Atomic-scale compensation phenomena at polar interfaces

Details Atomic-scale compensation phenomena at polar interfaces Atomic-scale compensation phenomena at polar interfaces

2010-10-26

arxiv.org/abs/1010.5517v1

Physics

Condensed Matter

Materials Science

3 figures

Scientific paper

The interfacial screening charge that arises to compensate electric fields of dielectric or ferroelectric thin films is now recognized as the most important factor in determining the capacitance or polarization of ultrathin ferroelectrics. Here we investigate using aberration-corrected electron microscopy and density functional theory how interfaces cope with the need to terminate ferroelectric polarization. In one case, we show evidence for ionic screening, which has been predicted by theory but never observed. For a ferroelectric film on an insulating substrate, we found that compensation can be mediated by interfacial charge generated, for example, by oxygen vacancies.

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