Xu Xiaofeng, Zhang Shuyuan, Zhu Xuetao, Guo Jiandong
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
J Phys Condens Matter. 2020 May 27;32(34). doi: 10.1088/1361-648X/ab85f0.
Single-layer FeSe films grown on SrTiO, with the highest superconducting transition temperature () among all the iron-based superconductors, serves as an ideal platform for studying the microscopic mechanisms of high-superconductivity. The significant role of interfacial coupling has been widely recognized, while the precise nature of theenhancement remains open. In this review, we focus on the investigations of the interfacial coupling in FeSe/SrTiOfrom the perspective of electron-phonon coupling (EPC). The main content will include an overview of the experimental measurements associated with different theoretical models and arguments about the EPC. Especially, besides the discussions of EPC based on the measurements of electronic states, we will emphasize the analyses based on phonon measurements. A uniform picture about the nature of the EPC and its relation to theenhancement in FeSe/SrTiOhas still not achieved, which should be the key for further studies aiming to the in-depth understanding of high-superconductivity and the discovery of new superconductors with even enhanced.
在所有铁基超导体中具有最高超导转变温度（ ）的生长在SrTiO上的单层FeSe薄膜，是研究高超导微观机制的理想平台。界面耦合的重要作用已得到广泛认可，但其增强的确切性质仍不明确。在这篇综述中，我们从电子 - 声子耦合（EPC）的角度关注FeSe/SrTiO中界面耦合的研究。主要内容将包括与不同理论模型相关的实验测量概述以及关于EPC的争论。特别是，除了基于电子态测量对EPC的讨论外，我们还将强调基于声子测量的分析。关于FeSe/SrTiO中EPC的性质及其与增强的关系尚未形成统一的认识，这应该是旨在深入理解高超导性和发现甚至具有更高超导性的新超导体的进一步研究的关键。
