Excitonic fine structure in emission of linear carbon chains
| Autor: | Mikhail E. Portnoi, Alexey Kavokin, Olivia Pulci, Pavlos G. Lagoudakis, Davide Grassano, A. Osipov, Alexey Kucherik, Lorenzo Gontrani, S. S. Demirchyan, Stepan Baryshev, Anton Zasedatelev, Vlad Samyshkin, R. R. Hartmann, Stella Kutrovskaya |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
excitons Exciton carbon chains Physics::Optics Nanoparticle FOS: Physical sciences Bioengineering 02 engineering and technology nanoparticles photoluminescence spectra 7. Clean energy Monatomic ion Solid substrate General Materials Science Physics - Atomic and Molecular Clusters Carbon chain Condensed Matter - Materials Science Settore FIS/03 Mechanical Engineering Materials Science (cond-mat.mtrl-sci) General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Chemical physics Colloidal gold 0210 nano-technology Atomic and Molecular Clusters (physics.atm-clus) |
| Zdroj: | Nano Letters |
| DOI: | 10.48550/arxiv.1910.09797 |
| Popis: | We studied monoatomic linear carbon chains stabilised by gold nanoparticles attached to their ends and deposited on a solid substrate. We observe spectral features of straight chains containing from 8 to 24 atoms. Low temperature PL spectra reveal characteristic triplet fine-structures that repeat themselves for carbon chains of different lengths. The triplet is invariably composed of a sharp intense peak accompanied by two broader satellites situated 15 and 40 meV below the main peak. We interpret these resonances as an edge-state neutral exciton, positively and negatively charged trions, respectively. The time-resolved PL shows that the radiative lifetime of the observed quasiparticles is about 1 ns, and it increases with the increase of the length of the chain. At high temperatures a non-radiative exciton decay channel appears due to the thermal hopping of carriers between parallel carbon chains. Excitons in carbon chains possess large oscillator strengths and extremely low inhomogeneous broadenings. Comment: 23 pages, 5 figures |
| Databáze: | OpenAIRE |
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