Ultrafast spectroscopy of coupled quantum dots: quantum dot - particle plasmon and quantum dot - quantum dot coupling

耦合量子点的超快光谱：量子点-粒子等离子体和量子点-量子点耦合

• 批准号: 111000798
• 负责人: Professor Dr. Markus Lippitz
• 金额: --
• 依托单位: Institut für Halbleiter- und Festkörperphysik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/111000798?language=en
• 关键词: Ultrafast; spectroscopy; coupled; quantum; dots

A single quantum dot as a solid-state implementation of an atom-like system can be used as asingle-photon source or as a qbit for quantum computing. However, the later application willrequire interfacing the quantum dot to other systems like neighbouring quantum dots (forquantum computing) or plasmonic structures (to transport signals on the nano-scale). Thewell-controlled coupling by exact positioning of quantum structures is subject of the wholefocused research group. As the intrinsic time constant of a quantum dot's optical excitation isin the order of some 100 picoseconds a natural method to investigate the desired coupling isultrafast optical spectroscopy, which is the subject of this project. It is our goal to answer thefollowing and related questions: Is it possible to use laterally coupled quantum-dot molecules(project 5) as quantum gates? Can we switch the coupling between hyperfine-splitted excitonlines using vertically stacked quantum dots (project 6) on a picosecond timescale? Is it possibleto couple epitaxially grown quantum dots to plasmonic nanoantennas (project 4) withoutquenching the luminescence? We will apply pump-probe spectroscopy and time-resolved single-photon counting on a single nanoobject level to find the answers.

单个量子点作为类原子系统的固态实现，可以作为单光子源，也可以作为量子计算的量子比特。然而，后一种应用将需要将量子点连接到其他系统，如邻近的量子点(用于量子计算)或等离子结构(用于在纳米尺度上传输信号)。通过量子结构的精确定位来很好地控制耦合是整个集中研究小组的主题。由于量子点的光激发的本征时间常数约为100皮秒，研究理想耦合的一种自然方法是超快光学光谱学，这是本项目的主题。我们的目标是回答以下及相关问题：是否有可能将横向耦合的量子点分子(项目5)用作量子门？我们能否在皮秒时间尺度上使用垂直堆叠的量子点(项目6)来切换超精细分裂激子线之间的耦合？是否有可能在不猝灭发光的情况下将外延生长的量子点耦合到等离子体纳米天线(项目4)？我们将在单个纳米物体水平上应用泵浦探测光谱学和时间分辨单光子计数来寻找答案。