Theory of infrared-active phonons in carbon nanotubes

Gun Sang Jeon; G. D. Mahan

doi:10.1103/PhysRevB.72.155415

Theory of infrared-active phonons in carbon nanotubes

Gun Sang Jeon
, G. D. Mahan

Department of Physics

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

14 Scopus citations

Abstract

The phonons of single-wall carbon nanotubes are investigated within a generalized bond-charge model. The computed phonon dispersions generally agree with earlier results: two acoustic phonons (longitudinal and rotating), flexure modes at low frequencies, and radius-dependent radial breathing modes. Computation of the strength of the infrared active phonons reveals that only three modes have the first-order infrared activity in achiral tubes. We compare the observed modes with both experimental and group-theoretical results and discuss the characters of infrared-active modes.

Original language	English
Article number	155415
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	72
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevB.72.155415
State	Published - 15 Oct 2005

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10.1103/PhysRevB.72.155415

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title = "Theory of infrared-active phonons in carbon nanotubes",

abstract = "The phonons of single-wall carbon nanotubes are investigated within a generalized bond-charge model. The computed phonon dispersions generally agree with earlier results: two acoustic phonons (longitudinal and rotating), flexure modes at low frequencies, and radius-dependent radial breathing modes. Computation of the strength of the infrared active phonons reveals that only three modes have the first-order infrared activity in achiral tubes. We compare the observed modes with both experimental and group-theoretical results and discuss the characters of infrared-active modes.",

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N2 - The phonons of single-wall carbon nanotubes are investigated within a generalized bond-charge model. The computed phonon dispersions generally agree with earlier results: two acoustic phonons (longitudinal and rotating), flexure modes at low frequencies, and radius-dependent radial breathing modes. Computation of the strength of the infrared active phonons reveals that only three modes have the first-order infrared activity in achiral tubes. We compare the observed modes with both experimental and group-theoretical results and discuss the characters of infrared-active modes.

AB - The phonons of single-wall carbon nanotubes are investigated within a generalized bond-charge model. The computed phonon dispersions generally agree with earlier results: two acoustic phonons (longitudinal and rotating), flexure modes at low frequencies, and radius-dependent radial breathing modes. Computation of the strength of the infrared active phonons reveals that only three modes have the first-order infrared activity in achiral tubes. We compare the observed modes with both experimental and group-theoretical results and discuss the characters of infrared-active modes.

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DO - 10.1103/PhysRevB.72.155415

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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Theory of infrared-active phonons in carbon nanotubes

Abstract

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