量子点与超导电极耦合的多端系统中自旋输运问题的研究

项目名称： 量子点与超导电极耦合的多端系统中自旋输运问题的研究

项目编号： No.11304138

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 叶成芝

作者单位： 临沂大学

项目金额： 25万元

中文摘要： 自旋极化输运是自旋电子学的理论基础之一。如何得到完全自旋极化的电流或者纯自旋流一直是自旋极化输运的中心问题。本项目将从理论上研究在半导体量子点与超导电极耦合的多端系统中，如何利用电子和空穴来实现实验上容易实现的纯自旋注入器。（申请人在该方面已经取得了一些研究进展，但所得结果在实验中实现是有困难的。本项目将继续此方面的研究，进一步设计出实验上容易实现的纯自旋流注入器）。本项目还将研究在半导体量子点与超导电极耦合的多端系统中的自旋累积现象。我们将推导出有Andreev反射存在时的shot noise的表达式，在半导体量子点与超导电极耦合的多端系统中，研究电流噪声谱。通过分析电流噪声谱，获得更多关于自旋极化输运的微观机制信息。研究成果可以为自旋电子器件的设计提供理论依据。

中文关键词： 自旋极化；Andreev反射；自旋累积；散粒噪声；

英文摘要： The spin-polarized quantum transport, as a matter of fact, is one of the theoretic foundation of the spintronic devices. How to realize completely spin-polarized current or pure spin-current is always the center matter of spin-polarized quantum transport. In this project, we will investigate theoretically how to realize the pure spin-current injector in the experiment by means of electrons and holes in the multiterminal system formed by semiconductor quantum dots contacted to the superconductor lead. (We have already began the realization of this kind of pure spin-current without net charge current, and have made some progress. But the results is hard to be realized in the experiment. In this project, we will continue this investigation to scheme out the pure spin-current injector which can be realized in experiment easily). In this project, we will investigate the spin accumulation in the multiterminal system formed by semiconductor quantum dots contacted to the superconductor lead. In this project, we will also derive the expression of shot noise to the case when Andreev-reflection occuring, and investigate the shot noise in the multiterminal system formed by semiconductor quantum dots contacted to the superconductor lead. By analyzing the shot noise, the microcosmic mechanism about the spin-polarized transpo

英文关键词： spin polarization；Andreev reflection；spin accumulation；shot noise；