Time-resolved photoemission spectroscopy of quantum materials using high harmonic generation: probing electron-phonon interactions and non-equilibrium dynamics

Abstract

Recent advancements in ultrafast laser systems and high harmonic generation (HHG) techniques have enabled time-resolved photoemission spectroscopy on femtosecond timescales, opening up unprecedented opportunities to explore quantum materials in both time and momentum space. In this review, we present recent representative studies utilizing HHG-laser-based time- and angle resolved photoemission spectroscopy for a variety of quantum materials. We particularly highlight electron–phonon interactions and non-equilibrium dynamics in time and frequency domain, through which rich information about non-equilibrium electron–phonon couplings and related phenomena has been clearly revealed.