[15a-PA01-1~56] 17 Nanocarbon Technology (Poster)

[15a-PA01-22] First-principles Calculations of STM Images Exhibiting Rectangular-like Lattice on Nanographene

〇Junhuan Li¹, Kouji Inagaki¹, Rongyan Sun¹, Kazuya Yamamura¹, Kenta Arima¹ (1.Osaka Univ.)

Keywords:Scanning tunneling microscopy, First-principles calculation, Graphene nanoribbon

Electronic structures derived from a local defect in graphene play important roles in various engineering fields. We used scanning tunneling microscopy to observe a nanographene sheet, in which a unique rectangular-like superstructure was visualized. To investigate its origin, first-principles calculations were performed to obtain the electronic structures of graphene nanoribbons with edge defects opposed. Simulated STM images revealed the condition of a ribbon width to create a rectangular phase quite similar to that observed experimentally. Then we found that the calculation results also depend on the sample biases.