论文标题
胶体纳米片的重塑过程的性质和控制
Nature and Control of Shakeup Processes in Colloidal Nanoplatelets
论文作者
论文摘要
最近的实验表明，CDSE和CDSE/CDS纳米片（NPLS）的光致发光线宽度可以通过来自带负电荷的TRIONS的改换（SU）线的存在来扩展。我们基于有效的质量和配置相互作用（CI）模拟进行理论分析，以确定能够实现此类过程的物理条件。我们确认，胶体NPL中的Trions易感的SU线排成一级，高于外延量子井（通过介电限制）强度强的数量级。对于这些过程，TRINES必须弱绑定到放松对称选择规则的杂质。侧面侧壁上的费用特别有效。我们提出，报告的核/壳CDSE/CDS NPL的宽线宽度不仅与SU过程有关，还与亚稳态自旋三角态有关。了解SU过程的起源为NPL的合理设计提供了较窄的线宽度。
Recent experiments suggest that the photoluminescence line width of CdSe and CdSe/CdS nanoplatelets (NPLs) may be broadened by the presence of shakeup (SU) lines from negatively charged trions. We carry out a theoretical analysis, based on effective mass and configuration interaction (CI) simulations, to identify the physical conditions that enable such processes. We confirm that trions in colloidal NPLs are susceptible of presenting SU lines up to one order of magnitude stronger than in epitaxial quantum wells, stimulated by dielectric confinement. For these processes to take place trions must be weakly bound to off-centered impurities, which relax symmetry selection rules. Charges on the lateral sidewalls are particularly efficient to this end. We propose that the broad line width reported for core/shell CdSe/CdS NPLs may relate not only to SU processes but also to a metastable spin triplet trion state. Understanding the origin of SU processes opens paths to rational design of NPLs with narrower line width.
