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Modulation of Electron–Phonon Coupling in One-Dimensionally Nanorippled Graphene on a Macrofacet of 6H-SiC
journal contribution
posted on 2017-05-18, 00:00 authored by Koichiro Ienaga, Takushi Iimori, Koichiro Yaji, Toshio Miyamachi, Shuhei Nakashima, Yukio Takahashi, Kohei Fukuma, Shingo Hayashi, Takashi Kajiwara, Anton Visikovskiy, Kazuhiko Mase, Kan Nakatsuji, Satoru Tanaka, Fumio KomoriLocal
electron–phonon 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 electron–phonon
coupling to the out-of-plane phonon at the K̅ 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 electron–phonon
coupling in the surface graphene.
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6 H-SiC substrateout-of-plane phononsubstrate SiCmillimeter scaleripple structure6 H-SiC6 H-SiC crystalSTMangle-resolved photoelectron spectroscopysurface graphenegraphene nanoribbonsmacroscopic ARPESreplica bandsOne-Dimensionally Nanorippled Grapheneone-dimensionally nanorippled grapheneinterface carbon nanostructure
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