Article Approaching the Intrinsic Properties of Moiré Structures Using Atomic Force Microscopy Ironing

Swaroop Kumar Palai ; Mateusz Dyksik ; Nikodem Sokolowski ; Mariusz Ciorga ; Estrella Sánchez Viso ; Yong Xie ; Alina Schubert ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Duncan K. Maude ; Alessandro Surrente ; Michał Baranowski ; Andres Castellanos-Gomez ; Carmen Munuera ; Paulina Plochocka

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Swaroop Kumar Palai, Mateusz Dyksik, Nikodem Sokolowski, Mariusz Ciorga, Estrella Sánchez Viso, Yong Xie, Alina Schubert, Takashi Taniguchi, Kenji Watanabe, Duncan K. Maude, Alessandro Surrente, Michał Baranowski, Andres Castellanos-Gomez, Carmen Munuera, Paulina Plochocka. Approaching the Intrinsic Properties of Moiré Structures Using Atomic Force Microscopy Ironing. Nano Letters. 2023, 23 (11), 4749-4755.
SAMURAI

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(abstract)

Stacking monolayers of transition metal dichalcogenides (TMDs) is a very effective way to engineer their properties, and has led to the discovery of a plethora of new exotic phenomena, driven by the formation of a moir ́e pattern which can be probed by the interlayer optical transition. Due to the atomic thickness and high surface to volume ratio of such heterostructures, it is expected that the interfaces play a crucial role. Fluctuations in the interlayer distance can affect the moir ́e potential, and hence the interlayer transition. Therefore, to access the intrinsic properties of the TMD stack, it is essential to obtain clean and uniform interfaces between the layers. In this work, we show that these can be provided by ironing with the tip of an atomic force microscope (AFM). Such a post-stacking procedure dramatically improve the structural homogeneity of the heterostructure, which is reflected in the interlayer exciton optical response. We show that ironing improves the layer coupling, enhancing moir ́e effects and reducing disorder in the structure. This is vital for the investigation of TMD heterostructure physics, which currently suffers from low reproducibility and inconsistent results.

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Keyword: Transition metal dichalcogenides, moiré pattern, atomic force microscope

Date published: 2023-06-14

Publisher: American Chemical Society (ACS)

Journal:

  • Nano Letters (ISSN: 15306984) vol. 23 issue. 11 p. 4749-4755

Funding:

  • Japan Society for the Promotion of Science 19H05790
  • Japan Society for the Promotion of Science 20H00354
  • Japan Society for the Promotion of Science 21H05233
  • H2020 European Research Council 755655
  • Narodowa Agencja Wymiany Akademickiej BPN/BKK/2021/1/00002/U/00001
  • Agence Nationale de la Recherche ANR-17-EURE-0009
  • European Commission PCI2019-111893-2
  • Ministerio de Ciencia e Innovaci?n PID2020-115566RB-I00
  • Narodowe Centrum Nauki 2020/38/E/ST3/00194
  • HORIZON EUROPE Marie Sklodowska-Curie Actions 956813

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1021/acs.nanolett.2c04765

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Updated at: 2025-02-15 12:30:13 +0900

Published on MDR: 2025-02-15 12:30:14 +0900

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