Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO3 substrates
Abstract
We study the consequences of an electron-phonon (e-ph) interaction that is strongly peaked in the forward scattering ({q}=0) direction in a two-dimensional superconductor using Migdal-Eliashberg theory. We find that strong forward scattering results in an enhanced T c that is linearly proportional to the strength of the dimensionless e-ph coupling constant {λ }m in the weak coupling limit. This interaction also produces distinct replica bands in the single-particle spectral function, similar to those observed in recent angle-resolved photoemission experiments on FeSe monolayers on SrTiO3 and BaTiO3 substrates. By comparing our model to photoemission experiments, we infer an e-ph coupling strength that can provide a significant portion of the observed high T c in these systems.
- Publication:
-
New Journal of Physics
- Pub Date:
- February 2016
- DOI:
- 10.1088/1367-2630/18/2/022001
- arXiv:
- arXiv:1507.03967
- Bibcode:
- 2016NJPh...18b2001R
- Keywords:
-
- Condensed Matter - Superconductivity
- E-Print:
- Main text 5 pages, 4 figures