Acoustically induced electron spin transport in galium arsenide

自旋电子学利用固体电子学中电子的自旋，正经历着巨大的兴趣激增。利用电子的自旋来表示0和1逻辑位，有望产生更快、更高效的自旋电子设备，并最终形成量子计算机的基础。为了实现这些目标，有效传输和操纵电子自旋的基本材料系统和设备是必要的。以前的半导体研究通常讨论的要么是自旋的输运，要么是对其微观运动的控制很少，要么是使用量子点来限制和局部操纵自旋，而牺牲了限制输运的代价。我的研究将围绕使用独特的动态量子点系统研究自旋输运。动态量子点是由静态电位和由表面声波产生的动态压电电位结合而产生的。表面声波是瑞利波，它在样品表面传播，使表面上的一个点在垂直和纵向上移动。电子自旋可以被限制在动态量子点内，并在远距离上相干传输。研究自旋弛豫机制在运输期间,两个区域是有针对性的。在一个领域，研究将包括通过监测自旋产生的局部磁场来研究每个点上的大量电子自旋（大约100个自旋）。第二项研究将侧重于使单个电子在每个动态量子点内传输，以产生单个光子发射器，其重复频率与表面声波频率（约1 GHz）相当。这个项目特别有趣，因为高频单光子发射器将非常适用于有关量子密码学的工作。在这两个研究领域，利用移动约束势的电子自旋输运将为自旋电子器件的发展和加强加拿大自旋电子学的研究做出重要贡献。

The field of spintronics, which exploits the spin of an electron in solid state electronics, is experiencing a tremendous surge in interest.  Using the spin of the electron to represent the 0 and 1 logic bits is expected to produce faster, more efficient spintronic devices and ultimately form the basis of a quantum computer.  To achieve these goals, basic material systems and devices that efficiently transport and manipulate electron spins are necessary.  Previous studies in semiconductors have typically discussed either the transport of spins with little control of their microscopic movement or the use of quantum dots to confine and manipulate the spins locally at the expense of limiting transport.  My research will centre around the study of spin transport using the unique system of dynamic quantum dots.  Dynamic quantum dots are created by the combination of static potentials with a dynamic piezoelectric potential generated by surface acoustic waves.  Surface acoustic waves are Rayleigh waves that travel on the surface of a sample causing a point on the surface to move in both the vertical and longitudinal directions.  Electron spins can be confined within the dynamic quantum dots and coherently transported over long distances.  To study the spin relaxation mechanisms during transport, two areas are targeted.  In one area, the research will include the study of a large number of electron spins (on the order of 100 spins) in each dot by monitoring the local magnetic field generated by the spins.  The second will focus on enabling the transport of a single electron within each dynamic quantum dot in order to produce a single photon emitter that operates at repetition rates comparable to the surface acoustic wave frequency (approximately 1 GHz).  This project is particularly interesting because a high frequency single photon emitter would be very applicable to work regarding quantum cryptography.  In both research areas, the transport of electron spins using mobile confinement potentials will provide an important contribution to the development of spintronic devices and strengthen spintronics research in Canada.