We studied monatomic linear carbon chains stabilized 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 and 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 nonradiative 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.

Kutrovskaya, S., Osipov, A., Baryshev, S., Zasedatelev, A., Samyshkin, V., Demirchyan, S., et al. (2020). Excitonic fine structure in emission of linear carbon chains. NANO LETTERS, 20(9), 6502-6509 [10.1021/acs.nanolett.0c02244].

Excitonic fine structure in emission of linear carbon chains

Pulci, O;Gontrani, L;
2020-01-01

Abstract

We studied monatomic linear carbon chains stabilized 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 and 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 nonradiative 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.
2020
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03 - FISICA DELLA MATERIA
English
carbon chains; excitons; photoluminescence spectra; nanoparticles
Kutrovskaya, S., Osipov, A., Baryshev, S., Zasedatelev, A., Samyshkin, V., Demirchyan, S., et al. (2020). Excitonic fine structure in emission of linear carbon chains. NANO LETTERS, 20(9), 6502-6509 [10.1021/acs.nanolett.0c02244].
Kutrovskaya, S; Osipov, A; Baryshev, S; Zasedatelev, A; Samyshkin, V; Demirchyan, S; Pulci, O; Grassano, D; Gontrani, L; Hartmann, R; Portnoi, M; Kuch...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/275821
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