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Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
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Enhanced Superconducting State in FeSe/SrTiO_{3} by a Dynamic Interfacial Polaron Mechanism
Shuyuan Zhang1,2, Tong Wei3, Jiaqi Guan1,2
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Physical Review Letters
|March 2, 2019
Summary
Single-layer FeSe films on SrTiO3 show enhanced superconductivity due to interfacial polarons. This electron-boson interaction, driven by lattice distortions, explains the superconductivity boost in these materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Enhanced superconductivity in single-layer FeSe films on SrTiO3 is a significant area of research.
- Understanding the underlying electron-boson interaction is crucial for explaining this phenomenon.
Purpose of the Study:
- To investigate the electron-boson interaction in FeSe/SrTiO3 systems.
- To elucidate the mechanism behind the enhanced superconductivity.
Main Methods:
- Inelastic electron scattering spectroscopy (IESS).
- Angle-resolved photoemission spectroscopy (ARPES).
Main Results:
- Electrons are dressed by lattice distortions of SrTiO3, forming dynamic interfacial polarons.
- A polaronic plasmon mode correlated with SrTiO3 surface phonons was observed.
- Interfacial polaron-polaron interactions were identified as key to superconductivity enhancement.
Conclusions:
- The study reveals dynamic interfacial polarons as the mediators of enhanced superconductivity.
- The findings provide a microscopic model for superconductivity in FeSe/SrTiO3 systems.
- This work clarifies the role of electron-boson coupling in interfacial superconductivity.
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