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

Oron-Carl, Matti ; Krupke, Ralph (2008)
Raman Spectroscopic Evidence for Hot-Phonon Generation in Electrically Biased Carbon Nanotubes.
In: Physical Review Letters, 100 (12)
doi: 10.1103/PhysRevLett.100.127401
Artikel, Bibliographie

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2008
Autor(en): Oron-Carl, Matti ; Krupke, Ralph
Art des Eintrags: Bibliographie
Titel: Raman Spectroscopic Evidence for Hot-Phonon Generation in Electrically Biased Carbon Nanotubes
Sprache: Englisch
Publikationsjahr: 28 März 2008
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Physical Review Letters
Jahrgang/Volume einer Zeitschrift: 100
(Heft-)Nummer: 12
DOI: 10.1103/PhysRevLett.100.127401
Kurzbeschreibung (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.

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Molekulare Nanostrukturen
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 08 Nov 2011 12:43
Letzte Änderung: 05 Mär 2013 09:55
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