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

الأصل · EN

We have measured shot noise in metallic single-walled carbon nanotubes of length L=1 μm and have found strong suppression of noise with increasing voltage. We conclude that the coupling of electron and phonon baths at temperatures Tₑ and Tph is described at intermediate bias (20 mV < 200 mV) by heat flow equation P=ΣL (Tₑ³-Tph³) where Σ 3 · 10⁻⁹ W/mK³ due to electron interaction with acoustic phonons, while at higher voltages optical phonon - electron interaction leads to P =κop L [N (Tₑ)-N(Tph)] where N(T)= 1/((ℏΩ/kBT)-1) with optical phonons energy ℏ Ω and κop=2 · 10² W/m.