Enhanced superconductivity accompanying a Lifshitz transition in electron-doped FeSe monolayer

X. Shi, Z. -Q. Han, X. -L. Peng +8

The origin of enhanced superconductivity over 50 K in the recently discovered FeSe monolayer films grown on SrTiO${}_3$ (STO), as compared to 8 K in bulk FeSe, is intensely debated…