准二维钙钛矿中孤子型室温超荧光诱导的呼吸子

中文摘要 AI 辅助

最近，有人提出了薄钙钛矿薄膜中室温超荧光的孤子机制，并预测在LO声子-激子相互作用下，基本孤子保持稳定。同时，超晶格结构为增强钙钛矿中的超荧光提供了一条途径。受近期在准二维金属卤化物钙钛矿周期性超晶格中观察到室温超荧光的启发，我们将描述Wannier激子-LO声子相互作用的二维非局域非线性薛定谔方程扩展到超晶格结构，得到了三维非局域非线性薛定谔方程。我们表明，层间隧穿产生了呼吸子动力学，对应于混合坐标-动量空间中的稳定基本孤子，其中坐标平行于层，动量垂直于层。呼吸子动力学源于微带形成，微带诱导孤子的动量相关相位调制。在没有层间隧穿的情况下，呼吸子动力学消失，孤子变为静止。这些结果建立了层间隧穿、微带形成和孤子动力学之间的直接联系，表明呼吸子行为可以作为准二维钙钛矿超晶格中层间隧穿的一个特征。

英文摘要

Recently, a soliton mechanism for room-temperature superfluorescence in thin perovskite films has been proposed, with a fundamental soliton predicted to remain stable under LO phonon--exciton interactions. At the same time, superlattice architectures offer a route to enhancing superfluorescence in perovskites. Motivated by recent observations of room-temperature superfluorescence in periodic superlattices of quasi-2D metal-halide perovskites, we extend the 2D nonlocal nonlinear Schrödinger equation describing Wannier exciton--LO phonon interactions to superlattice structures, obtaining a 3D nonlocal nonlinear Schrödinger equation. We show that interlayer tunnelling gives rise to breather dynamics corresponding to a stable fundamental soliton in mixed coordinate--momentum space, with the coordinate parallel to the layers and the momentum perpendicular to them. The breather dynamics originate from miniband formation, which induces a momentum-dependent phase modulation of the soliton. In the absence of interlayer tunnelling, the breather dynamics disappear and the soliton becomes stationary. These results establish a direct connection between interlayer tunnelling, miniband formation and soliton dynamics, suggesting that breather behavior can provide a signature of interlayer tunnelling in quasi-2D perovskite superlattices.

发表机构

• Ioffe Physical-Technical Institute, Russian Academy of Sciences（俄罗斯科学院约费物理技术研究所）
• Holon Institute of Technology（霍隆理工学院）

机构由 AI 辅助整理，请以论文原文为准。

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20 pages, 15 figures