Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-07-20
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 4 figures submitted to Physical Review Letters
Scientific paper
High bias electrical transport characteristics of freely suspended metallic single-walled carbon nanotubes (SWNTs) are investigated at 250-400K in vacuum and various gases. Self-heating is exploited to examine the temperature dependence of phonon transport and optical phonon decay in SWNTs. The acoustic phonon thermal conductivity of a SWNT follows ~1/T at high temperatures. Non-equilibrium optical phonon effects in suspended nanotubes decrease as the ambient temperature increases. Gas molecules assist the relaxation of hot optical phonons along the tube length and enable enhanced current flow. In vacuum, high bias breakdown of suspended SWNTs can occur via melting caused by electrically emitted hot optical phonons at a low acoustic phonon temperature.
Cao Jien
Dai* Hongjie
Goodson Kenneth
Mann David
Pop Eric
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