We report the formation of superstructures induced by Mg adatoms on a single layer graphene (SLG) formed on Ni(111) substrate, where a strong metallic parabolic band is found near the Fermi level at the Γ-point of the Brillouin zone. Our valence band and core level data obtained by using synchrotron photons indicate that Mg adatoms intercalate initially to lift the SLG from the Ni substrate to produce a well-defined π-band of SLG, and then the parabolic band appears upon adding extra Mg atoms on the Mg-intercalated SLG. Our scanning tunneling microscopy images from these systems show the presence of superstructures, a 2√3 × 2√3 phase for the intercalated Mg layer below the SLG and then a √7 × √7 phase for the Mg overlayer formed on the Mg-intercalated SLG. We discuss the physical implications of these superstructures and the associated parabolic band in terms of a possible graphene-based two-dimensional superconductivity.
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7 November 2016
Research Article|
November 07 2016
Observation of Mg-induced structural and electronic properties of graphene
Heemin Park
;
Heemin Park
1Department of Physics,
Pohang University of Science and Technology
, Pohang 37673, South Korea
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Laishram Tomba Singh;
Laishram Tomba Singh
2Department of Chemistry,
Ulsan National Institute of Science and Technology
, Ulsan 44919, South Korea
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Paengro Lee;
Paengro Lee
1Department of Physics,
Pohang University of Science and Technology
, Pohang 37673, South Korea
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Jingul Kim;
Jingul Kim
1Department of Physics,
Pohang University of Science and Technology
, Pohang 37673, South Korea
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Mintae Ryu;
Mintae Ryu
1Department of Physics,
Pohang University of Science and Technology
, Pohang 37673, South Korea
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Chan-Cuk Hwang
;
Chan-Cuk Hwang
3Beamline Research Division,
Pohang Accelerator Laboratory
, Pohang 37673, South Korea
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Kwang S. Kim;
Kwang S. Kim
2Department of Chemistry,
Ulsan National Institute of Science and Technology
, Ulsan 44919, South Korea
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Jinwook Chung
Jinwook Chung
a)
1Department of Physics,
Pohang University of Science and Technology
, Pohang 37673, South Korea
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a)
Author to whom correspondence should be addressed. Electronic mail: jwc@postech.ac.kr
Appl. Phys. Lett. 109, 193104 (2016)
Article history
Received:
September 02 2016
Accepted:
October 24 2016
Citation
Heemin Park, Laishram Tomba Singh, Paengro Lee, Jingul Kim, Mintae Ryu, Chan-Cuk Hwang, Kwang S. Kim, Jinwook Chung; Observation of Mg-induced structural and electronic properties of graphene. Appl. Phys. Lett. 7 November 2016; 109 (19): 193104. https://doi.org/10.1063/1.4967178
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