Doping Evolution of Electronic Structure and Superconductivity in FeSe/SrTiO3 Films
ORAL
Abstract
The latest discovery of high temperature superconductivity in FeSe/SrTiO3 film has attracted extensive attention. Our previous ARPES studies on the single-layer and double-layer FeSe/SrTiO3 films showed that, it is possible to transform single-layer FeSe/SrTiO3 films from N-phase to S phase by vacuum annealing and get superconductivity with a high Tc over 65K. We also showed that it is hard to get double-layer FeSe/SrTiO3 films doped and it remains in the semiconducting/insulating state under an extensive annealing condition. In this talk, we will present our new ARPES results on the FeSe/SrTiO3 films with different layers (1UC, 2UC, 3UC and 20UC), especially for the 3UC-FeSe films. We use another method, potassium deposition, to increase the carrier concentration. As the result, we observed N phase to S phase transformation in FeSe/SrTiO3 films with different layers. This systematic study will provide insight in understanding the evolution of electronic structure and superconductivity from the single-layer FeSe film, to multiple-layer FeSe film and eventually to the bulk FeSe superconductor.
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