Enhanced Superconducting State in FeSe/SrTiO3 by a Dynamic Interfacial Polaron Mechanism

被引:68
作者
Zhang, Shuyuan [1 ,2 ,3 ]
Wei, Tong [4 ,5 ]
Guan, Jiaqi [1 ,2 ,3 ]
Zhu, Qing [1 ,2 ,3 ]
Qin, Wei [4 ,5 ]
Wang, Weihua [1 ,2 ]
Zhang, Jiandi [6 ]
Plummer, E. W. [6 ]
Zhu, Xuetao [1 ,2 ,3 ,7 ]
Zhang, Zhenyu [4 ,5 ]
Guo, Jiandong [1 ,2 ,3 ,7 ]
机构
[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
[3] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
[4] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Int Ctr Quantum Design Funct Mat ICQD, Hefei 230026, Anhui, Peoples R China
[5] Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei 230026, Anhui, Peoples R China
[6] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70808 USA
[7] Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
HIGH-TEMPERATURE SUPERCONDUCTIVITY; SINGLE-LAYER FESE; MONOLAYER FESE; PHASE-DIAGRAM; T-C; DEPENDENCE; SRTIO3; FILMS; PHOTOEMISSION; STRENGTH;
D O I
10.1103/PhysRevLett.122.066802
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The observation of substantially enhanced superconductivity of single-layer FeSe films on SrTiO3 has 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 SrTiO3, 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 of SrTiO3 in the presence of the FeSe films. A microscopic model is developed showing that the interfacial polaron-polaron interaction leads to the superconductivity enhancement.
引用
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页数:5
相关论文
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