Phys. Rev. Lett. 95, 155505 (2005) [4 pages]

Negative Differential Conductance and Hot Phonons in Suspended Nanotube Molecular Wires

Abstract

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Eric Pop^1,2, David Mann¹, Jien Cao¹, Qian Wang¹, Kenneth Goodson², and Hongjie Dai^1,*
¹Department of Chemistry and Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
²Department of Mechanical Engineering and Thermal Sciences, Stanford University, Stanford, California 94305, USA

Received 4 June 2005; published 7 October 2005

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 self-heating are exploited for the first time to probe the thermal conductivity of individual SWNTs (∼3600 W m^-1 K^-1 at T=300 K) up to ∼700 K, and reveal a 1/T dependence expected for umklapp phonon scattering at high temperatures.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.95.155505

DOI:

10.1103/PhysRevLett.95.155505

PACS:

63.22.+m, 61.46.+w, 65.80.+n, 68.65.−k

^*Email address: hdai@stanford.edu

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Phys. Rev. Lett. 95, 155505 (2005) [4 pages]

Negative Differential Conductance and Hot Phonons in Suspended Nanotube Molecular Wires