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Surface Transport Properties of Pb-Intercalated Graphene.

Markus GruschwitzChitran GhosalTing-Hsuan ShenSusanne WolffThomas SeyllerChristoph Tegenkamp
Published in: Materials (Basel, Switzerland) (2021)
Intercalation experiments on epitaxial graphene are attracting a lot of attention at present as a tool to further boost the electronic properties of 2D graphene. In this work, we studied the intercalation of Pb using buffer layers on 6H-SiC(0001) by means of electron diffraction, scanning tunneling microscopy, photoelectron spectroscopy and in situ surface transport. Large-area intercalation of a few Pb monolayers succeeded via surface defects. The intercalated Pb forms a characteristic striped phase and leads to formation of almost charge neutral graphene in proximity to a Pb layer. The Pb intercalated layer consists of 2 ML and shows a strong structural corrugation. The epitaxial heterostructure provides an extremely high conductivity of σ=100 mS/□. However, at low temperatures (70 K), we found a metal-insulator transition that we assign to the formation of minigaps in epitaxial graphene, possibly induced by a static distortion of graphene following the corrugation of the interface layer.
Keyphrases
  • heavy metals
  • room temperature
  • carbon nanotubes
  • aqueous solution
  • walled carbon nanotubes
  • high resolution
  • risk assessment
  • ms ms
  • working memory
  • high throughput
  • mass spectrometry
  • electron microscopy