Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO3 substrates

Louk Rademaker; Yan Wang; Tom Berlijn; Steve Johnston

doi:10.1088/1367-2630/18/2/022001

Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO₃ substrates

Louk Rademaker, Yan Wang, Tom Berlijn, Steve Johnston

Computational Chemistry and Nanomaterial

Research output: Contribution to journal › Article › peer-review

100 Scopus citations

Abstract

Westudy 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 usingMigdal-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.

Original language	English
Article number	022001
Journal	New Journal of Physics
Volume	18
Issue number	2
DOIs	https://doi.org/10.1088/1367-2630/18/2/022001
State	Published - Feb 10 2016

Funding

We thank E Dagotto, T P Devereaux, D-H Lee, R G Moore, and J Zaanen for useful discussions. LR acknowledges funding from the Dutch Science Foundation (NWO) via a Rubicon Fellowship. TB is supported as a Wigner Fellow at the Oak Ridge National Laboratory. A portion of this research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. CPU time was provided in part by resources supported by the University of Tennessee and Oak Ridge National Laboratory Joint Institute for Computational Sciences(http://jics.utk.edu).

Funders	Funder number
Oak Ridge National Laboratory Joint Institute for Computational Sciences
Office of Science
University of Tennessee
Nederlandse Organisatie voor Wetenschappelijk Onderzoek

Keywords

Eliashberg theory
FeSe thin films
electron-phonon interactions
superconductivity

Access to Document

10.1088/1367-2630/18/2/022001

Cite this

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title = "Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO3 substrates",

abstract = "Westudy 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 usingMigdal-Eliashberg theory. We find that strong forward scattering results in an enhanced Tc that is linearly proportional to the strength of the dimensionless e-ph coupling constant λm 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 Tc in these systems.",

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AB - Westudy 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 usingMigdal-Eliashberg theory. We find that strong forward scattering results in an enhanced Tc that is linearly proportional to the strength of the dimensionless e-ph coupling constant λm 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 Tc in these systems.

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