Spin-Dependent Exciton–Exciton Interactions in a Mixed Lead Halide Perovskite Crystal
Stefan Grisard,
Artur V. Trifonov,
Thilo Hahn
et al.
Abstract:We
investigate the two-pulse photon echo response of
excitons in
the mixed lead halide perovskite crystal FA0.9Cs0.1PbI2.8Br0.2 in dependence on the excitation
intensity and polarization of the incident laser pulses. Using spectrally
narrow picosecond laser pulses, we address localized excitons with
long coherence times T
2 ≈ 100 ps.
This approach offers high sensitivity for the observation of excitation-induced
changes in the homogeneous line width Γ2 = 2ℏ/T
2 on the μeV
scale. Through intensity-dependent mea… Show more
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