具有微米级空间分辨率和三维自旋矢量检测功能的基于激光的角分辨光电子能谱。

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

作者信息

Iwata Takuma, Kousa T, Nishioka Y, Ohwada K, Sumida K, Annese E, Kakoki M, Kuroda Kenta, Iwasawa H, Arita M, Kumar S, Kimura A, Miyamoto K, Okuda T

机构信息

Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan.

International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, Higashi-hiroshima, 739-8526, Japan.

出版信息

Sci Rep. 2024 Jan 4;14(1):127. doi: 10.1038/s41598-023-47719-z.

DOI:10.1038/s41598-023-47719-z

PMID:38177136

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10766951/

Abstract

We have developed a state-of-the-art apparatus for laser-based spin- and angle-resolved photoemission spectroscopy with micrometer spatial resolution (µ-SARPES). This equipment is realized by 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 µm. This enables us to probe both spatially-resolved electronic structures and vector information of spin polarization in three dimensions. The performance of µ-SARPES apparatus is demonstrated by presenting ARPES and SARPES results from topological insulators and Au photolithography patterns on a Si (001) substrate.

摘要

我们开发了一种先进的基于激光的具有微米级空间分辨率的自旋和角分辨光电子能谱仪（µ-SARPES）。该设备由高分辨率光电子能谱仪、光子通量高且聚焦至几微米的6 eV激光器、高精度样品台控制系统以及双极低能量电子衍射自旋探测器组合而成。该装置在无（有）自旋检测模式下的能量分辨率分别为1.5（5.5）meV，空间分辨率优于10 µm。这使我们能够在三维空间中探测空间分辨的电子结构和自旋极化的矢量信息。通过展示拓扑绝缘体和Si（001）衬底上的Au光刻图案的ARPES和SARPES结果，证明了µ-SARPES仪器的性能。