Exciton energy spectra in polyyne chains

Recently, we have experimentally observed signatures of sharp exciton peaks in the photoluminescence spectra of bundles of monoatomic carbon chains stabilized by gold nanoparticles and deposited on a glass substrate. Here we estimate the characteristic energies of excitonic transitions in this complex quasi-one-dimensional nanosystem with use of the variational method. We show that the characteristic energy scale for the experimentally observed excitonic fine structure is governed by the interplay between the hopping energy in a Van der Waals quasicrystal formed by parallel carbon chains, neutral-charged exciton splitting, and positive-negative trion splitting. These three characteristic energies are an order of magnitude lower than the direct exciton binding energy.

Automated summary

The study observed sharp exciton peaks in the photoluminescence spectra of monoatomic carbon chains stabilized by gold nanoparticles on a glass substrate. Characteristic energies of excitonic transitions in this quasi-one-dimensional nanosystem were estimated using the variational method, showing an interplay between various energies significantly lower than the direct exciton binding energy.