Electron Transport in Quantum Dots

9501438维斯特福耦合两个和三个量子点，人造分子，包括链和环的点将被制造在砷化镓/铝砷化镓异质结上。半导体上的这种结构将使PI能够补偿杂质和缺陷对电子能量和点对点耦合的影响。库仑阻塞和超低温下的点电容将被用作单量子点和耦合量子点中电子态的光谱工具。其他探测器，如通过小型化带状线的局部微波激发，以及目前正在开发的空间分辨扫描探针测量，将用于表征单点和耦合点中的电子状态和传输。其目的是阐明耦合点中电子态的性质，并寻找可能的集体量子现象。电子在这些结构中的行为是目前人们非常感兴趣的，无论是出于实际原因还是出于根本原因。单电子通过耦合量子点的受控运动是电子学和计算新方法的基础。这个项目研究半导体“量子点”，这种结构如此之小，以至于它们也被称为人造原子和分子。它们的制作很复杂，涉及哈佛大学和加州大学圣巴巴拉分校的工作人员之间的合作。电子在这些结构中的行为是目前人们非常感兴趣的，无论是出于实际原因还是出于根本原因。单电子通过耦合量子点的受控运动是电子学和计算新方法的基础。例如，一个目标是开发单电子设备，其中每个比特由单个电子表示，其状态可以光学切换。与“真正的”分子不同，量子点之间的大小和连接可以通过制造方法来改变，以产生分子中通常不存在的新现象。超低温下库仑阻塞和点电容的测量将被用作单量子点和耦合量子点中电子态的光谱工具。***

9501438 Westervelt Coupled two and three quantum dots, artificial molecules, including chains and rings of dots will be fabricated on gallium- arsenide/aluminum-gallium-arsenide heterostructures from UCSB. Such structures on semiconductors will enable the PI to compensate for the effect of impurities and defects on the energy of the electrons and the dot to dot coupling. Coulomb blockade and dot capacitance at ultra-low temperatures will be used as spectroscopic tools for electron states in single and couple quantum dots. Additional probes such as localized microwave excitation via miniaturized striplines, and spatially resolved scanning probe measurements currently under development will be used to characterize electron states and transport in single and coupled dots. The objective is to elucidate the nature of electron states in coupled dots and to search for possible collective quantum phenomena. The behavior of electrons inside these structures is of great current interest, both for practical and for fundamental reasons. The controlled motion of single electrons through coupled quantum dots is the basis for new approaches to electronics and computation. %%% This project investigates semiconductor "quantum dot", structures which are so small that they are also referred to as artificial atoms and molecules. Their fabrication is complex and involves collaboration between workers at Harvard and UC Santa Barbara. The behavior of electrons inside these structures is of great current interest, both for practical and for fundamental reasons. The controlled motion of single electrons through coupled quantum dots is the basis for new approaches to electronics and computation. For example, a goal is to develop single electron devices in which each bit is represented by a single electron, whose state may be optically switched. Unlike "real" molecules, the size and cou pling between the quantum dots can be varied by fabrication methods to produce new phenomena not normally found in molecules. Measurements of the Coulomb blockade and dot capacitance at ultra-low temperatures will be used as spectroscopic tools for electron states in single and coupled quantum dots. ***