Spin and Angle-resolved Photoemission Spectroscopy

The band structure of electrons is key to understanding various properties of solids. Angle-resolved photoemission spectroscopy (ARPES) is a powerful technique, which can not only directly measure the electronic band structure but also provide useful information on the quantum phase and many-body interactions. With additional spin detectors, ARPES is capable of additionally probing spin information in the electronic band structure, which is called spin-resolved ARPES. This article introduces the basic concept of spin-resolved APRES and briefly discusses the on-going project of spin-resolved ARPES at the Pohang Light Source and its potential application to the study of spin-split materials, such as topological insulators.