Electron-phonon coupling in single-walled carbon nanotubes determined by shot noise

摘要

We have measured shot noise in metallic single-walled carbon nanotubes of length L=1 u0002m andnhave found strong suppression of noise with increasing voltage. We conclude that the coupling ofnelectron and phonon baths at temperatures Te and Tph is described at intermediate bias u000220 mVnu0003Vdsu0004200 mVu0003 by heat flow equation P=u0005Lu0002Ten3n−Tphn3nu0003, where u0005u00043u000610−9nW/mK3ndue tonelectron interaction with acoustic phonons, while at higher voltages optical phonon-electronninteraction leads to P=u0007opLu0005Nu0002Teu0003−Nu0002Tphu0003u0006, where Nu0002Tu0003=1/ u0005expu0002bt/kBTu0003−1u0006 with optical phononnenergy bt and u0007op=2u0006102nW/m. © 2010 American Institute of Physics. u0005doi:10.1063/1.3533018