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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

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

Detail(s)

Original languageEnglish
Article number155431
Journal / PublicationPhysical Review B
Volume102
Issue number15
Online published29 Oct 2020
Publication statusPublished - Oct 2020
Externally publishedYes

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.

Citation Format(s)

Ultrafast formation of a transient two-dimensional diamondlike structure in twisted bilayer graphene. / Luo, Duan; Hui, Dandan; Wen, Bin; Li, Renkai; Yang, Jie; Shen, Xiaozhe; Reid, Alexander Hume; Weathersby, Stephen; Kozina, Michael E.; Park, Suji; Ren, Yang; Loeffler, Troy D.; Sankaranarayanan, S. K. R. S.; Chan, Maria K. Y.; Wang, Xing; Tian, Jinshou; Arslan, Ilke; Wang, Xijie; Rajh, Tijana; Wen, Jianguo.

In: Physical Review B, Vol. 102, No. 15, 155431, 10.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review