Purely in-plane ferroelectricity in monolayer SnS at room temperature

Naoki Higashitarumizu, Hayami Kawamoto, Chien Ju Lee, Bo Han Lin, Fu Hsien Chu, Itsuki Yonemori, Tomonori Nishimura, Katsunori Wakabayashi, Wen Hao Chang, Kosuke Nagashio*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


2D van der Waals ferroelectrics have emerged as an attractive building block with immense potential to provide multifunctionality in nanoelectronics. Although several accomplishments have been reported in ferroelectric switching for out-of-plane ferroelectrics down to the monolayer, a purely in-plane ferroelectric has not been experimentally validated at the monolayer thickness. Herein, an in-plane ferroelectricity is demonstrated for micrometer-size monolayer SnS at room temperature. SnS has been commonly regarded to exhibit the odd–even effect, where the centrosymmetry breaks only in the odd-number layers to exhibit ferroelectricity. Remarkably, however, a robust room temperature ferroelectricity exists in SnS below a critical thickness of 15 layers with both an odd and even number of layers, suggesting the possibility of controlling the stacking sequence of multilayer SnS beyond the limit of ferroelectricity in the monolayer. This work will pave the way for nanoscale ferroelectric applications based on SnS as a platform for in-plane ferroelectrics.

Original languageEnglish
Article number2428
Pages (from-to)1-9
Number of pages9
JournalNature Communications
Issue number1
StatePublished - 15 May 2020

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