論文

2022年6月29日

Dry pick-and-flip assembly of van der Waals heterostructures for microfocus angle-resolved photoemission spectroscopy

Scientific Reports
  • Satoru Masubuchi
  • Masato Sakano
  • Yuma Tanaka
  • Yusai Wakafuji
  • Takato Yamamoto
  • Shota Okazaki
  • Kenji Watanabe
  • Takashi Taniguchi
  • Jincai Li
  • Hirotaka Ejima
  • Takao Sasagawa
  • Kyoko Ishizaka
  • Tomoki Machida
  • 全て表示

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記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1038/s41598-022-14845-z
出版者・発行元
Springer Science and Business Media {LLC}

<jats:title>Abstract</jats:title><jats:p>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 (<jats:italic>T</jats:italic><jats:sub>g</jats:sub>) ranging from 37 to 100 ℃. The adhesion of the polymer to the 2D crystals was enhanced at <jats:inline-formula><jats:alternatives><jats:tex-math>$${T}_{\text{g } }$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msub>
<mml:mi>T</mml:mi>
<mml:mtext>g</mml:mtext>
</mml:msub>
</mml:math></jats:alternatives></jats:inline-formula>. By utilizing the difference in <jats:inline-formula><jats:alternatives><jats:tex-math>$${T}_{\text{g } }$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msub>
<mml:mi>T</mml:mi>
<mml:mtext>g</mml:mtext>
</mml:msub>
</mml:math></jats:alternatives></jats:inline-formula>, a 2D heterostructure can be transferred from a high-<jats:inline-formula><jats:alternatives><jats:tex-math>$${T}_{\text{g } }$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msub>
<mml:mi>T</mml:mi>
<mml:mtext>g</mml:mtext>
</mml:msub>
</mml:math></jats:alternatives></jats:inline-formula> polymer to a lower-<jats:inline-formula><jats:alternatives><jats:tex-math>$${T}_{\text{g } }$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msub>
<mml:mi>T</mml:mi>
<mml:mtext>g</mml:mtext>
</mml:msub>
</mml:math></jats:alternatives></jats:inline-formula> 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 WTe<jats:sub>2</jats:sub>, 3-layer MoTe<jats:sub>2</jats:sub>, 2-layer WTe<jats:sub>2</jats:sub>/few-layer Cr<jats:sub>2</jats:sub>Ge<jats:sub>2</jats:sub>Te<jats:sub>6</jats:sub>, and twisted double bilayer WTe<jats:sub>2</jats:sub> demonstrate that this process can be utilized as a versatile sample fabrication method for investigating the energy spectra of 2D heterostructures.</jats:p>

リンク情報
DOI
https://doi.org/10.1038/s41598-022-14845-z
ID情報
  • DOI : 10.1038/s41598-022-14845-z
  • ISSN : 2045-2322
  • ORCIDのPut Code : 139925248

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