Multi-particle Auger dissociation of excitons in shallow doped carbon nanotubes

TL;DR

This paper investigates how shallow doping in carbon nanotubes leads to exciton dissociation through a multi-particle Auger process, with implications for understanding exciton dynamics in nanomaterials.

Contribution

It predicts a novel multi-particle Auger decay mechanism for exciton dissociation in doped carbon nanotubes, emphasizing the role of electronic state chirality.

Findings

Shallow hole-doping causes exciton quenching without affecting ground state absorption.

The proposed Auger decay mechanism efficiently dissociates excitons into electron-hole pairs.

Chirality-dependent electronic states influence the dissociation process.

Abstract

Shallow hole-doping in small diameter single-wall carbon nanotubes by H$_2$O$_2$ is shown to result in delocalized excited state quenching with no effects on the ground state absorption spectrum. To account for this process, the dissociation of excitons by shallow level electronic impurities is predicted to occur by multi-particle Auger decay. This mechanism, which relies on the chirality of the electronic states, causes the exciton to decay into electron-hole pairs with very high efficiencies.