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arXiv · 1905.10321

Erratum: Photovoltage from ferroelectric domain walls in BiFeO$_3$

Sabine Körbel·Stefano Sanvito
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Abstract

In the original article a mistake in the methodology lead to an incorrect prediction of exciton delocalization below a critical exciton density. This unrealistic delocalized exciton state yielded a sizable domain-wall photovoltage. When done correctly, the simulations yield self-trapped (localized) excitons at all considered exciton densities, without any evidence for a transition to a delocalized exciton. This realistic self-trapped exciton state yields only a negligible domain-wall photovoltage. The original conclusion that ferroelectric domain walls could be responsible for the measured photovoltage if carrier lifetime and diffusion length are higher than expected is incorrect. Correct is: The domain-wall photovoltage in BiFeO3 is much too small to explain the measured photovoltage. The original analysis is meaningful for ferroelectrics without carrier self-trapping, not for BiFeO3.

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Sabine Körbel, Stefano Sanvito. 2019-05-24. Erratum: Photovoltage from ferroelectric domain walls in BiFeO$_3$. https://doi.org/10.1103/physrevb.102.081304%2010.1103%2Fphysrevb.110.039902

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