拓扑超导薄膜的外延生长及表征

项目名称： 拓扑超导薄膜的外延生长及表征

项目编号： No.11204182

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 王干

作者单位： 南方科技大学

项目金额： 29万元

中文摘要： 拓扑超导体是指一种同时具有拓扑表面电子能态以及体超导态的特殊固体材料，此种材料所具有的非传统电子配对对称性使其跻身为最有可能的在固体状态上观察到Majorana费米子的材料体系之一。本项目计划采用分子束外延技术研究在传统半导体基底上外延生长拓扑超导薄膜的物理问题。基于分子束外延技术的先进生长工艺，通过原子级别精准的生长及掺杂控制，并且结合原位的表面分析技术及低温输运测量技术，一种有效的拓扑超导薄膜合成技术将被探索及研究。此项工作对于在实验上观察到Majorana费米子具有重要的引导意义，并且将为从器件层面观察及控制拓扑超导体中的非寻常拓扑表面电子态铺平道路。

中文关键词： 分子束外延；拓扑绝缘体；异质结；铁基超导体；输运性质

英文摘要： Topological superconductor is a unique solid material which possesses both non-trivial topological surface states and bulk superconductivity simultaneously. Owing to the nature of the unconventional electron-pair symmetries, topological superconductors are ascending among several promising material systems which the Majorana fermions might be experimentally realized in.In this research, we propose to study the epitaxial growth of topological superconductor thin films on conventional semiconducting substrates via Molecular Beam Epitaxy technique. On the basis of precisely controlling the epitaxial growth and dopant concentration on the atomic level, an effective scheme for synthesizing topological superconducting thin films will be systematically investigated.In addition to the in-situ surface analysis on the as-grown thin films, low-temperature measurement techniques will also be exerted in the related analysis regarding transport properties. This project is of introductory significance in the search of Majorana fermions experimentally. It launches on observing and regulating the unconventional topological surface states in topological superconductors on the device level.

英文关键词： Molecular Beam Epitaxy；topological insulator；heterostructure；iron based superconductor；transport