TU Darmstadt / ULB / TUbiblio

Raman Spectroscopic Evidence for Hot-Phonon Generation in Electrically Biased Carbon Nanotubes

Oron-Carl, Matti and Krupke, Ralph (2008):
Raman Spectroscopic Evidence for Hot-Phonon Generation in Electrically Biased Carbon Nanotubes.
In: Physical Review Letters, 100 (12), pp. 127401(1-4), ISSN 0031-9007,
[Online-Edition: http://dx.doi.org/10.1103/PhysRevLett.100.127401],
[Article]

Abstract

We provide spectroscopic evidence for hot-phonon generation in biased single-walled carbon nanotubes by measuring simultaneously the Stokes and anti-Stokes Raman lines of the G mode and of the radial-breathing mode as a function of current bias. Using Bose-Einstein statistics we can directly calculate the phonon temperature from the intensity ratio of the anti-Stokes to Stokes lines. Upon nanotube biasing we observe (i) an increase of the G mode phonon temperature in contrast to the radial-breathing mode phonons that remain thermalized at room temperature, and (ii) no softening of the G mode. Based on these observations, we exclude current-induced thermal heating of the nanotube.

Item Type: Article
Erschienen: 2008
Creators: Oron-Carl, Matti and Krupke, Ralph
Title: Raman Spectroscopic Evidence for Hot-Phonon Generation in Electrically Biased Carbon Nanotubes
Language: English
Abstract:

We provide spectroscopic evidence for hot-phonon generation in biased single-walled carbon nanotubes by measuring simultaneously the Stokes and anti-Stokes Raman lines of the G mode and of the radial-breathing mode as a function of current bias. Using Bose-Einstein statistics we can directly calculate the phonon temperature from the intensity ratio of the anti-Stokes to Stokes lines. Upon nanotube biasing we observe (i) an increase of the G mode phonon temperature in contrast to the radial-breathing mode phonons that remain thermalized at room temperature, and (ii) no softening of the G mode. Based on these observations, we exclude current-induced thermal heating of the nanotube.

Journal or Publication Title: Physical Review Letters
Volume: 100
Number: 12
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Molekulare Nanostrukturen
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Nov 2011 12:43
Official URL: http://dx.doi.org/10.1103/PhysRevLett.100.127401
Identification Number: doi:10.1103/PhysRevLett.100.127401
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)

View Item View Item