confirm the formation of the surface alloy. ARPES and AR-2PPE were used to investigate the electronic structure.
5：Data Analysis Methods:
The experimental results were compared with DFT calculations to analyze the band structure and spin splitting.
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