Spin filter, spin amplifier and spin diode in graphene nanodisk
Spin filter, spin amplifier and spin diode in graphene nanodisk
复制标题
DOI：
10.1140/epjb/e2009-00041-7
复制
发表时间：
2009-02-01
影响因子：
1.6
通讯作者：
Ezawa, M.
中科院分区：
文献类型：
--
作者：
Ezawa, M.
石墨烯纳米盘是具有闭合边缘的石墨烯衍生物。尺寸为N的三角锯齿形纳米盘具有N重简并零能态。它可以被解释为具有内部自由度的量子点。纳米盘的基态是准铁磁体，这是一种具有有限但很长寿命的类铁磁体状态。我们研究了由纳米盘和引线组成的系统中的自旋过滤器效应。纳米盘自旋过滤器的一个新特性是其自旋可以由自旋电流控制。本文介绍了自旋电子学在自旋存储器、自旋放大器和自旋二极管等方面的应用。有人认为，自旋电流被加强（整流），通过将其送入纳米盘自旋放大器（二极管）。石墨烯纳米盘是未来电子学和自旋电子学纳米器件的一个有希望的候选者。
Graphene nanodisk is a graphene derivative with a closed edge. The trigonal zigzag nanodisk with size N has N-fold degenerated zero-energy states. It can be interpreted as a quantum dot with an internal degree of freedom. The ground state of nanodisk is a quasi-ferromagnet, which is a ferromagnetic-like state with a finite but very long life time. We investigate spin-filter effects in the system made of nanodisks and leads. A novel feature of the nanodisk spin filter is that its spin can be controlled by the spin current. We propose some applications for spintronics, such as spin memory, spin amplifier and spin diode. It is argued that a spin current is reinforced (rectified) by feeding it into a nanodisk spin amplifier (diode). Graphene nanodisk would be a promising candidate of future electronic and spintronic nanodevices.