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

Nano Letters
Koichiro IenagaFumio Komori

Abstract

Local 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.

References

Aug 19, 2006·Science·Taisuke OhtaEli Rotenberg
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Jun 13, 2009·Physical Review Letters·Guohong LiEva Y Andrei
Sep 12, 2012·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Katharina J Franke, Jose Ignacio Pascual
Jun 26, 2015·Nature Communications·Hyo Won KimHwansoo Suh
Jul 22, 2015·Physical Review Letters·Fabian D NattererJoseph A Stroscio

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Citations

Jul 4, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yong SunZi-Wu Wang

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