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

Chong Liu, Ryan P. Day, Fengmiao Li (), Ryan L. Roemer, Sergey Zhdanovich, Sergey Gorovikov, Tor M. Pedersen, Juan Jiang, Sangjae Lee, Michael Schneider, Doug Wong, Pinder Dosanjh, Frederick J. Walker, Charles H. Ahn, Giorgio Levy, Andrea Damascelli, George A. Sawatzky and Ke Zou ()
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Chong Liu: Quantum Matter Institute, University of British Columbia
Ryan P. Day: Quantum Matter Institute, University of British Columbia
Fengmiao Li: Quantum Matter Institute, University of British Columbia
Ryan L. Roemer: Quantum Matter Institute, University of British Columbia
Sergey Zhdanovich: Quantum Matter Institute, University of British Columbia
Sergey Gorovikov: Canadian Light Source
Tor M. Pedersen: Canadian Light Source
Juan Jiang: Yale University
Sangjae Lee: Yale University
Michael Schneider: Quantum Matter Institute, University of British Columbia
Doug Wong: Quantum Matter Institute, University of British Columbia
Pinder Dosanjh: Quantum Matter Institute, University of British Columbia
Frederick J. Walker: Yale University
Charles H. Ahn: Yale University
Giorgio Levy: Quantum Matter Institute, University of British Columbia
Andrea Damascelli: Quantum Matter Institute, University of British Columbia
George A. Sawatzky: Quantum Matter Institute, University of British Columbia
Ke Zou: Quantum Matter Institute, University of British Columbia

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: 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 observed on bare SrTiO3. The intensity of the replica bands is unexpectedly high and different between dxy and dyz bands. Our results provide new insights on the electronic structure of this high-temperature superconductor and the physical origin of the photoemission replica bands.

Date: 2021
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DOI: 10.1038/s41467-021-24783-5

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