Laser-based angle-resolved photoemission spectroscopy with micrometer spatial resolution and detection of three-dimensional spin vector

岩田 拓万*; 高佐 永遠*; 西岡 幸美*; 大和田 清貴*; 角田 一樹; Annese, E.*; 鹿子木 将明*; 黒田 健太*; 岩澤 英明*; 有田 将司*; et al.

Scientific Reports (Internet), 14, p.127_1 - 127_8, 2024/01

https://doi.org/10.1038/s41598-023-47719-z

We have developed a state-of-the-art apparatus for laser-based spin- and angle-resolved photoemission spectroscopy with micrometer spatial resolution (-SARPES). This equipment is achieved through the combination of a high-resolution photoelectron spectrometer, a 6-eV laser with high photon flux that is focused down to a few micrometers, a high-precision sample stage control system, and a double very-low-energy-electron-diffraction spin detector. The setup achieves an energy resolution of 1.5 (5.5) meV without (with) the spin detection mode, compatible with a spatial resolution better than 10 m. This enables us to probe both spatially-resolved electronic structures and vector information of spin polarization in three dimensions. The performance of -SARPES apparatus is demonstrated by presenting ARPES and SARPES results from topological insulators and Au photolithography patterns on a Si (001) substrate.