Negative differential conductance and hot phonons in suspended nanotube molecular wires.

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 (approximately 3600 W m-1 K-1 at T=300 K) up to approximately 700 K, and reveal a 1/T dependence expected for umklapp phonon scattering at high temperatures.

[1]  N. Goldsman,et al.  Semiclassical transport and phonon scattering of electrons in semiconducting carbon nanotubes , 2003 .

[2]  P. McEuen,et al.  Thermal transport measurements of individual multiwalled nanotubes. , 2001, Physical Review Letters.

[3]  Qian Wang,et al.  Ten- to 50-nm-long quasi-ballistic carbon nanotube devices obtained without complex lithography. , 2004, Proceedings of the National Academy of Sciences of the United States of America.

[4]  Mohamed A. Osman,et al.  Temperature dependence of the thermal conductivity of single-wall carbon nanotubes , 2001 .

[5]  P. McEuen,et al.  Electron-Phonon Scattering in Metallic Single-Walled Carbon Nanotubes , 2003, cond-mat/0309641.

[6]  宁北芳,et al.  疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A , 2005 .

[7]  Dekker,et al.  High-field electrical transport in single-wall carbon nanotubes , 1999, Physical review letters.

[8]  Phaedon Avouris,et al.  Electron-phonon interaction and transport in semiconducting carbon nanotubes. , 2005, Physical review letters.

[9]  D. Nezich,et al.  Environment effects on the Raman spectra of individual single-wall carbon nanotubes: Suspended and grown on polycrystalline silicon , 2004 .

[10]  Qian Wang,et al.  Suspended carbon nanotube quantum wires with two gates. , 2005, Small.

[11]  O. Urakawa,et al.  Small - , 2007 .

[12]  J. M. Oshorn.  Proc. Nat. Acad. Sei , 1978 .

[13]  Robert H. Hauge,et al.  Purification and Characterization of Single-Wall Carbon Nanotubes , 2001 .

[14]  Universal features of quantized thermal conductance of carbon nanotubes. , 2003, Physical review letters.

[15]  Jing Guo,et al.  High-field quasiballistic transport in short carbon nanotubes. , 2003, Physical review letters.

[16]  J. Kong,et al.  Electrical generation and absorption of phonons in carbon nanotubes , 2004, Nature.

[17]  Kazuyoshi Fushinobu,et al.  Effect of gate voltage on hot‐electron and hot phonon interaction and transport in a submicrometer transistor , 1995 .

[18]  J. Gilman,et al.  Nanotechnology , 2001 .

[19]  V. Driel.  Influence of hot phonons on energy relaxation of high-density carriers in germanium , 1979 .

[20]  Qian Wang,et al.  Ballistic Transport in Metallic Nanotubes with Reliable Pd Ohmic Contacts , 2003 .