单分子磁体耦合超导电极体系的自旋极化输运

项目名称： 单分子磁体耦合超导电极体系的自旋极化输运

项目编号： No.11504260

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 解海卿

作者单位： 太原师范学院

项目金额： 20万元

中文摘要： 在分子自旋电子学领域，由于在存储和处理信息方面有潜在的应用价值，磁各向异性大自旋的单分子磁体自旋输运受到很多关注。磁性分子耦合超导电极体系的电子输运研究处在早期阶段。在本项目中，我们将首先发展处理磁性分子和超导电极耦合体系电子输运的四阶量子主方程，然后运用此方法研究自旋交换作用，磁各向异性，量子隧穿磁化，外加磁场以及铁磁电极自旋极化等对Andreev反射和Josephson电流的影响，阐明如何从电流转变获得分子磁体本身的信息，提出磁性分子输运特性探测的新方案，揭示相关单分子磁体自旋相关输运调控的新机制。这些研究不仅对基础物理有着重要意义，而且也可为设计分子自旋器件提供新思路。

中文关键词： 单分子磁体；自旋极化输运；Josephson流；Andreev反射；主方程

英文摘要： In molecular spintronics, the single-molecule magnet (SMM),characterized by a large spin and uniaxial anisotropy, has potential applications in storing and processing information, and much attention has been received in spin-dependent transport the molecule. The transport through SMM coupled with superconducting electrodes are still at their beginning stage. In this project, first of all we develop an efficient fourth-order quantum master equation to solve the transport through magnetic molecules with superconducting and magnetic leads, then theoretically study the current properties of electron transport through a SMM with the master equation approach. We put emphasis on the effects of the spin-exchange coupling, the magnetic anisotropy, the quantum tunneling of magnetization, the external magnetic field and the spin polarization of magnetic leads on Andreev refection and Josephson current. In our studies, we hope to clarify how to get the intrinsic information of the SMM from the current transition and discovery the new mechanism in the manipulation of spin-dependent transport. The above studies on transport through the SMM are significant for fundamental physics, and can provide the new ideas for the design of molecular spintronic devices.

英文关键词： single-molecule magnet;spin-polarized transport;Josephson current;Andreev reflection;master equation