Photo-excited optical phonons in BPO4 generate strain-free macroscopic electrical polarization via phonon rectification at light-speed timescales, exceeding strain-limited piezoelectric amplitudes.
The electrical polarization PC along the c axis, estimated by density functional theory (see Supplementary Information)
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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.