Kutrovskaya Stella, Osipov Anton, Baryshev Stepan, Zasedatelev Anton, Samyshkin Vladislav, Demirchyan Sevak, Pulci Olivia, Grassano Davide, Gontrani Lorenzo, Hartmann Richard Rudolph, Portnoi Mikhail E, Kucherik Alexey, Lagoudakis Pavlos G, Kavokin Alexey
School of Science, Westlake University, Hangzhou 310024, China.
Institute of Natural Sciences, Westlake Institute for Advanced Study, Hangzhou 310024, China.
Nano Lett. 2020 Sep 9;20(9):6502-6509. doi: 10.1021/acs.nanolett.0c02244. Epub 2020 Aug 4.
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.
我们研究了通过附着在其末端并沉积在固体衬底上的金纳米颗粒稳定的单原子线性碳链。我们观察到含有8至24个原子的直链的光谱特征。低温光致发光光谱揭示了不同长度碳链重复出现的特征性三重态精细结构。该三重态总是由一个尖锐的强峰以及位于主峰下方15和40毫电子伏特处的两个较宽的卫星峰组成。我们分别将这些共振解释为边缘态中性激子以及带正电和带负电的三重子。时间分辨光致发光表明，所观察到的准粒子的辐射寿命约为1纳秒，并且它随着链长度的增加而增加。在高温下，由于载流子在平行碳链之间的热跳跃，出现了一个非辐射激子衰变通道。碳链中的激子具有大的振子强度和极低的非均匀展宽。
