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I was wonderimg if this was expected and the answer is yes. It was predicted 80 years ago. Here's another article with a simple explanation of it and its dual phenomenon:

https://phys.org/news/2018-10-validate-year-old-ferroelectri...

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If I get that right, a 1nm layer should behave more like an ideal material, rather that the average of several multi-nm hysterons.

It’s just 1nm in one direction, so you merely force the hysterons to lie along the plane.

They claim ferroelectricity, not a new form of ferroelectricity, presumably this means the old theory applies.

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