Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy

TL;DR

This paper reviews how angle-resolved photoemission spectroscopy (ARPES) has advanced our understanding of quantum materials by providing detailed insights into their electronic structures, especially in strongly-correlated and topological states.

Contribution

It provides a comprehensive overview of recent developments in ARPES technology and its application to studying quantum materials, highlighting new capabilities and scientific insights.

Findings

ARPES has become more precise and versatile over two decades.

New material synthesis and in-situ tuning expand ARPES applications.

ARPES has significantly contributed to understanding topological and correlated states.

Abstract

The physics of quantum materials is dictated by many-body interactions and mathematical concepts such as symmetry and topology that have transformed our understanding of matter. Angle-resolved photoemission spectroscopy (ARPES), which directly probes the electronic structure in momentum space, has played a central role in the discovery, characterization, and understanding of quantum materials ranging from strongly-correlated states of matter to those exhibiting non-trivial topology. Over the past two decades, ARPES as a technique has matured dramatically with ever-improving resolution and continued expansion into the space-, time-, and spin-domains. Simultaneously, the capability to synthesize new materials and apply non-thermal tuning parameters \emph{in-situ} has unlocked new dimensions in the study of all quantum materials. We review these developments, and survey the scientific contributions they have enabled in contemporary quantum materials research.