Time-periodic light-field can dress the electronic states of quantum materials, providing a fascinating controlling knob for transient modifications of the electronic structure with light-induced emergent phenomena [1]. In this talk, I will present our recent experimental progress on the Floquet engineering of quantum materials using time- and angle-resolved photoemission spectroscopy (TrARPES). In particular, experimental progress from black phosphorus upon resonance pumping [2] and below-gap (non-resonance) pumping [3] will be presented, from which experiments insights about Floquet engineering will be discussed. I will also present more recent experimental results to demonstrate how the symmetry of the photon-electron hybrid system can also be manipulated by the pumping light-field [4]. 

[1] Changhao Bao et al., Nat. Rev. Phys. 4, 33 (2022) 

[2] Shaohua Zhou et al., Nature 614, 75 (2023) 

[3] Shaohua Zhou et al., Phys. Rev. Lett. 131, 11640 (2023)  

[4] Changhua Bao et al., Nat. Commun. in press (2024)