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説明:

New properties can arise at van der Waals (vdW) interfaces hosting a moiré pattern generated by interlayer twist and strain. However, achieving precise control of interlayer twist/strain remains an ongoing challenge in vdW heterostructure assembly, and even subtle variation in these structural parameters can create significant changes in the moiré period and emergent properties. Characterizing the rate of interlayer twist/strain relaxation during thermal annealing is critical to establish a thermal budget for vdW heterostructure construction and may provide a route to improve the homogeneity of the interface or to control its final state. Here, we characterize the spatial and temporal dependence of interfacial twist and strain relaxation in marginally-twisted hBN/hBN interfaces heated under conditions relevant to vdW heterostructure assembly and typical sample annealing. We find that the ferroelectric hBN/hBN moiré relaxes minimally during annealing in air at typical assembly temperatures of 170oC. However, at 400°C, twist angle relaxes significantly, accompanied by a decrease in spatial uniformity. Uniaxial heterostrain initially increases and then decreases over time, becoming increasingly non-uniform in direction. Structural irregularities such as step edges, contamination bubbles, or contact with the underlying substrate result in local inhomogeneity in the rate of relaxation

権利情報:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

キーワード: van der Waals interfaces, moiré pattern, thermal annealing

刊行年月日: 2024-07-14

出版者: AIP Publishing

掲載誌:

• Journal of Applied Physics (ISSN: 00218979) vol. 136 issue. 2

研究助成金:

• U.S. Department of Energy DE-AC02-76SF00515
• U.S. Department of Energy DE-SC0021984
• National Science Foundation DMR- 2018008
• National Science Foundation ECCS-2026822
• National Science Foundation ECCS-1542152
• SLAC National Accelerator Laboratory Q-BALMS LDRD
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1063/5.0210112

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更新時刻: 2025-02-06 12:30:56 +0900

MDRでの公開時刻: 2025-02-06 12:30:56 +0900