自旋流线性电光效应研究

项目名称： 自旋流线性电光效应研究

项目编号： No.11274401

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 佘卫龙

作者单位： 中山大学

项目金额： 80万元

中文摘要： 自旋电子学是近年迅速发展起来的物理学新兴学科。传统电子学着眼于利用电子带电这一物理特性实现信息的存储、处理和传输，而自旋电子学则致力于研究利用电子的自旋来实现相关的功能。电子自旋信息的传输依赖于自旋流。而要实现电子自旋流信息的应用，关键的一步是实现自旋流的探测。另一方面，自旋流还与近年发现的新奇物理现象, 如拓扑绝缘体和自旋霍尔效应等密切相关，所以自旋流探测无论在基础物理还是在实际应用方面都具有重要的意义。自旋流会在传导材料中诱导出非零二阶非线性电极化率。我们注意到，这些非零的二阶非线性电极化率，不仅可以支持倍频、和频、差频等光学混频过程，而且在一定条件下也能导致 Pockels 效应即线性电光效应。据此，本项目提出研究自旋流线性电光效应，探索利用线性电光效应探测自旋流的原理和方法。用线性电光效应探测自旋流与用其它非线性光学方法不同，能用很弱探测光，因此可避免热效应，更具应用潜力

中文关键词： 自旋流；线性电光效应；非局域线性电光效应；光角动量；光力

英文摘要： Spintronics is one of new branches in physics that grew rapidly these years. Different from traditional electronics, which studies the storing, processing and transferring of information based on the character of electron having charge, spintronics investigates how to realize the same aim of information application by means of the spins with electrons. The transmission of information carried by the spins of electrons depends on the spin currents. And the key step for the utilization of this information is to realize the exploration of these spin currents. On the other hand, spin currents are found to be closely related to the new phenomena of physics discovered these years, for example, the phenomena of topological insulators and the Spin Hall Effect. So it is important and significant not only for the practical applications but also for the foundational physics for us to realize the exploration of spin currents. It is known that the spin currents will induce nonzero the second order nonlinear susceptibilities in the materials carrying these spin currents. We note that these induced nonzero the second order nonlinear susceptibilities can support not only the processes of double frequency,sum frequency and difference frequency, but also the Pockels effect. This project presents a proposal to investigate the Pocke

英文关键词： pure-spin-current；linear electro-optic effect；non-local linear electro-optic effect；optical angular momentum；optical force