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 compl...

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Bibliographic Details
Published in:Physical review research 2021-01, Vol.3 (1), p.013071, Article 013071
Main Authors: Kutrovskaya, Stella, Demirchyan, Sevak, Osipov, Anton, Baryshev, Stepan, Zasedatelev, Anton, Lagoudakis, Pavlos, Kavokin, Alexey
Format: Article
Language:English
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Summary: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.
ISSN:2643-1564
2643-1564
DOI:10.1103/PhysRevResearch.3.013071