Isoelectronic quantum dots

像量子阱、量子线和量子点这样的量子结构已经彻底改变了我们对材料电子特性的控制程度，允许我们操纵电荷波函数，远远超出了体系统的可能性。面对传统电子产品集成的限制，这些由数千到数百万个原子组成的结构为创造下一代设备开辟了难得的机会。本文提出的研究重点是由一些同价杂质组成的等电子量子点（IQD），并预测了更大集成的长期需求，旨在开发用于创建原子尺寸器件的新方法。该计划的目标是：促进对控制原子尺度量子点行为的物理的理解，并探索它们相对于更大的量子结构的优势。为了实现第一个目标，我们将使用高分辨率的单点光谱来调查iqd的电子和激子状态，作为等电子杂质性质的函数，组成点的原子数量，以及它们的结构和对称性。在牢固地理解了它们的性质之后，我们将使用iqd来演示几个有前景的应用程序。例如，我们提出利用电子与量子点结合的独特特性来实现门控单自旋存储器：这种存储器可以通过光学定向技术进行写入，通过隔离电场实现存储，最后从发射光子的偏振中读取存储器。对智商指标的研究很少，但有很大可能取得重大发现。除了获得的基础知识，这项研究应该为原子电子学的发展开辟新的机会，这一主题注定在不久的将来成为一个突出和非常活跃的研究领域。

Quantum structures like quantum wells, wires, and dots have revolutionized the amount of control we have over electronic properties of materials by allowing us to manipulate the electric charge wavefunctions far beyond what is possible in bulk systems. Faced with a limit to the integration of conventional electronics, these structures, composed of thousands to millions of atoms have opened up exceptional opportunities for the creation of the next generation of devices. The research proposed here focuses on Isoelectronic Quantum Dots (IQD) composed of a few isovalent impurities and, anticipating long-term needs for ever larger integration, aims at developing new approaches for the creation of atomic-size devices. The objectives of this program are: To advance the understanding of the physics governing the behavior of atomic-scale quantum dots and to explore their advantages with respect to larger quantum structures. To achieve the first objective, we will use high-resolution single dot spectroscopy to survey the electronic and excitonic states of IQDs as a function of the nature of the isoelectronic impurity, the number of atoms composing the dot, and their configuration and symmetry. After having established a firm understanding of their properties, we will use IQDs to demonstrate several promising applications. For example, we propose using the unique characteristics of the binding of an electron to an IQD to achieve a gate-controlled single-spin memory: This memory can be written through the technique of optical orientation, storage is achieve with a segregating electric field, and finally, the memory is read from the polarization of the emitted photon. IQDs have been very little studied and offer great potential for significant findings. Aside from the fundamental knowledge gained, this research should open up new opportunities for the development of atomic electronics, a topic destined to become a prominent and very active research field in the near future.