Nonlinear charging, and transport times in doped nanotubes junctions

TL;DR

This paper calculates the nonlinear capacitance and transport times in doped nanotube junctions, revealing rapid switching capabilities and relaxation times due to negative differential resistance effects.

Contribution

It provides a self-consistent calculation of nonlinear capacitance and estimates ultrafast relaxation and switching times in doped nanotube junctions.

Findings

Nonlinear capacitance decreases with bias beyond the pseudogap.

Relaxation time is approximately 0.1 femtoseconds.

Switching time can be less than 1 femtosecond due to NDR.

Abstract

The nonlinear capacitance in doped nanotube junctions is calculated self consistently. It decreases as a function of the applied bias when the latter becomes larger than the pseudogap of the nanotube. For this device, one can deduce a relaxation time of about 0.1 femtosecond. Because of its negative differential resistance (NDR), a switching time of less than a fs can also be deduced.