硅烯的基础物理研究

项目名称： 硅烯的基础物理研究

项目编号： No.11334011

项目类型： 重点项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 吴克辉

作者单位： 中国科学院物理研究所

项目金额： 320万元

中文摘要： 硅烯是先由理论预言，最近才实验获得的、纯硅构成的类石墨烯材料，因具有类似石墨烯的电子性质以及与现有硅半导体工业的密切关系而受到重视。对这个全新的材料体系，从制备到物性都亟待探索。本项目将硅烯为对象，对其基本物理开展广泛而深入的实验和理论研究。在材料的制备方面，利用分子束外延手段研究硅在不同衬底上的生长规律，探索生长硅烯更好的衬底特别是绝缘衬底材料；利用低温扫描隧道显微镜/扫描隧道谱/光电子能谱等分析手段，对硅烯的电子结构开展深入的研究，揭示其特性以及发现新的量子效应，如对硅烯的超导电性的验证和探索等；同时，开展多种调控电子结构和物性的研究，例如掺杂(p型或n型)、磁性掺杂、吸氢等；开展关于器件的基础研究，如优化表面保护层以获得大气下稳定的硅烯、利用顶栅或背栅调控硅烯的电子浓度和迁移率、与现有硅器件的类比和集成等。同时，在这些研究中实验与理论紧密结合，推动硅烯的理论发展。

中文关键词： 硅烯;电子态;超导;分子束外延;扫描隧道显微镜

英文摘要： Silicene is a pure silicon sheet with graphene-like structure, which has been theoretically proposed and experimentally fabricated only recently. It has attracted great interested because of its graphene-like electronic properties, and compatibility with the current silicon semiconductor industry. In this project we will focus on this new material and conduct in-depth experimental and theoretical investigation. We will first search for new substrates, especially insulating substrates that is suitable for the growth of silicene; Various surface analyzing techniques, such as low temperature scanning tunneling microscopy and spectroscopy (STM/STS)/photoelectron spectroscopy, will be used to investigate the detail electronic structure in silicene, to reveal its unique characteristics and to discover novel quantum effects, including the high Tc superconductivity. We will explore different methods for manipulating the electronic structure and property of silicene, including doping, magnetic doping and hydrogen adsorption. Finally the device fabrication issues will be studied, such as surface capping, gating, and integration into the current devices. In all these studies we will conduct theoretical studies as well as experimental studies, to obtain a comprehensive and in-depth understanding of the physics underneath, and to push the theory of silicene forward.

英文关键词： Silicene;Electron state;superconductivity;molecular beam epitexy;scanning tunneling microscopy