Negative Differential Conductance and Hot Phonons in Suspended Nanotube Molecular Wires
作者： Eric Pop , David Mann , Jien Cao , Qian Wang , Kenneth Goodson
DOI: 10.1103/PHYSREVLETT.95.155505
关键词:
摘要: Freely suspended metallic single-walled carbon nanotubes (SWNTs) exhibit reduced current carrying ability compared to those lying on substrates, and striking negative differential conductance at low electric fields. Theoretical analysis reveals significant self-heating effects including electron scattering by hot nonequilibrium optical phonons. Electron transport characteristics under strong are exploited for the first time probe thermal conductivity of individual SWNTs (approximately 3600 W m-1 K-1 T=300 K) up approximately 700 K, reveal a 1/T dependence expected umklapp phonon high temperatures.
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