High-Field, Quasi-Ballistic Transport in Short Carbon Nanotubes

TL;DR

This study investigates electron transport in short carbon nanotubes, revealing quasi-ballistic behavior at nanometer scales and high current capacities, which are crucial for advanced nanotube-based electronics.

Contribution

It provides experimental and theoretical insights into ballistic transport in short nanotubes, highlighting their potential for high-performance electronic applications.

Findings

Mean free path for acoustic phonons ~300 nm

Optical phonon scattering length ~15 nm

High currents up to 70 μA in short nanotubes

Abstract

Single walled carbon nanotubes with Pd ohmic contacts and lengths ranging from several microns down to 10 nm are investigated by electron transport experiments and theory. The mean free path (mfp) for acoustic phonon scattering is estimated to be lap~300 nm, and that for optical phonon scattering is lop~15 nm. Transport through very short (~10 nm) nanotubes is free of significant acoustic and optical phonon scattering and thus ballistic and quasi-ballistic at the low and high bias voltage limits respectively. High currents of up to 70 uA can flow through a short nanotube. Possible mechanisms for the eventual electrical breakdown of short nanotubes at high fields are discussed. The results presented here have important implications to high performance nanotube transistors and interconnects.