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INFRARED LIGHT CONTROL OF SINGLE-ELECTRON SPIN IN THE NITRIDE QUANTUM DOTS AND ITS APPLICATION

氮化物量子点中单电子自旋的红外光控制及其应用

基本信息

批准号：
14205015
负责人：
KAWASAKI KOJI
金额：
$ 35.69万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

The new operation principle to realize quantum logic gate using GaN and related materials was proposed. A GaN quantum dot structure was obtained by selective area growth method using MBE system. Clear Coulomb blockade phenomena were observed at 6K. The vertical single electron transisters were fabricated for manipulation of single electron spin using infrared light pulses carbon nanotube quantum dots were investigated for realizations of quantum elements. The simple two-electron and four-electron shell structures have been clearly demonstrated in the single-wall carbon nanotube (SWNT) quantum dot, and are observed to be dependent on the level spacing Δ and the level mismatch δ. The exchange interaction has been directly observed as an exchange splitting in the excitation spectroscopy with a large source-drain bias. The single particle state in magnetic fields has shown simple Zeeman splitting without any orbital effect due to a tube diameter that is much smaller than the cyclotron diameter. The large zero-dimensional level spacing has made it possible to observe the simple shell structures in a dot that contains many electrons, and the nanotube quantum dot is shown to be an artificial atom that demonstrates the two-electron system. The present results are an important step toward the realization of the spin-qubit and various entanglement devices in quantum information processing.

提出了用GaN及其相关材料实现量子逻辑门的新工作原理。采用分子束外延（MBE）系统，通过选区生长方法，获得了GaN量子点结构.在6K下观察到明显的库仑阻塞现象。利用红外光脉冲制作了垂直单电子晶体管来操纵单电子自旋，并研究了碳纳米管量子点实现量子元件的可能性。在单壁碳纳米管量子点中，可以清楚地观察到简单的二电子和四电子壳层结构，并且这种结构依赖于能级间距Δ和能级失配δ。交换相互作用已被直接观察到作为一个交换分裂的激发光谱与大的源漏偏置。磁场中的单粒子状态显示出简单的塞曼分裂，由于管直径比回旋加速器直径小得多，没有任何轨道效应。大的零维能级间距使得在含有许多电子的点中观察到简单的壳结构成为可能，并且纳米管量子点被证明是一个演示双电子系统的人造原子。这些结果为实现自旋量子比特和各种纠缠器件在量子信息处理中的应用迈出了重要的一步。