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

TL;DR

This paper presents a high-resolution 3D spin- and angle-resolved photoelectron spectrometer using a vacuum ultraviolet laser, enabling detailed analysis of spin-dependent electronic states with high precision.

Contribution

The development of a novel laser-SARPES apparatus with high energy and angular resolution, capable of three-dimensional spin analysis using VUV laser light.

Findings

Achieved an energy resolution of 1.7 meV for SARPES.

Demonstrated quick SARPES measurements on Bi(111) films.

Applicable to investigating spin states on a few meV energy scale.

Abstract

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.