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Nano Research

Article Title

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

Authors

Hui Chen, Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
Yande Que, Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
Lei Tao, Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
Yu-Yang Zhang, Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
Xiao Lin, Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
Wende Xiao, Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
Dongfei Wang, Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
Shixuan Du, Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
Sokrates T. Pantelides, Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37235, USA Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
Hong-Jun Gao, Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China

Keywords

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

Abstract

ABSTRACT 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. 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.

Graphical Abstract

Publisher

Tsinghua University Press

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