High Frequency Conductivity of Hot Electrons in Carbon Nanotubes

TL;DR

This paper studies how hot electrons affect high frequency conductivity in carbon nanotubes, revealing that hot electron injection enhances current peaks and that ac-fields can suppress instabilities while aiding THz radiation generation.

Contribution

It provides a semiclassical analysis of hot electron effects on high frequency conductivity in CNTs, highlighting the dual role of ac-fields in stability and THz amplification.

Findings

Hot electron injection increases current density peaks at lower frequencies.

Ac-fields suppress space-charge instability in CNTs.

Enhanced THz radiation potential due to ac-field and hot electrons.

Abstract

High frequency conductivity of hot electrons in an undoped single walled achiral carbon nanotubes (CNTs) under the influence of ac-dc driven fields is considered. We investigated semiclassically by solving the Boltzmann's transport equation with and without the presence of the hot electrons source to derive the current densities. Plots of the normalized current density versus frequency of ac-field reveal an increase in both the minimum and maximum peaks of normalized current density at lower frequencies as a result of a strong enough injection of hot electrons . The applied ac-field plays twofold role of suppressing the space-charge instability in CNT and simultaneously pumping an energy for lower frequency generation and amplification of THz radiations which have enormous promising applications in very different areas of science and technology.