Floquet Engineering of Black Phosphorus

Speaker: Shuyun Zhou

Program Description
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)

Biography
Shuyun Zhou is a professor of Physics at Tsinghua University. She received her Ph.D. in physics from University of California, Berkeley in 2007, and worked as a postdoc and project scientist at Lawrence Berkeley National Laboratory before she joined the Department of Physics at Tsinghua University in 2012. Her research focuses on the electronic structure and ultrafast dynamics of low-dimensional materials and heterostructures. Her recognitions include the XPLORER PRIZE on fundamental science and research, Kun Huang Physics Prize, L’Oreal-UNESCO Award for Women in Science China. She serves as associate Department Chair of Physics at Tsinghua University, and Member of Commission on Structure and Dynamics of Condensed Matter, International Union of Pure and Applied Physics (IUPAP).