High-resolution three-dimensional spin- and angle-resolved photoelectron spectrometer using vacuum ultraviolet laser light

• Published in: arXiv.org 2016-04
• Main Authors: Yaji, Koichiro, Harasawa, Ayumi, Kuroda, Kenta, Toyohisa, Sogen, Nakayama, Mitsuhiro, Ishida, Yukiaki, Fukushima, Akiko, Watanabe, Shuntaro, Chen, Chuangtian, Komori, Fumio, Shin, Shik
• Format: Article
• Language: English
• Subjects: Electron spin; Electron states; Energy resolution; Lasers; Photoelectrons; Solid state physics; Ultraviolet lasers
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1604.06521

We describe a spin- and angle-resolved photoelectron spectroscopy (SARPES) apparatus with a vacuum-ultraviolet (VUV) laser (\(h\nu\)= 6.994 eV) developed at the Laser and Synchrotron Research Center at the Institute for Solid State Physics, The University of Tokyo. The spectrometer consists of a hemispherical photoelectron analyzer equipped with an electron deflector function and twin very-low-energy-electron-diffraction-type spin detectors, which allows us to analyze the spin vector of a photoelectron three-dimensionally with both high energy and angular resolutions. The combination of the high-performance spectrometer and the high-photon-flux VUV laser can achieve an energy resolution of 1.7 meV for SARPES. We demonstrate that the present laser-SARPES machine realizes a quick SARPES on the spin-split band structure of a Bi(111) film even with 7 meV energy and 0.7\(^\circ\) angular resolutions along the entrance-slit direction. This laser-SARPES machine is applicable to the investigation of spin-dependent electronic states on an energy scale of a few meV.