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We present a dry pick-and-flip assembly technique for angle-resolved photoemission spectroscopy (ARPES) of van der Waals heterostructures. By combining Elvacite2552C acrylic resin and 1-ethyl-3-methylimidazolium ionic liquid, we prepared polymers with glass transition temperatures (Tg) ranging from 37 to 100 °C. The adhesion of the polymer to the 2D crystals was enhanced at 𝑻𝐠. By utilizing the difference in 𝑻𝐠, a 2D heterostructure can be transferred from a high-𝑻𝐠 polymer to a lower-𝑻𝐠 polymer, which enables flipping its surface upside down. This process is suitable for assembling heterostructures for ARPES, where the top capping layer should be monolayer graphene. The laser-based micro-focused ARPES measurements of 5-layer WTe2, 3-layer MoTe2, 2-layer WTe2/few-layer Cr2Ge2Te6, and twisted double bilayer WTe2 demonstrate that this process can be utilized as a versatile sample fabrication method for investigating the energy spectra of 2D heterostructures.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Photoemission spectroscopy, van der Waals heterostructures, sample fabrica

刊行年月日: 2022-06-29

出版者: Springer Science and Business Media LLC

掲載誌:

• Scientific Reports (ISSN: 20452322) vol. 12 issue. 1 10936

研究助成金:

• Japan Society for the Promotion of Science JP19H01820
• Japan Society for the Promotion of Science JP21K05235
• Japan Society for the Promotion of Science JP21H05233
• Japan Society for the Promotion of Science JP21H05236
• Japan Society for the Promotion of Science JP20H00127
• Core Research for Evolutional Science and Technology JPMJCR16F2
• Core Research for Evolutional Science and Technology JPMJCR15F3
• JST-Mirai Program JPMJMI21G9

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41598-022-14845-z

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更新時刻: 2025-02-28 16:31:09 +0900

MDRでの公開時刻: 2025-02-28 16:31:09 +0900