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Photoinduced Domain Pattern Transformation in Ferroelectric/Dielectric Superlattices

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arxiv 1705.01846 v2 pith:3DTSTJYX submitted 2017-05-04 cond-mat.mtrl-sci

Youngjun Ahn , Joonkyu Park , Anastasios Pateras , Matthew B. Rich , Qingteng Zhang , Pice Chen , Mohammed H. Yusuf , Haidan Wen
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Matthew Dawber Paul G. Evans
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classification cond-mat.mtrl-sci
keywords domainpatterntransformationdielectricferroelectriclatticescatteringsuperlattices
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The nanodomain pattern in ferroelectric/dielectric superlattices transforms to a uniform polarization state under above-bandgap optical excitation. X-ray scattering reveals a disappearance of domain diffuse scattering and an expansion of the lattice. The reappearance of the domain pattern occurs over a period of seconds at room temperature, suggesting a transformation mechanism in which charge carriers in long-lived trap states screen the depolarization field. A Landau-Ginzburg-Devonshire model predicts changes in lattice parameter and a critical carrier concentration for the transformation.

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