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.
@article{arxiv.2101.00953,
title = {Exciton radiative lifetime in a monoatomic carbon chain},
author = {Stella Kutrovskaya and Sevak Demirchyan and Anton Osipov and Stepan Baryshev and Anton Zasedatelev and Pavlos Lagoudakis and Alexey Kavokin},
journal= {arXiv preprint arXiv:2101.00953},
year = {2021}
}