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Recovery of edge states of graphene nanoislands on an iridium substrate by silicon intercalation

Journal Article · · Nano Research
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  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China); Vanderbilt Univ., Nashville, TN (United States)
  3. Vanderbilt Univ., Nashville, TN (United States); Chinese Academy of Sciences (CAS), Beijing (China)
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Finite-sized graphene sheets, such as graphene nanoislands (GNIs), are promising candidates for practical applications in graphene-based nanoelectronics. GNIs with well-defined zigzag edges are predicted to have spin-polarized edge-states similar to those of zigzag-edged graphene nanoribbons, which can achieve graphene spintronics. However, it has been reported that GNIs on metal substrates have no edge states because of interactions with the substrate. In this work, we used a combination of scanning tunneling microscopy, spectroscopy, and density functional theory calculations to demonstrate that the edge states of GNIs on an Ir substrate can be recovered by intercalating a layer of Si atoms between the GNIs and the substrate. We also found that the edge states gradually shift to the Fermi level with increasing island size. This work provides a method to investigate spin-polarized edge states in high-quality graphene nanostructures on a metal substrate.

Research Organization:
Vanderbilt Univ., Nashville, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences (CAS); National Science Foundation (NSF)
DOE Contract Number:
FG02-09ER46554; AC02-05CH11231; ACI-1053575
OSTI ID:
1597863
Journal Information:
Nano Research, Vol. 11, Issue 7; ISSN 1998-0124
Publisher:
Springer
Country of Publication:
United States
Language:
English

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graphene nanoisland
zigzag edge
edge state
scanning tunneling microscopy
density functional theory