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説明:

In twisted layered materials (t-LMs), an inter-layer rotation can break inversion symmetry and create an interfacial array of staggered out-of-plane polarization due to AB/BA stacking registries. This symmetry breaking can also trigger the formation of edge in-plane polarizations localized along the perimeter of AB/BA regions (i.e., saddle point domains). However, a comprehensive experimental investigation of these features is still lacking. Here, we use piezo force microscopy to probe the electromechanical behavior of twisted hexagonal boron nitride (t-hBN). For parallel stacking alignment of t-hBN, we reveal very narrow (width ~ 10 nm) saddle point in-plane polarizations, which we also measure in the anti-parallel configuration. These localized polarizations can still be found on a multiply stacked t-hBN structure, determining the formation of a double moiré. Our findings imply that polarizations in t-hBN do not only point in the out-of-plane direction but also show an in-plane component, giving rise to a much more complex 3D polarization field.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: twisted hBN
, moiré superlattices, piezo force microscopy


刊行年月日: 2025-05-06

出版者: American Chemical Society (ACS)

掲載誌:

• ACS Nano (ISSN: 19360851) vol. 19 issue. 17 p. 16297-16306

研究助成金:

• Engineering and Physical Sciences Research Council EP/K01711X/1
• Engineering and Physical Sciences Research Council EP/K017144/1
• Engineering and Physical Sciences Research Council EP/L016087/1
• Engineering and Physical Sciences Research Council EP/N010345/1
• Engineering and Physical Sciences Research Council EP/V000055/1
• Engineering and Physical Sciences Research Council EP/X015742/1
• European Research Council 817794
• Fondazione Cariplo 2019-3923
• Graphene Flagship

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acsnano.4c12315

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更新時刻: 2026-02-17 12:30:06 +0900

MDRでの公開時刻: 2026-02-17 09:10:58 +0900