Journal
PHYSICAL REVIEW B
Volume 80, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.235422
Keywords
density functional theory; edge dislocations; electron microscopy; etching; graphene; island structure; ruthenium; scanning tunnelling microscopy
Funding
- U. S. DOE [DE-AC04-94AL85000, DE-AC02-05CH11231]
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Low-energy electron microscopy reveals a mode of graphene growth on Ru(0001) in which Ru atoms are etched from a step edge and injected under a growing graphene sheet. Based on density-functional calculations, we propose a model wherein injected Ru atoms form metastable islands under the graphene. Scanning tunneling microscopy reveals that dislocation networks exist near step edges, consistent with some of the injected atoms being incorporated into the topmost Ru layer, thereby increasing its density.
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