Fabrication and properties of silicene and silicene–graphene layered structures on Ir (111)

Meng Lei^a),^b), Wang Ye-Liang†^b), Zhang Li-Zhi^b), Du Shi-Xuan^b), Gao Hong-Jun‡^b)

LEED pattern, STM image and the corresponding schematic diagrams of graphene on Ir (111) after silicon intercalation. (a) A group of new spots appearing within the circle of Ir (111) diffraction spots, which is obtained at 67 eV. (b) STM image ( U =−0.38 V, I = 0.13 nA) showing two distinct ordered domains (marked as A and B ) with a periodicity of 1.2 nm. (c) Sketch of the diffraction spots shown in panel (a), where the reciprocal vectors of each group of spots are indicated by white, red, and blue arrows respectively. (d) Schematic diagram of the diffraction spots in real space, revealing a superstructure [lattice vectors ( a ₁, b ₁) or ( a ₂, b ₂)] with respect to the Ir (111) lattice [lattice vectors ( a ₀, b ₀)].^{[ 74 ]}