Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates

Abstract

The enhanced superconductivity in monolayer FeSe on titanates opens a fascinating pathway towards the rational design of high-temperature superconductors. Utilizing the state-of-the-art oxide plus chalcogenide molecular beam epitaxy systems in situ connected to a synchrotron angle-resolved photoemission spectroscope, epitaxial LaTiO3 layers with varied atomic thicknesses are inserted between monolayer FeSe and SrTiO3, for systematic modulation of interfacial chemical potential.With the dramatic increase of electron accumulation at the LaTiO3-SrTiO3 surface, providing a substantial surge of work function mismatch across the FeSe-oxide interface, the charge transfer and the superconducting gap in the monolayer FeSe are found to remain markedly robust. This unexpected finding indicates the existence of an intrinsically anchored magic doping within the monolayer FeSe systems.

References in corpus (6)

• Monolayer FeSe on SrTiO${}_3$
• Universal Substrate Effect on the Superconductivity of FeSe Monolayer Films
• Origin of charge transfer and enhanced electron-phonon coupling in single unit-cell FeSe films on SrTiO3
• Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices
• Ubiquitous strong electron phonon coupling at the interface of FeSe/SrTiO3
• Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates

Cited by in corpus (4)

• Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates
• Interface suppressed nematicity and enhanced superconductivity of FeSe/NdFeO3 in the low doping regime
• Inferior interfacial superconductivity in 1 UC FeSe/SrVO${}_3$/SrTiO${}_3$ with screened interfacial electron-phonon coupling
• Oxide MBE-ARPES at SSRL Beamline 5-2