Negative Differential Conductance and Hot Phonons in Suspended Nanotube Molecular Wires

Details Negative Differential Conductance and Hot Phonons in Suspended Nanotube Molecular Wires Negative Differential Conductance and Hot Phonons in Suspended Nanotube Molecular Wires

2005-06-05

arxiv.org/abs/cond-mat/0506122v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

PRL, in press

Scientific paper

10.1103/PhysRevLett.95.155505

Freely suspended metallic single-wall carbon nanotubes (SWNTs) exhibit reduced current carrying ability compared to those lying on substrates, and striking negative differential conductance (NDC) at low electric fields. Theoretical analysis reveals significant self-heating effects including electron scattering by hot non-equilibrium optical phonons. Electron transport characteristics under strong self-heating are exploited for the first time to probe the thermal conductivity of individual SWNTs (~ 3600 Wm-1K-1 at T=300 K) up to ~700 K, and reveal a 1/T dependence expected for Umklapp phonon scattering at high temperatures.

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