Modulation of Electron-Phonon Coupling in One-Dimensionally Nanorippled Graphene on a Macrofacet of 6H-SiC

作者：Ienaga Koichiro^*; Iimori Takushi; Yaji Koichiro; Miyamachi Toshio; Nakashima Shuhei; Takahashi Yukio; Fukuma Kohei; Hayashi Shingo; Kajiwara Takashi; Visikovskiy Anton; Mase Kazuhiko; Nakatsuji Kan; Tanaka Satoru; Komori Fumio^*

来源：Nano Letters, 2017, 17(6): 3527-3532.

DOI：10.1021/acs.nanolett.7b00606

• Graphene
• electron-phonon coupling
• STM
• inelastic tunneling spectroscopy
• ARPES

Local electronphonon coupling of a one-dimensionally nanorippled graphene is studied on a SiC(0001) vicinal substrate. We have characterized local atomic and electronic structures of a periodically nanorippled graphene (3.4 nm period) prepared on a macrofacet of the 6H-SiC crystal using scanning tunneling microscopy/spectroscopy (STM/STS) and angle-resolved photoelectron spectroscopy (ARPES). The rippled graphene on the macrofacets distributes homogeneously over the 6H-SiC substrate in a millimeter scale, and thus replica bands are detected by the macroscopic ARPES. The STM/STS results indicate the strength of electronphonon coupling to the out-of-plane phonon at the (K) over bar points of graphene is periodically modified in accordance with the ripple structure. We propose an interface carbon nanostructure with graphene nanoribbons between the surface rippled graphene and the substrate SiC that periodically modifies the electronphonon coupling in the surface graphene.

• 出版日期2017-6