Spin transport and manipulation in GaAs quantum wells using surface acoustic waves

本项目研究了插入微腔结构中的（in,Ga）As（110）量子阱（QW）在高温（高达室温（RT））下的远距离（≥100 μm）输运和光激发自旋的操纵。这一目标将通过结合(i) iii - v（110）和（111）量子阱的特殊对称性与（ii）窄通道中表面声波压电场控制的双极性电荷输运，以及（iii）使用磁门和电门进行自旋操纵来实现。在项目的前两个阶段，我们已经演示了在超过液氮温度下的自旋输运和操纵。在最后阶段，重点将放在通过自旋轨道相互作用控制自旋的电子门上。除了对自旋动力学的基本认识外，本文介绍的新概念将为自旋电子学在光通信中的应用开辟新的前景。

This projects addresses the long-range (≥ 100 μm) transport and manipulation of photo-excited spins at high temperatures (up to room temperatures (RT)) in (In,Ga)As (110) quantum wells (QW) inserted in microcavity structures. This goal will be achieved by combining (i) the special symmetry of III-V (110) and (111) QWs with (ii) the controlled ambipolar charge transport by the piezoelectric field of surface acoustic waves in narrow channels, and (iii) the use of magnetic and electric gates for spin manipulation. In the two first phases of the project, we have demonstrated spin transport and manipulation at temperatures exceeding liquid nitrogen temperatures. In this last phase, emphasis will be placed on electrical gates for spin control through the spin-orbit interaction. Besides the basic understanding of the spin dynamics, the new concepts introduced here will open new perspectives for applications of spintronics in optical telecommunication.