Thermally induced atomic reconstruction into fully commensurate structures of transition metal dichalcogenide layers

Ji Hwan Baek, Hyoung Gyun Kim, Soo Yeon Lim, Seong Chul Hong, Yunyeong Chang, Huije Ryu, Yeonjoon Jung, Hajung Jang, Jungcheol Kim, Yichao Zhang, Kenji Watanabe, Takashi Taniguchi, Pinshane Y. Huang, Hyeonsik Cheong, Miyoung Kim, Gwan Hyoung Lee

Research output: Contribution to journalArticlepeer-review

Abstract

Twist angle between two-dimensional layers is a critical parameter that determines their interfacial properties, such as moiré excitons and interfacial ferro-electricity. To achieve better control over these properties for fundamental studies and various applications, considerable efforts have been made to manipulate twist angle. However, due to mechanical limitations and the inevitable formation of incommensurate regions, there remains a challenge in attaining perfect alignment of crystalline orientation. Here we report a thermally induced atomic reconstruction of randomly stacked transition metal dichalcogenide multilayers into fully commensurate heterostructures with zero twist angle by encapsulation annealing, regardless of twist angles of as-stacked samples and lattice mismatches. We also demonstrate the selective formation of R- and H-type fully commensurate phases with a seamless lateral junction using chemical vapour-deposited transition metal dichalcogenides. The resulting fully commensurate phases exhibit strong photoluminescence enhancement of the interlayer excitons, even at room temperature, due to their commensurate structure with aligned momentum coordinates. Our work not only demonstrates a way to fabricate zero-twisted, two-dimensional bilayers with R- and H-type configurations, but also provides a platform for studying their unexplored properties.

Original languageEnglish (US)
Pages (from-to)1463-1469
Number of pages7
JournalNature Materials
Volume22
Issue number12
DOIs
StatePublished - Dec 2023
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • General Materials Science

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