Manifestation of Structure of Electron Bands in Double-Resonant Raman Spectra of Single-Walled Carbon Nanotubes

Yurii Stubrov; Andrii Nikolenko; Viktor Gubanov; Viktor Strelchuk

doi:10.1186/s11671-015-1213-8

Manifestation of Structure of Electron Bands in Double-Resonant Raman Spectra of Single-Walled Carbon Nanotubes

Nanoscale Res Lett. 2016 Dec;11(1):2. doi: 10.1186/s11671-015-1213-8. Epub 2016 Jan 5.

Authors

Yurii Stubrov¹, Andrii Nikolenko², Viktor Gubanov³, Viktor Strelchuk²

Affiliations

¹ V.E. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45 Nauky pr., 03028, Kyiv, Ukraine. chig-ua@rambler.ru.
² V.E. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45 Nauky pr., 03028, Kyiv, Ukraine.
³ Department of Physics, Kyiv National Taras Shevchenko University, 64 Volodymyrs'ka str., 01601, Kyiv, Ukraine.

Abstract

Micro-Raman spectra of single-walled carbon nanotubes in the range of two-phonon 2D bands are investigated in detail. The fine structure of two-phonon 2D bands in the low-temperature Raman spectra of the mixture and individual single-walled carbon nanotubes is considered as the reflection of structure of their π-electron zones. The dispersion behavior of 2D band fine structure components in the resonant Raman spectra of single-walled carbon nanotube mixture is studied depending on the energy of excitating photons. The role of incoming and outgoing electron-phonon resonances in the formation of 2D band fine structure in Raman spectra of single-walled carbon nanotubes is analyzed. The similarity of dispersion behavior of 2D phonon bands in single-walled carbon nanotubes, one-layer graphene, and bulk graphite is discussed.

Keywords: Arc-discharge method; Double electron-phonon resonance mechanism (DR); Graphene; Resonance Raman spectroscopy; Single-walled carbon nanotube (SWCNT); Trigonal warping; Van Hove singularities.