Ultrafast formation of a transient two-dimensional diamondlike structure in twisted bilayer graphene

Duan Luo, Dandan Hui, Bin Wen, Renkai Li, Jie Yang, Xiaozhe Shen, Alexander Hume Reid, Stephen Weathersby, Michael E. Kozina, Suji Park, Yang Ren, Troy D. Loeffler, S. K.R.S. Sankaranarayanan, Maria K.Y. Chan, Xing Wang, Jinshou Tian, Ilke Arslan, Xijie Wang, Tijana Rajh, Jianguo Wen

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Due to the absence of matching carbon atoms at honeycomb centers with carbon atoms in adjacent graphene sheets, theorists predicted that a sliding process is needed to form AA, AB′, or ABC stacking when directly converting graphite into sp3 bonded diamond. Here, using twisted bilayer graphene, which naturally provides AA and AB′ stacking configurations, we report the ultrafast formation of a transient two-dimensional diamondlike structure (which is not observed in aligned graphene) under femtosecond laser irradiation. This photoinduced phase transition is evidenced by the appearance of bond lengths of 1.94 and 3.14 Å in the time-dependent differential pair distribution function using MeV ultrafast electron diffraction. Molecular dynamics and first-principles calculation indicate that sp3 bonds nucleate at AA and AB′ stacked areas in a moiré pattern. This work sheds light on the direct graphite-to-diamond transformation mechanism, which has not been fully understood for more than 60 years.

Original languageEnglish (US)
Article number155431
JournalPhysical Review B
Volume102
Issue number15
DOIs
StatePublished - Oct 29 2020
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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