# Organic molecular tuning of many-body interaction energies in air-suspended carbon nanotubes

## TL;DR

This study explores how adsorbed copper phthalocyanine molecules influence many-body interaction energies in air-suspended carbon nanotubes, revealing charge transfer and dielectric screening effects through spectroscopic analysis.

## Contribution

It demonstrates the tunability of exciton and trion energies via molecular adsorption, highlighting the role of dielectric screening in many-body interactions in nanotubes.

## Key findings

- Exciton energies redshift with increased molecular deposition
- Trion emission appears at high deposition levels indicating charge transfer
- Many-body interaction energies scale with molecular dielectric screening

## Abstract

We investigate adsorption effects of copper phthalocyanine molecules on excitons and trions in air-suspended carbon nanotubes. Using photoluminescence excitation spectroscopy, we observe that exciton energy redshifts gradually with the molecular deposition thickness. The trion emission is also observed at large deposition amounts, which indicates charge transfer between the phthalocyanine molecules and carbon nanotubes. Analysis of the spectra for individual tubes reveal a correlation between the exciton-trion energy separation and the exciton emission energy, showing that the many-body interaction energies scale similarly with the molecular dielectric screening.