What can we learn from the experiment of electrostatic conveyor belt for excitons?

IF 2.3 4区 物理与天体物理 Q3 PHYSICS, CONDENSED MATTER
T T Zhao, Rui Li, C S Liu
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Abstract

Motivated by the experiment of electrostatic conveyor belt for indirect excitons (Winbowet al2011Phys. Rev. Lett.106196806), we studied the exciton patterns for understanding the exciton dynamics. By analyzing the exciton diffusion, we found that the patterns mainly came from the photoluminescence of two kinds of excitons. The patterns near the laser spot came from the hot excitons which can be regarded as the classical particles. However, the patterns far from the laser spot come from the cooled or coherent excitons. Considering the finite lifetime of Bosonic excitons and of the interactions between them, we built a time-dependent nonlinear Schrödinger equation including the non-Hermitian dissipation to describe the coherent exciton dynamics. The real-time and imaginary-time evolutions were used alternately to solve the Schrödinger equation to simulate the exciton diffusion accompanied by the exciton cooling in the moving lattices. By calculating the escape probability, we obtained the transport distances of the coherent excitons in the conveyor, consistent with the experimental data. The cooling speed of excitons was found to be important in coherent exciton transport. Moreover, the plateau in the average transport distance cannot be explained by the dynamical localization-delocalization transition induced by the disorders.

我们能从激子静电传送带实验中学到什么?
受间接 激子静电传送带实验的启发 [A. G. Winbow, \textit{et al }, Phys.G. Winbow, \textit{et al.}, Phys.\textbf{106}, 196806 (2011)],我们研究激子模式以了解激子 动力学。通过分析激子扩散,我们发现图案 主要来自两种激子的光致发光。靠近激光光斑的图案来自热激子,可视为经典粒子;而远离激光光斑的图案则来自冷却激子或相干激子。考虑到玻色激子的有限寿命以及它们之间的相互作用,我们建立了一个包含非赫米耗散的时变非线性薛定谔方程来描述相干激子动力学。为了模拟移动晶格中伴随激子冷却的激子扩散,我们交替使用实时和虚时演化来求解薛定谔方程。通过计算逃逸概率,我们得到了相干激子在传送带中的传输距离,这与实验数据一致。我们发现激子的冷却速度对相干激子的传输非常重要。此外,平均传输距离的高原现象不能用失调引起的动态局部化-非局部化转变来解释。
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来源期刊
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter 物理-物理:凝聚态物理
CiteScore
5.30
自引率
7.40%
发文量
1288
审稿时长
2.1 months
期刊介绍: Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.
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