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HL: Fachverband Halbleiterphysik
HL 54: 2D Materials IX – Photonic properties and devices
HL 54.1: Vortrag
Freitag, 13. März 2026, 09:30–09:45, POT/0081
Signature of interference between second and fourth order nonlinearities in atomically thin crystals — •Paul Herrmann1, Jonas Margraf1, Sebastian Klimmer1, Sebastian Piehler2, Maximilian Graml2, Muhammad Sufyan Ramzan3, Caterina Cocchi3, Jan Wilhelm2, and Giancarlo Soavi1,4 — 1Institute of Solid State Physics, Friedrich Schiller University Jena, Jena, Germany — 2Institute of Theoretical Physics and Regensburg Center for Ultrafast Nanoscopy (RUN), University of Regensburg, Regensburg, Germany — 3Institute of Condensed Matter Theory and Optics, Friedrich Schiller University Jena, Jena, Germany — 4Abbe Center of Photonics, Friedrich Schiller University Jena, Jena, Germany
Transition metal dichalcogenides (TMDs) are a well studied class of two-dimensional materials, whose opto-electronic properties are dominated by excitons and exhibit strong light-matter interaction. The relaxed phase matching in TMD monolayers facilitates the emission of many orders of nonlinearities with approximately equal efficiency. Thus, one can in principle observe interference effects between nonlinearities of different orders N (N=2,3,4,...). Here, we observe a previously unseen modulation of the generated second harmonic upon rotation of the input fundamental polarization. By combining wavelength and power dependent measurements with macroscopic, symmetry-based calculations and microscopic density functional theory simulations, we can assign this modulation to an interference between second and fourth order terms of the nonlinear polarization.
Keywords: Nonlinear optics; TMDs; Two-dimensional materials; Interference