Mainz 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: Poster (joint session K/Q)
K 4.7: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG
Probing High-Order Susceptibilities of monolayer MoS2 via High Harmonic Generation: TDDFT approach — •Yeganehsadat Alvankar1,2, Elnaz Irani2, Hamid Talkhabi1,2, and Mohammad Monfared3 — 13ICMM, Centro Superior de Investigaciones Cientficas, Sor Juana Ines de la Cruz, 3 Cantoblanco, 28049 Madrid, Spain — 2Department of Physics, Faculty of Basic Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran — 3Institute of Theoretical Physics, Leibniz University Hannover, Appelstraße 2, 30167 Hannover, Germany
High-harmonic generation (HHG) is a powerful method for probing high-order nonlinear optical responses in solids, across both perturbative and non-perturbative regimes.
Here, we use time-dependent density functional theory (TDDFT) to compute the nonlinear susceptibilities (χ(5), χ(7), χ(9)) of monolayer MoS2 via HHG. Simulations employ intense ultrafast laser pulses (λ0 = 600,nm) with peak intensities from 0.2-1.2 TW/cm2.
Our results exhibit power-law scaling YieldN = AN IN and interband polarization, enabling direct extraction of higher-order susceptibilities. We also observe strong crystal orientation dependence, with anisotropic behavior across harmonic orders, emphasizing the role of polarization control in 2D material characterization.
Unlike previous methods (e.g., attosecond streaking) that inferred lower-order susceptibilities indirectly, HHG directly reveals higher-orders responses without broad spectra or indirect analysis. Quantifying such nonlinearities is key to advancing ultrafast photonic.
Keywords: High Harmonic Generation; Nonlinear Optics; 2D materials; High-Order Susceptibilities