Excitonic Fine Structure in Emission of Linear Carbon Chains

Stella Kutrovskaya, Anton Osipov, Stepan Baryshev, Anton Zasedatelev, Vladislav Samyshkin, Sevak Demirchyan, Olivia Pulci, Davide Grassano, Lorenzo Gontrani, Richard Rudolph Hartmann, Mikhail E. Portnoi, Alexey Kucherik, Pavlos G. Lagoudakis, Alexey Kavokin

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)6502-6509
Number of pages8
JournalNano Letters
Volume20
Issue number9
DOIs
Publication statusPublished - 9 Sep 2020

Keywords

  • carbon chains
  • excitons
  • nanoparticles
  • photoluminescence spectra

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