Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 57: Ultrafast Electron Dynamics I
O 57.3: Hauptvortrag
Mittwoch, 19. März 2025, 11:00–11:30, H2
Floquet engineering in black phosphorus — •Changhua Bao1,2, Shaohua Zhou2, Benshu Fan2, Michael Schüler3, Teng Xiao2, Hui Zhou4, Zhiyuan Sun2, Peizhe Tang5, Sheng Meng4, Wenhui Duan2, and Shuyun Zhou2 — 1Department of Physics, University of Regensburg, Regensburg, Germany — 2Department of Physics, Tsinghua University, Beijing, China — 3Laboratory for Materials Simulations, Paul Scherrer Institute, Switzerland — 4Institute of Physics, Chinese Academy of Sciences, Beijing, China — 5School of Materials Science and Engineering, Beihang University, Beijing, China
The time-periodic light field has emerged as a control knob for manipulating quantum states in solid-state materials, dubbed as Floquet engineering. In this talk, I will present our progress on the experimental realization of Floquet band engineering in a model semiconductor, black phosphorus. Driven by strong mid-infrared light fields, transient gap opening and band renormalization are directly resolved with exotic pseudospin selectivity. In addition to band-structure engineering, manipulation of symmetry properties through Floquet engineering is also explored, including ultrafast glide-mirror symmetry breaking and parity symmetry manipulation. This series of works provides a comprehensive understanding of Floquet engineering in semiconductors and important guidance for extending Floquet engineering into more materials.
Nat. Rev. Phys. 4, 33 (2022); Nature 614, 75 (2023); PRL 131, 116401 (2023); ACS Nano 18, 32038 (2024); Nat. Commun. in press
Keywords: Floquet engineering; Black phosphorus; Time-resolved ARPES