Strong exciton-phonon interaction assisting simultaneous enhancement of photoluminescence and Raman scattering from suspended carbon nanotubes

Hisashi Sumikura, Hiroshi Takaki, Hideyuki Maki, Masaya Notomi

Research output: Contribution to journalArticlepeer-review

Abstract

We have observed intensity enhancement in exciton photoluminescence and G-band Raman scattering of suspended pristine semiconducting carbon nanotubes (CNTs) under resonant excitation while preventing surrounding dielectric Coulomb screening and emission quenching effects. Photoluminescence excitation (PLE) microspectroscopy for the isolated CNTs shows that the PL and Raman scattering are simultaneously enhanced when the excitation photon energy is equal to the sum of the energies of the lowest-energy bright exciton and a longitudinal optical (LO) phonon. This simultaneous enhancement is attributed to a large density of states of the lowest-energy bright exciton strongly interacting with the LO phonon at the Γ point. The resonant excitation is a key to understanding the excitation and emission processes of CNTs and to designing optimal photonic nanostructures applicable to efficient CNT-based light-emitting devices.

Original languageEnglish
Article number125432
JournalPhysical Review B
Volume102
Issue number12
DOIs
Publication statusPublished - 2020 Sep

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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