Journal
PHYSICAL REVIEW LETTERS
Volume 122, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.066802
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Funding
- National Key R&D Program of China [2017YFA0303600, 2017YFA0303503, 2014CB921103]
- National Natural Science Foundation of China [11634016, 11634011, 61434002]
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB07030100]
- Anhui Initiative in Quantum Information Technologies, China [AHY170000]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2016008]
- U.S. NSF [DMR 1608865]
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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.
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