Current Oscillations and Negative Resistances in Crossed Carbon Nanotubes Suspended Over a Dielectric Trench

TL;DR

This paper reports on the discovery of current oscillations and negative differential resistance in a nanostructure of crossed suspended carbon nanotubes, with potential applications in high-frequency nanoelectronic devices.

Contribution

It demonstrates the presence of oscillatory current behavior and negative differential resistance in crossed carbon nanotubes, including their tunability and high-frequency response.

Findings

Oscillatory dependence of drain current on voltage

Negative differential resistance regions observed

Negative resistance persists up to 100 MHz bandwidth

Abstract

An oscillatory dependence of the drain current on the drain voltage is found in a nanostructure consisting of two crossing semiconductor carbon nanotubes that are suspended over a dielectric trench, which is backed by a doped silicon substrate that acts as a gate. Alternating positive and negative differential resistance regions are generated as a function of the drain source values and can be slightly shifted by the gate voltage. Moreover, the negative differential resistance is retrieved in a large bandwidth, of up to 100 MHz, when the structure is excited with ac signals.