界面超导硒化铁/钛酸锶异质结的电声相互作用研究

项目名称： 界面超导硒化铁/钛酸锶异质结的电声相互作用研究

项目编号： No.11504230

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 管丹丹

作者单位： 上海交通大学

项目金额： 24万元

中文摘要： 申请人在新奇材料的角分辨光电子能谱研究方面有丰富的经验，迄今发表SCI论文22篇，其中第一作者文章3篇，单篇最高引用超过100次。.铁基超导体是继铜氧化合物高温超导体后被发现的又一类新型高温超导材料，它的发现为高温超导电性研究开辟了一个全新的研究方向。高温超导的物理机理是当今物理学的研究热点之一。电-声相互作用被认为与库仑作用一样在铁基超导中起重要作用，而界面超导FeSe/SrTiO3结构简单且超导临界温度极高，是一个理想的研究体系。本项目拟采用分子束外延在SrTiO3上制备单层FeSe薄膜，以原位的角分辨光电子能谱和拉曼光谱来研究超导薄膜的表面态、电-声相互作用以及各声子模式在电声子耦合中的贡献，揭示界面对高温超导电性的影响，从而构建更理想的界面超导结构，为后续工作打下基础。本项目的开展有助于对界面超导物理机制的理解，进而揭示高温超导的物理奥妙，为寻找更高转变温度的超导材料提供科学依据。

中文关键词： 电-声相互作用；薄膜；界面效应；角分辨光电子能谱；拉曼光谱

英文摘要： The applicant focuses on utilizing angle-resolved photoemission spectroscopy to characterize the electronic properties of novel materials such as topological insulators and graphene, including electron-phonon interactions, spin-orbit interactions and consequences of broken symmetry environments. There are 22 publications until now, three of which are published as the first author, and one of them is being cited more than 100 times..Iron-based superconductors are the second-highest-temperature superconducting material family known to date after the cuprates, these materials have opened new directions for the research of high-temperature superconductivity (HTS), which have attracted great interests. The electron-phonon interaction should play an important role in the superconducting mechanism. To better understand the superconductivity in HTS, the study of its electron-phonon interaction and phonon modes is highly desirable. Interface superconductivity FeSe/SrTiO3 heterostructure is an ideal system for studying the superconductivity of iron-based superconductors since the structure is simple and the superconducting transition temperature (Tc) is very high. In this project, monolayer FeSe film is proposed to be grown on SrTiO3 by molecular beam epitaxial, and in situ angle-resolved photoemission spectroscopy and Raman spectroscopy will be used to study the surface electronic properties, electron-phonon interaction, and the contributions of phonon modes. The main aim of this project is to reveal how the interface effects influence their superconductivity, and then help build an interface superconductivity structure with higher Tc for further research. The research of this project will be helpful for understanding the mechanism of iron-based superconductors, and then revealing the mystery of high Tc superconductivity by analyzing the difference and similarity with cuprates. This will help the discovery and design of other superconductors with higher Tc.

英文关键词： electron-phonon interaction;thin film;interface effect;angle-resolved photoemission spectroscopy;Raman spectroscopy