Coupling and Decoupling of Bilayer Graphene Monitored by Electron Energy Loss Spectroscopy

Yung Chang Lin, Amane Motoyama, Pablo Solís-Fernández, Rika Matsumoto, Hiroki Ago, Kazu Suenaga

Research output: Contribution to journalArticlepeer-review

Abstract

We studied the interlayer coupling and decoupling of bilayer graphene (BLG) using spatially resolved electron energy loss spectroscopy with a monochromated electron source. We correlated the twist-angle-dependent energy band hybridization with Moiré superlattices and the corresponding optical absorption peaks. The optical absorption peak originates from the excitonic transition between the hybridized van Hove singularities (vHSs), which shifts systematically with the twist angle. We then proved that the BLG decouples when a monolayer of metal chloride is intercalated in its van der Waals gap and results in the elimination of the vHS peak.

Original languageEnglish
JournalNano Letters
DOIs
Publication statusAccepted/In press - 2021

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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