Spin pumping through quantum dots

半导体自旋电子学的一个重要方面是控制半导体中自旋极化载流子的产生和操纵。在纳米级自旋电子器件和量子计算的背景下，人们可能会去相干地操纵几个甚至单个自旋。本项目的主要目的是从理论上分析通过量子点泵送自旋的方案。这种方案的吸引力在于有可能以可控的方式将单个自旋注入半导体，并对它们进行相干操纵。量子点中的库仑相互作用将不可避免地影响纳米级器件中的电子输运。为了找到适合自旋电子应用的自旋泵浦方案，我们开发并应用了描述量子点自旋泵浦的理论工具。

A substantial aspect of semiconductor spintronics is the controlled generation and manipulation of spin-polarized carriers in semiconductors. Both in the context of nanoscopic spintronic devices and quantum computation, one may go down to coherently manipulate a few or even individual spins. The main objective of the present project is to theoretically analyze schemes for pumping spin through quantum dots. The appeal of such a scheme lies in the possibility to inject in a controlled way individual spins into a semiconductor, and manipulating them coherently. An important role will be played by Coulomb interaction effects in the quantum dot, that inevitably affect electronic transport in nanoscopic devices. We develop and apply theoretical tools for describing spin pumping through quantum dots in order to find suitable pumping schemes for spintronic applications.