A Ge(Si) Quantum Dot Magnetic Exchange Switch

目的是探索一种新的基于自旋的量子点逻辑范式用于磁交换开关的可行性。该器件将利用对磁性的操纵和控制，通过在硅衬底上直接自组装制备磁掺杂硅（Ge）量子点。该项目将证明，用Mn离子掺杂这些点将产生高居里温度（100K）载流子介导的铁磁性，这是这种开关的主要要求。该方法是将Mn离子注入绝缘体上的锗（GOI），确定产生高居里温度铁磁性的掺杂范围，然后通过对准离子和电子束光刻技术对量子点进行可控的Mn掺杂。知识价值：这个项目非常重要，它提供了一条通往革命性开关器件的途径，该开关器件基于我们在尺寸受限的纳米结构中对稀释磁性的了解。量子点的磁性是一个最近有一些理论进展但没有伴随的实验证实的领域。更广泛的影响：半导体电子产品至少是一个1000亿美元的市场，如果成功，这项工作将为半导体路线图的延伸提供新的途径，并具有重大的经济和技术意义。该项目将成为SpINQuEST（量子系统与技术中的自旋）的核心组成部分，SpINQuEST是弗吉尼亚大学的一个伞形中心，提供重要的研究、教育和推广项目，包括固体自旋夏季研究所。基于参与机构的多样性，SpINQuEST项目将极大地增强学生的研究、教育和文化体验。

The objective is to explore the feasibility of a novel spin based quantum dot logic paradigm for a magnetic exchange switch. This device will utilize manipulation and control of magnetism in magnetically doped Si(Ge) quantum dots prepared by direct self assembly onto Si substrates. This project will demonstrate that doping these dots with Mn ions will produce high Curie temperature (100K) carrier mediated ferromagnetism, a primary requirement for such a switch. The approach is to use Mn ion implantation into germanium on insulator (GOI) to determine the range of doping that produces high Curie temperature ferromagnetism, followed by aligned ion and electron beam lithography to controllably Mn dope the quantum dots.Intellectual Merit: This project is very important in providing a pathway to a revolutionary switching device based upon advancing our knowledge of dilute magnetism in dimensionally constrained nanostructures.. Magnetism in quantum dots is an area where there have been some recent theoretical advances but no concomitant experimental confirmations.Broader Impacts: Semiconducting electronics is at least a $100B market, and if successful, this work will provide a new avenue for the extension of the semiconducting roadmap and have significant economic as well as technological implications. This program will be a central component of SpINQuEST (Spins in Quantum Systems and Technology), an umbrella center at UVA which offers significant research, educational and outreach programs, including the Spins in Solids Summer Institute. SpINQuEST programs will greatly enhance the students' research, educational and cultural experiences, based upon the diversity of participating institutions.