2012年，我国科学家率先发现外延于SrTiO3衬底上单层FeSe薄膜具有十倍于体态值的超导能隙，意味着其超导转变温度可能超过液氮温度(77 K)。然而，至今还没有直接的实验证据，即零电阻和绝对抗磁性，确切证实FeSe/SrTiO3在液氮温区就进入宏观超导态。在本项目中，我们将利用掺杂、场效应、和人工构建三明治结构(双界面)等方法对FeSe/SrTiO3界面超导性质进行调控，通过原位扫描隧道显微镜和原位输运测量对其超导特性进行表征，期望获得超过液氮温区的界面超导体系。同时，我们还将在单层FeSe表面外延生长Bi2Se3族拓扑绝缘体材料，获得原子级平整、排列有序的拓扑绝缘体/超导异质结构，探索拓扑超导体和Majorana费米子。本项目的实施将对研究高温超导机理和探索高温超导材料以及拓扑超导体产生巨大推进作用。

In 2012, Chinese scientists discovered that one unit cell FeSe film grown on SrTiO3 substrate has a superconducting gap nearly ten times the gap value of the bulk, showing a signature of superconductivity above the liquid nitrogen temperature (77 K). However, up to date there is no direct proof, such as zero resistance and Meissner effect, to show unambiguously that the FeSe/SrTiO3 interface enters the macroscopic superconducting state at liquid nitrogen temperature. In this project, we plan to modulate the superconductivity of FeSe/ SrTiO3 interface by doping, field effect and dual interface effect (fabricating sandwiched structures) , and to explore FeSe/SrTiO3 interface superconductivity at liquid nitrogen temperature by in-situ scanning tunneling spectroscopy and in-situ transport. Moreover, we will fabricate atomically sharp topological insulator/superconductor interface by epitaxially growing topological insulators such as Bi2Se3 on this single layer FeSe film to search for Majorana Fermions. This project will represent a significant progress in the investigations of the superconducting mechanism and searching for novel high Tc superconductors and topological superconductors.