Excitonic fine structure in emission of linear carbon chains

Stella Kutrovskaya; Anton Osipov; Stepan Baryshev; Anton Zasedatelev; Vlad Samyshkin; Sevak Demirchyan; Olivia Pulci; Davide Grassano; Lorenzo Gontrani; Richard R. Hartmann; Mikhail E. Portnoi; Alexey Kucherik; Pavlos Lagoudakis; Alexey Kavokin

doi:10.1021/acs.nanolett.0c02244

arXiv · 1910.09797

Excitonic fine structure in emission of linear carbon chains

Stella Kutrovskaya·Anton Osipov·Stepan Baryshev·Anton Zasedatelev·Vlad Samyshkin·Sevak Demirchyan·Olivia Pulci·Davide Grassano·Lorenzo Gontrani·Richard R. Hartmann·Mikhail E. Portnoi·Alexey Kucherik·Pavlos Lagoudakis·Alexey Kavokin

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Abstract

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.

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Stella Kutrovskaya, Anton Osipov, Stepan Baryshev, Anton Zasedatelev, Vlad Samyshkin, Sevak Demirchyan, Olivia Pulci, Davide Grassano, Lorenzo Gontrani, Richard R. Hartmann, Mikhail E. Portnoi, Alexey Kucherik, Pavlos Lagoudakis, Alexey Kavokin. 2019-10-22. Excitonic fine structure in emission of linear carbon chains. https://doi.org/10.1021/acs.nanolett.0c02244

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