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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