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

マイクロメートルの空間分解能と三次元スピンベクトルの検出を可能にするレーザーベースの角度分解光電子分光法

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*; Kumar, S.*; 木村 昭夫*; 宮本 幸治*; 奥田 太一*

Iwata, Takuma*; Kosa, Towa*; Nishioka, Yukimi*; Owada, Kiyotaka*; Sumida, Kazuki; Annese, E.*; Kakoki, Masaaki*; Kuroda, Kenta*; Iwasawa, Hideaki*; Arita, Masashi*; Kumar, S.*; Kimura, Akio*; Miyamoto, Koji*; Okuda, Taichi*

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.