Source Publication (e.g., journal title)
New Journal of Physics
We study the consequences of an electron–phonon (e–ph) interaction that is strongly peaked in the forward scattering () 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 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.
Rademaker, L., Wang, Y., Berlijn, T., & Johnston, S. (2016). Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO3 substrates. New Journal of Physics, 18(2). doi: 10.1088/1367-2630/18/2/022001