Excitonic Fine Structure in Emission of Linear Carbon Chains

• DOI: 10.1021/acs.nanolett.0c02244
• Publication Date: 2020-07-30T16:36:54Z
• Authors: Stella Kutrovskaya; Anton Osipov; Stepan Baryshev; Anton Zasedatelev; Vladislav Samyshkin; Sevak Demirchyan; Olivia Pulci; Davide Grassano; Lorenzo Gontrani; Richard Rudolph H...; Mikhail E. Portnoi; Alexey Kucherik; Pavlos G. Lagoudakis; Alexey Kavokin
• Keywords: Monatomic ion; Carbon fibers; Carbon chain; Monatomic gas

We studied monatomic linear carbon chains stabilized by gold nanoparticles attached to their ends and deposited on a solid substrate. observe spectral features of straight containing from 8 24 atoms. Low-temperature PL spectra reveal characteristic triplet fine structures that repeat themselves for different lengths. The is invariably composed sharp intense peak accompanied two broader satellites situated 15 40 meV below the main peak. interpret these resonances as an edge-state neutral exciton positively negatively charged trions, respectively. time-resolved shows radiative lifetime observed quasiparticles about 1 ns, it increases with increase length chain. At high temperatures nonradiative decay channel appears due thermal hopping carriers between parallel chains. Excitons in possess large oscillator strengths extremely low inhomogeneous broadenings.