Abstract
Monolayer films of FeSe grown on substrates exhibit significantly higher superconducting transition temperatures than those of bulk FeSe. Interaction of electrons in the FeSe layer with dipolar phonons has been suggested as the cause of the enhanced transition temperature. In this paper we systematically study the coupling of longitudinal-optical phonons to the FeSe electron, including also electron-electron Coulomb interactions at the random phase approximation level. We find that the electron-phonon interaction between FeSe and substrate is almost entirely screened by the electronic fluctuations in the FeSe monolayer, so that the net electron-phonon interaction is very weak and unlikely to lead to superconductivity.
1 More- Received 21 March 2017
- Revised 16 June 2017
DOI:https://doi.org/10.1103/PhysRevB.96.054516
©2017 American Physical Society