Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 43: Optical Properties II

HL 43.7: Vortrag

Donnerstag, 21. März 2024, 11:15–11:30, EW 561

Hyper-Raman effect on magnetic-field coupled 1S exciton polaritons in Cu₂O — •Gülistan Uca¹, Andreas Farenbruch¹, Dietmar Fröhlich¹, Heinrich Stolz², Dmitry Yakovlev¹, and Manfred Bayer¹ — ¹TU Dortmund, Dortmund, Germany — ²Universität Rostock, Rostock, Germany

We analyzed the polarization dependence of the hyper-Raman effect for magnetic field-coupled 1S exciton polaritons in cuprous oxide (Cu₂O), a material recently recognized for hosting Rydberg excitons with high principal quantum numbers. The hyper-Raman effect is a coherent process consisting of a two-photon excitation on the polariton branch and an emission of both a phonon and a photon. Characteristic polarization selection rules for this process are derived through group theoretical considerations. Applying this approach, the full polarization dependence of this process was simulated and measured for the hyper-Raman effect at a magnetic field of 10 T in Voigt configuration involving the Γ₃⁻ phonon. Further investigations focused on the hyper-Raman effect with a sideband emission involving the Γ₅⁻ phonon, as well as the longitudinal-transverse split Γ₄⁻ phonon mode.

Keywords: Hyper-Raman; Nonlinear optics; Phonon; Semiconductor; Coherence