Excitonic fine structure in emission of linear carbon chains
| Autor: | Kutrovskaya, Stella, Osipov, Anton, Baryshev, Stepan, Zasedatelev, Anton, Samyshkin, Vlad, Demirchyan, Sevak, Pulci, Olivia, Grassano, Davide, Gontrani, Lorenzo, Hartmann, Richard R., Portnoi, Mikhail E., Kucherik, Alexey, Lagoudakis, Pavlos, Kavokin, Alexey |
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| Rok vydání: | 2019 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1021/acs.nanolett.0c02244 |
| 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: | arXiv |
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