论文标题
在位点控制的量子点中，通过两光子激发的biexciton初始化：抗固定状态案例的复杂性
Biexciton Initialization by Two-Photon Excitation in Site-Controlled Quantum Dots: the Complexity of the Antibinding State Case
论文作者
论文摘要
在这项工作中，我们通过共振两种光子激发（111）Biexciton状态人口（111）b面向位置的位点对照INGAAS量子点（QD）。我们表明，激发态重组发出高度纯的单光子对纠缠在极化中。本文讨论的案例由于锥体Ingaas QD的特定能量结构而令人信服，这是一种抗固定的biexciton-具有阳性结合能的状态。我们证明，使用抗固定的biexcitons对QD的共振两光激发会导致复杂的激发型反应场景。我们系统地观察到，共鸣的Biexciton州人口正在与一个激子州的声学辅助人群竞争。这些发现表明，在典型的两光子共振兴奋条件下，确定性的Biexciton状态初始化可能会受到损害。旨在利用抗固定的biexciton的社区成员应考虑这种并发症。
In this work, we present a biexciton state population in (111)B oriented site-controlled InGaAs quantum dots (QDs) by resonant two photon excitation. We show that the excited state recombines emitting highly pure single photon pairs entangled in polarization. The discussed cases herein are compelling due to the specific energetic structure of Pyramidal InGaAs QDs - an antibinding biexciton - a state with a positive binding energy. We demonstrate that resonant two-photon excitation of QDs with antibinding biexcitons can lead to a complex excitation-recombination scenario. We systematically observed that the resonant biexciton state population is competing with an acoustic-phonon assisted population of an exciton state. These findings show that under typical two-photon resonant excitation conditions deterministic biexciton state initialization can be compromised. This complication should be taken into account by the community members aiming to utilise similar epitaxial QDs with an antibinding biexciton.
