# Cold exciton electroluminescence from air-suspended carbon nanotube split-gate devices

## TL;DR

This paper demonstrates electroluminescence from air-suspended carbon nanotubes in split-gate devices, showing high-quality emission with minimal heating effects, and attributes the emission to electrostatically formed $pn$-junctions.

## Contribution

It provides the first detailed characterization of electroluminescence in air-suspended nanotube split-gate devices, linking emission to electrostatic $pn$-junctions.

## Key findings

- Electroluminescence linewidth matches photoluminescence, indicating low heating.
- Emission is consistent with electrostatically formed $pn$-junctions.
- Chirality of nanotubes is identified via photoluminescence spectroscopy.

## Abstract

Electroluminescence from individual carbon nanotubes within split-gate devices is investigated. By characterizing the air-suspended nanotubes with photoluminescence spectroscopy, chirality is identified and electroluminescence peaks are assigned. We observe electroluminescence linewidth comparable to photoluminescence, indicating negligible heating and state-mixing effects. Split-gate and bias voltage dependences are consistent with emission from an electrostatically formed $pn$-junction.