HHG-laser-based time- and angle-resolved photoemission spectroscopy of quantum materials

TL;DR

This paper reviews the use of high-harmonic-generation laser-based time- and angle-resolved photoemission spectroscopy to explore non-equilibrium electronic structures in quantum materials, revealing new phenomena with high temporal and momentum resolution.

Contribution

It introduces recent advancements in HHG-laser-based TR-ARPES techniques and demonstrates their application to uncover novel electronic phenomena in quantum materials.

Findings

Unveiled unprecedented electronic phenomena in quantum materials

Achieved sub-100 fs time resolution in photoemission studies

Extended the accessible Brillouin zone using high photon energies

Abstract

Time- and angle-resolved photoemission spectroscopy has played an important role in revealing the non-equilibrium electronic structures of solid-state materials. The implementation of high harmonic generation to obtain a higher photon energy also allows us to investigate the wide Brillouin zone on a time scale below 100 fs. In this article, we review our recent studies using high-harmonic-generation-laser-based time- and angle-resolved photoemission spectroscopy to study a variety of quantum materials. We reveal many unprecedented phenomena in each system and highlight some representative results.