Biexciton stability in carbon nanotubes

TL;DR

This paper uses quantum Monte Carlo and tight-binding models to calculate biexciton binding energies in carbon nanotubes, revealing energies higher than prior estimates, potentially enabling room-temperature applications.

Contribution

It provides the first comprehensive calculation of biexciton binding energies across various nanotube diameters and chiralities using advanced computational methods.

Findings

Biexciton binding energies are significantly larger than previous predictions.

Binding energies exceed room temperature thermal energy for typical nanotubes.

Results suggest potential for room-temperature optoelectronic applications.

Abstract

We have applied the quantum Monte Carlo method and tight-binding modelling to calculate the binding energy of biexcitons in semiconductor carbon nanotubes for a wide range of diameters and chiralities. For typical nanotube diameters we find that biexciton binding energies are much larger than previously predicted from variational methods, which easily brings the biexciton binding energy above the room temperature threshold.