论文标题
多扬链中的激子能量光谱
Exciton energy spectra in polyyne chains
论文作者
论文摘要
最近，我们在实验上观察到了尖锐的激子峰的特征，该峰值在通过金纳米颗粒稳定并沉积在玻璃基板上的单原子碳链的光致发光光谱中。在这里，我们通过使用变异方法来估计这个复杂的准二维纳米系统中激素转变的特征能。我们表明，实验观察到的激子精细结构的特征能量表受平行碳链形成的范德华准晶体中的跳跃能量之间的相互作用，中性充电的激子拆分和正面负责的trion脱位。这三个特征能比直接激子结合能低一个数量级。
Recently, we have experimentally observed signatures of sharp exciton peaks in the photoluminescence spectra of bundles of monoatomic carbon chains stabilized by gold nanoparticles and deposited on a glass substrate. Here, we estimate the characteristic energies of excitonic transitions in this complex quasi-one-dimensional nano-system with use of the variational method. We show that the characteristic energy scale for the experimentally observed excitonic fine structure is governed by the interplay between the hopping energy in a Van der Waals quasicrystal formed by parallel carbon chains, the neutral-charged exciton splitting and the positive-negative trion splitting. These three characteristic energies are an order of magnitude lower than the direct exciton binding energy.
