ArticleScience advances2026
Emergence of unconventional ferroelectric phase in ultrathin Hf
Article in Science advances, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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15 authors.
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Abstract
Unlike perovskite-based ferroelectrics, whose polarization typically diminishes at reduced thickness, doped hafnia films retain robust ferroelectricity down to 1-nanometer thickness. Accurate structural determination is crucial for understanding this behavior, as ferroelectricity in ultrathin hafnia-based films has been attributed to enhanced polar distortion in their crystal structures. However, precise identification is challenging because of structural similarities among various polymorphs. Here, we experimentally identify the emergence of an unconventional ferroelectric Pmn2
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