Physics Department - Floquet Engineering of Quantum Materials

Abstract
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 on the Floquet engineering of black phosphorus [2-6] and topological insulator [7,8] will be presented. I will also provide some experimental insights on Floquet engineering and light-matter interactions in quantum materials.

References
[1] “Light-induced emergent phenomena in 2D materials and topological materials”, Nat. Rev. Phys. 4, 33 (2022)
[2] “Pseudospin-selective Floquet band engineering in black phosphorus”, Nature 614, 75 (2023)
[3] “Floquet engineering of black phosphorus upon below-gap pumping”, Phys. Rev. Lett. 131, 116401 (2023)
[4] “Manipulating the symmetry of photon-dressed electronic states”, Nat. Commun. 15, 10533 (2024)
[5] “Light-induced ultrafast glide-mirror symmetry breaking in black phosphorus”, ACS Nano 18, 32038 (2024)
[6] “Floquet-Volkov interference in a semiconductor”, Phys. Rev. B 111, L081106 (2025)
[7] “Light-field dressing of transient photo-excited states in Bi2Te3”, Phys. Rev. Lett. in press (2025)
[8] “Distinct light-matter couplings in Bi2Te3: crossover from above-gap photo-excitation to light-field dressing”, Phys. Rev. B 110, L201116 (2024)