Nature CommunicationsRoom-temperature ferroelectricity in NaNbO3 membraneYunfan WangZihao ZhengLele RenYifeng DuJinming GuoShujun ZhangCe-Wen NanBao-Wen Li2026-06-17Full textDOI https://doi.org/10.1038/s41467-026-74642-4