Enhanced Superconducting State in FeSe/SrTiO3 by a Dynamic Interfacial Polaron Mechanism
Enhanced Superconducting State in FeSe/SrTiO3 by a Dynamic Interfacial Polaron Mechanism
复制标题
通过动态界面极化子机制增强 FeSe/SrTiO3 超导状态
DOI：
10.1103/physrevlett.122.066802
复制
发表时间：
2019
影响因子：
8.6
通讯作者：
ong
中科院分区：
文献类型：
--
作者：
Zhang Shuyuan;Wei Tong;Guan Jiaqi;Zhu Qing;Qin Wei;Wang Weihua;Zhang Ji;i;Plummer E. W.;Zhu Xuetao;Zhang Zhenyu;Guo Ji;ong
单层FeSe薄膜的超导电性显著增强的观测激发了人们的研究兴趣。目前，关于相应的电子-玻色子相互作用的结论性实验数据仍然缺失。在这里，我们使用非弹性电子散射光谱和角分辨光电子能谱表明，在这些系统中的电子是由强极化晶格畸变的，和不可缺少的非绝热性质，这种耦合导致形成动态界面极化子。此外，极化子的集体运动的结果在极化等离子体激元模式，这是明确相关的FeSe薄膜的存在下的表面声子。微观模型表明，界面极化子-极化子相互作用导致的超导电性增强。
The observation of substantially enhanced superconductivity of single-layer FeSe films onhas stimulated intensive research interest. At present, conclusive experimental data on the corresponding electron-boson interaction is still missing. Here we use inelastic electron scattering spectroscopy and angle resolved photoemission spectroscopy to show that the electrons in these systems are dressed by the strongly polarized lattice distortions of the, and the indispensable nonadiabatic nature of such a coupling leads to the formation of dynamic interfacial polarons. Furthermore, the collective motion of the polarons results in a polaronic plasmon mode, which is unambiguously correlated with the surface phonons ofin the presence of the FeSe films. A microscopic model is developed showing that the interfacial polaron-polaron interaction leads to the superconductivity enhancement.