Exciton radiative lifetime in a monoatomic carbon chain

TL;DR

This paper investigates the exciton radiative lifetime in monoatomic carbon chains, combining experimental observations with theoretical modeling to understand how it depends on chain length and band-gap, revealing insights into their optical properties.

Contribution

It extends non-local dielectric response theory to predict exciton radiative lifetimes in polyyne chains, aligning theoretical predictions with experimental data.

Findings

Good agreement between theory and experiment on exciton lifetime

Radiative lifetime depends on chain length and band-gap

Enhanced understanding of excitonic effects in 1D carbon chains

Abstract

Linear carbon-based materials such as polyyne and cumulene oligomers provide a versatile platform for nano-physics and engineering. Direct gap quasi-1D polyyne structures are promising for the observation of strong and unusual excitonic eects arising due to the two-dimensional quantum connement. Recently, we reported on the observation of sharp exciton peaks in low temperature photoluminescence spectra of polyyne chains. Here, we analyse the time-resolved optical response of this system. We extend the non-local dielectric response theory to predict the exciton radiative lifetime dependence on the band-gap value and on the length of the chain. A good agreement between the experiment and the theory is achieved.