Hybrid improper ferroelectricity in (PA)2FAPb2I7 induces ~5.17° layer misalignment creating a moiré superlattice that quantizes excitons into an equidistant photoluminescence ladder at 123 K.
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cond-mat.mtrl-sci 2years
2026 2verdicts
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Photo-excited optical phonons in BPO4 generate strain-free macroscopic electrical polarization via phonon rectification at light-speed timescales, exceeding strain-limited piezoelectric amplitudes.
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Hybrid Improper Ferroelectricity and Moir\'e Superlattices-induced Exciton Quantization in Layered 2D Halide Perovskite
Hybrid improper ferroelectricity in (PA)2FAPb2I7 induces ~5.17° layer misalignment creating a moiré superlattice that quantizes excitons into an equidistant photoluminescence ladder at 123 K.
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The optical phonoelectric effect
Photo-excited optical phonons in BPO4 generate strain-free macroscopic electrical polarization via phonon rectification at light-speed timescales, exceeding strain-limited piezoelectric amplitudes.