Electron-phonon coupling of G mode and assignment of a combination mode in carbon nanotubes

Y. Yin; A. G. Walsh; A. N. Vamivakas; S. B. Cronin; D. E. Prober; B. B. Goldberg

doi:10.1103/PhysRevB.84.075428

Electron-phonon coupling of G mode and assignment of a combination mode in carbon nanotubes

Y. Yin^*, A. G. Walsh, A. N. Vamivakas, S. B. Cronin, D. E. Prober, B. B. Goldberg

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

We measure the electron-phonon (e-ph) coupling matrix elements of the G band in semiconducting carbon nanotubes (CNTs) in comparison to the radial breathing mode (RBM). The experimental result for the G⁺ mode [Γ-point longitudinal optical (LO) phonon] at the E₂₂ transition suggests an e-ph coupling strength of approximately 30 meV or 12.5 eV/Å which is within the expected range of 23 meV to 83 meV for a 1-nm-diameter CNT. This coupling (as the square of the matrix elements) for the G⁺ mode is an order of magnitude higher than that of the RBM and other measured phonon modes. In addition we assign a Raman feature observed around 1700 cm^-1 to be the combination mode of a low energy (∼400 cm^-1) and a high energy (∼1300 cm^-1) zone-boundary phonon. Both the phonon energies and phonon dispersions of those modes support the assignment.

Original language	English (US)
Article number	075428
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	84
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevB.84.075428
State	Published - Aug 5 2011

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.84.075428

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title = "Electron-phonon coupling of G mode and assignment of a combination mode in carbon nanotubes",

abstract = "We measure the electron-phonon (e-ph) coupling matrix elements of the G band in semiconducting carbon nanotubes (CNTs) in comparison to the radial breathing mode (RBM). The experimental result for the G+ mode [Γ-point longitudinal optical (LO) phonon] at the E22 transition suggests an e-ph coupling strength of approximately 30 meV or 12.5 eV/{\AA} which is within the expected range of 23 meV to 83 meV for a 1-nm-diameter CNT. This coupling (as the square of the matrix elements) for the G+ mode is an order of magnitude higher than that of the RBM and other measured phonon modes. In addition we assign a Raman feature observed around 1700 cm-1 to be the combination mode of a low energy (∼400 cm-1) and a high energy (∼1300 cm-1) zone-boundary phonon. Both the phonon energies and phonon dispersions of those modes support the assignment.",

author = "Y. Yin and Walsh, {A. G.} and Vamivakas, {A. N.} and Cronin, {S. B.} and Prober, {D. E.} and Goldberg, {B. B.}",

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T1 - Electron-phonon coupling of G mode and assignment of a combination mode in carbon nanotubes

AU - Yin, Y.

AU - Walsh, A. G.

AU - Vamivakas, A. N.

AU - Cronin, S. B.

AU - Prober, D. E.

AU - Goldberg, B. B.

PY - 2011/8/5

Y1 - 2011/8/5

N2 - We measure the electron-phonon (e-ph) coupling matrix elements of the G band in semiconducting carbon nanotubes (CNTs) in comparison to the radial breathing mode (RBM). The experimental result for the G+ mode [Γ-point longitudinal optical (LO) phonon] at the E22 transition suggests an e-ph coupling strength of approximately 30 meV or 12.5 eV/Å which is within the expected range of 23 meV to 83 meV for a 1-nm-diameter CNT. This coupling (as the square of the matrix elements) for the G+ mode is an order of magnitude higher than that of the RBM and other measured phonon modes. In addition we assign a Raman feature observed around 1700 cm-1 to be the combination mode of a low energy (∼400 cm-1) and a high energy (∼1300 cm-1) zone-boundary phonon. Both the phonon energies and phonon dispersions of those modes support the assignment.

AB - We measure the electron-phonon (e-ph) coupling matrix elements of the G band in semiconducting carbon nanotubes (CNTs) in comparison to the radial breathing mode (RBM). The experimental result for the G+ mode [Γ-point longitudinal optical (LO) phonon] at the E22 transition suggests an e-ph coupling strength of approximately 30 meV or 12.5 eV/Å which is within the expected range of 23 meV to 83 meV for a 1-nm-diameter CNT. This coupling (as the square of the matrix elements) for the G+ mode is an order of magnitude higher than that of the RBM and other measured phonon modes. In addition we assign a Raman feature observed around 1700 cm-1 to be the combination mode of a low energy (∼400 cm-1) and a high energy (∼1300 cm-1) zone-boundary phonon. Both the phonon energies and phonon dispersions of those modes support the assignment.

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Electron-phonon coupling of G mode and assignment of a combination mode in carbon nanotubes

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