Acoustically induced electron spin transport in galium arsenide

利用固态电子学中电子自旋的自旋电子学领域正经历着巨大的兴趣激增。 使用电子的自旋来表示0和1逻辑位有望产生更快，更有效的自旋电子器件，并最终形成量子计算机的基础。 为了实现这些目标，需要有效传输和操纵电子自旋的基本材料系统和设备。 以前的半导体研究通常讨论的是自旋的传输，而对它们的微观运动几乎没有控制，或者使用量子点来限制和操纵自旋，以限制传输为代价。 我的研究将集中在使用动态量子点的独特系统研究自旋输运。 动态量子点是由表面声波产生的动态压电势与静态势相结合而产生的。 表面声波是在样品表面上行进的瑞利波，其导致表面上的点在垂直和纵向方向上移动。 电子自旋可以被限制在动态量子点内，并在长距离上进行相干传输。 为了研究运输过程中的自旋弛豫机制，我们针对两个领域。 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中的大量电子自旋（大约100个自旋）。 第二个将专注于在每个动态量子点内传输单个电子，以产生以与表面声波频率（约1 GHz）相当的重复率操作的单个光子发射器。 这个项目特别有趣，因为高频单光子发射器将非常适用于量子密码学的工作。 在这两个研究领域中，利用移动的限制势传输电子自旋将为自旋电子器件的发展做出重要贡献，并加强加拿大的自旋电子学研究。

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.