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TT: Fachverband Tiefe Temperaturen

TT 5: Superconductivity: Fe-based Superconductors - FeSe and 122

TT 5.8: Vortrag

Montag, 1. April 2019, 11:30–11:45, H23

Temperature dependence of quasiparticle states in superconducting monolayer FeSe on STO: a theoretical study — •Fabian Schrodi, Alex Aperis, and Peter Oppeneer — Department of Physics and Astronomy, Uppsala University, Sweden

We study the temperature evolution of the quasiparticle bands of the FeSe monolayer on the SrTiO₃ (STO) substrate from 10 to 300 K by applying the anisotropic, multiband and full-bandwidth Eliashberg theory. To achieve this, we extend this theory by self-consistently coupling the chemical potential to the full set of Eliashberg equations. In this way, regardless of the temperature, the electron filling can be kept at a constant level with high accuracy. Solving the coupled equations self-consistently, and with focus on the interfacial electron-phonon coupling, we predict a non-trivial evolution of the global chemical potential. Focusing on the ARPES spectra, we suggest a new route to determine the energy scale of the interfacial phonon mode by measuring the energy position of second-order replica bands. Finally, our results reveal potential implications for the determination of the momentum anisotropy of the superconducting gap in ARPES measurements [1].
F. Schrodi, A. Aperis, P. M. Oppeneer, Phys. Rev. 98, 094509 (2018)