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MO: Fachverband Molekülphysik
MO 8: Strong-Field and Ultrafast Phenomena (joint session Q/MO)
MO 8.1: Invited Talk
Tuesday, March 11, 2025, 11:00–11:30, HS V
Strong-field physics and nonlinear optical phenomena in two-dimensional honeycomb materials — •Anna Galler — Institute of Theoretical and Computational Physics, TU Graz, Austria
Strong-field physics and extreme nonlinear optical processes in solids have emerged as powerful tools for ultrafast spectroscopy of electron dynamics. Ultrashort intense laser pulses have also been used to control and probe the valley pseudospin in two-dimensional honeycomb materials like transition-metal dichalcogenides. These phenomena are governed by the material-specific electronic structure and the nature of light-matter interaction. In this talk, I will present how ab-initio calculations can provide insights into these processes. Specifically, I will explore the role of the Floquet light-driven electronic structure in nonlinear optical phenomena and demonstrate how valley polarization and photocurrents in monolayer hexagonal boron nitride can be controlled using elliptically polarized, ultrashort laser pulses. Additionally, I will address high-harmonic generation (HHG) in two-dimensional materials, focusing on how interference effects from HHG emissions at distinct k-points in the Brillouin zone explain spectral features like peak splitting in monolayer WS2. Finally, I will compare these simulation results with experimental observations to highlight the predictive power of our theoretical approach.
Keywords: nonlinear optics; 2D materials; Floquet physics; high-harmonic generation; ab-initio calculations