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Band modification of graphene by periodic potential of Au(100) reconstructed surface

Au(001)の再構成表面が持つ周期ポテンシャルによるグラフェンの電子バンドの変調

寺澤 知潮  ; 保田 諭  ; 林 直輝*; 乗松 航*; 伊藤 孝寛*; 町田 真一*; 矢野 雅大  ; 斉木 幸一朗*; 朝岡 秀人 

Terasawa, Tomoo; Yasuda, Satoshi; Hayashi, Naoki*; Norimatsu, Wataru*; Ito, Takahiro*; Machida, Shinichi*; Yano, Masahiro; Saiki, Koichiro*; Asaoka, Hidehito

One-dimensional (1-D) periodic potential is known to modify the electronic band structure of graphene. Such the modification were observed on vicinal surfaces of Ir(332) and Pt(997) by angle resolved photoemission spectroscopy (ARPES). In these reports, however, the mixing of the orbitals of graphene and substrates were also observed. In order to focus on the effect of the 1-D periodic potential, graphene growth on the more inert surface was required. Here we report the band modification of graphene by a periodic potential of a hex-Au(100) reconstructed surface. Hex-Au(100) is composed of a square lattice of Au(100) in the bulk and a hexagonal lattice on the surface, resulting in the corrugated structure with the periodicity L=1.44 nm. We prepared graphene on hex-Au(100) by chemical vapor deposition. The periodic structure of hex-Au(100) was observed by scanning tunnelling microscopy. The ARPES image of the sample shows the band anomaly as the band modification was predicted. This means that the periodic corrugation of hex-Au(100) modified the graphene bands.

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