Negative differential conductance and hot phonons in suspended nanotube molecular wires |
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Authors: | Pop Eric Mann David Cao Jien Wang Qian Goodson Kenneth Dai Hongjie |
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Institution: | Department of Chemistry and Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA. |
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Abstract: | 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. |
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