High-order replica bands in monolayer FeSe/SrTiO₃ revealed by polarization-dependent photoemission spectroscopy.

ABSTRACT: The mechanism of the enhanced superconductivity in monolayer FeSe/SrTiO₃ has been enthusiastically studied and debated over the past decade. One specific observation has been taken to be of central importance: the replica bands in the photoemission spectrum. Although suggestive of electron-phonon interaction in the material, the essence of these spectroscopic features remains highly controversial. In this work, we conduct angle-resolved photoemission spectroscopy measurements on monolayer FeSe/SrTiO₃ using linearly polarized photons. This configuration enables unambiguous characterization of the valence electronic structure with a suppression of the spectral background. We consistently observe high-order replica bands derived from various Fe 3d bands, similar to those

SUBMITTER: Liu C 

PROVIDER: S-EPMC8319137 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature