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

Liu, Chong; Day, Ryan P.; Li, Fengmiao; Roemer, Ryan L.; Zhdanovich, Sergey; Gorovikov, Sergey; Pedersen, Tor M.; Jiang, Juan; Lee, Sangjae; Schneider, Michael; Wong, Doug; Dosanjh, Pinder; Walker, Frederick J.; Ahn, Charles H.; Levy, Giorgio; Damascelli, Andrea; Sawatzky, George A.; Zou, Ke

doi:10.1038/s41467-021-24783-5

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

Journal Article · 28 July 2021 · Nature Communications

DOI: https://doi.org/10.1038/s41467-021-24783-5 · OSTI ID:1810589

; Day, Ryan P.;

;

; Gorovikov, Sergey;

; Jiang, Juan; Lee, Sangjae;

; Wong, Doug; Dosanjh, Pinder; Walker, Frederick J.; Ahn, Charles H.; Levy, Giorgio;

; Sawatzky, George A.;

Abstract The mechanism of the enhanced superconductivity in monolayer FeSe/SrTiO ₃ 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/SrTiO ₃ 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 3 d bands, similar to those observed on bare SrTiO ₃ . The intensity of the replica bands is unexpectedly high and different between d _xy and d _yz bands. Our results provide new insights on the electronic structure of this high-temperature superconductor and the physical origin of the photoemission replica bands.

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Research Organization:: Yale Univ., New Haven, CT (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019211

OSTI ID:: 1810589

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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