Excitonic fine structure in emission of linear carbon chains

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.

arXiv comment23 pages, 5 figures

References in corpus (6)

• Confined linear carbon chains: A route to bulk carbyne
• Carbyne from first principles: Chain of C atoms, a nanorod or a nanorope?
• Electrical conductivity measured in atomic carbon chains
• Effect of Metal Element in Catalytic Growth of Carbon Nanotubes
• Carbyne: from the elusive allotrope to stable carbon atom wires
• Quasiparticle and excitonic gaps of one-dimensional carbon chains

Cited by in corpus (3)

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