时间：7月6日（周一） 下午15:00

地点：勤园20-520

报告摘要：

Despite being a bona-fide bulk insulator, diamond develops an intriguing two-dimensional (2D) p-type surface conductivity when its surface is terminated by hydrogen and exposed to appropriate surface adsorbate layer such as atmospheric water as a result of the surface transfer doping process. Consequently, the surface of diamond presents a versatile platform for exploiting some of the extraordinary physical and chemical properties of diamond, leading to applications such as chemical/biological sensing and the development of high-power and high-frequency field effect transistors (FETs).

In this talk, I will describe our recent work on the surface transfer doping of diamond by transition metal oxides (TMOs). Specifically, I will show that by interfacing diamond with MoO3 or V2O5 a 2D hole conducting layer with metallic transport behaviours arises on diamond. The 2D hole layer affords a surprisingly large spin-orbit interaction giving rise to exotic quantum coherent spin transport properties as revealed by low-temperature magnetotransport. The spin transport can be further tuned by an external electric field in a metal-oxide-semiconductor FETs (MOSFETs) architecture. Lastly, solution-processible approaches for the formation of ultrathin metal-oxide layers on diamond to enable p-channel diamond surface electronics are also explored.

报告人简介：

祁东晨，博士，于2009年获得新加坡国立大学表面科学博士学位。在新加坡担任研究员数年后，他于2013年加入澳大利亚拉筹伯大学，担任物理学讲师。2017年，祁博士荣获澳大利亚研究理事会（ARC）未来研究员奖，致力于高性能金刚石表面电子器件和量子器件的研发。2018年，他加入昆士兰科技大学担任高级讲师，并于2020年晋升为副教授。2023年至2024年，祁博士担任化学与换妻 代理院长。他是澳大利亚物理学会当选会士。祁博士的研究兴趣在于实验凝聚态物理和材料物理领域，专注于在纳米尺度上构建、理解和控制功能材料的表面和界面，以开发用于下一代器件的新技术和材料平台。他尤其致力于利用先进的同步辐射光源研究重要的界面现象和物理机制，这些现象和机制对于基于新兴材料（包括金刚石和有机半导体）的电子器件至关重要。祁博士已在包括Nature Nanotechnology, Nature Materials, Physical Review Letters, Journal of the American Chemical Society, and Advanced Materials在内的国际期刊上发表了190余篇论文，h指数为57。