Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 45: Perovskite and Photovoltaics II (joint session HL/KFM)
HL 45.5: Vortrag
Donnerstag, 20. März 2025, 10:30–10:45, H13
THz-Driven Phonon Fingerprints of Hidden Symmetry Breaking in 2D Layered Hybrid Perovskites — •Joanna M. Urban1, Michael S. Spencer1, Maximilian Frenzel1, Gaëlle Trippé- Allard2, Marie Cherasse1,3, Charlotte Berrezueta Palacios4, Olga Minakova1, Luca Perfetti3, Stephanie Reich4, Martin Wolf1, Emmanuelle Deleporte2, and Sebastian F. Maehrlein1,5,6 — 1FHI Berlin — 2LuMIn, Université Paris-Saclay, ENS Paris-Saclay, CentraleSupélec, CNRS — 3LSI, CEA/DRF/IRAMIS, CNRS, École Polytechnique, Institut Polytechnique de Paris — 4FU Berlin — 5HZDR — 6TU Dresden
Metal halide perovskites (MHPs) are emerging as promising candidates for spintronic applications. In MHPs which lack inversion symmetry, strong spin-orbit coupling induces the Rashba-Dresselhaus effect, allowing spin current control. Here we use intense THz fields to coherently drive lattice dynamics in Ruddlesden-Popper 2D layered perovskites. We identify simultaneous IR and Raman activity of specific inorganic cage modes, suggesting the presence of inversion symmetry breaking despite the globally centrosymmetric crystal structure. By exploring the driving pathways of coherent phonons bearing the signatures of broken inversion symmetry, we lay the groundwork for simultaneous ultrafast control of optoelectronic and spintronic properties in 2D MHPs.
Keywords: Coherent phonons; THz-induced Kerr effect; 2D layered perovskites; Lattice dynamics; Inversion symmetry breaking