Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO3 substrates
We study the consequences of an electron–phonon (e–ph) interaction that is strongly peaked in the forward scattering ( ${\bf{q}}=0$ ) 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 prop...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2016-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/18/2/022001 |
| Summary: | We study the consequences of an electron–phonon (e–ph) interaction that is strongly peaked in the forward scattering ( ${\bf{q}}=0$ ) 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 ${\lambda }_{m}$ 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 SrTiO _3 and BaTiO _3 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. |
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| ISSN: | 1367-2630 |