Revealing the Empty-State Electronic Structure of Single-Unit-Cell FeSe/SrTiO${}_3$

Abstract

We use scanning tunneling spectroscopy to investigate the filled and empty electronic states of superconducting single-unit-cell FeSe deposited on SrTiO${}_3$(001). We map the momentum-space band structure by combining quasiparticle interference imaging with decay length spectroscopy. In addition to quantifying the filled-state bands, we discover a $\Gamma$-centered electron pocket 75 meV above the Fermi energy. Our density functional theory calculations show the orbital nature of empty states at $\Gamma$ and suggest that the Se height is a key tuning parameter of their energies, with broad implications for electronic properties.

5 pages, 5 figures

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Cited by in corpus (15)

• Twistronics: Manipulating the Electronic Properties of Two-dimensional Layered Structures through their Twist Angle
• Monolayer FeSe on SrTiO${}_3$
• High-temperature superconductivity in one-unit-cell FeSe films
• Superconductivity across Lifshitz transition and anomalous insulating state in surface K-dosed (Li0.8Fe0.2OH)FeSe
• Dumbbell Defects in FeSe Films: A Scanning Tunneling Microscopy and First-Principles Investigation
• Superconducting (Li, Fe)OHFeSe film of high quality and high critical parameters
• Charge order driven by multiple-Q spin fluctuations in heavily electron-doped iron selenide superconductors
• Observation of robust edge superconductivity in Fe(Se,Te) under strong magnetic perturbation
• Checkerboard order state in superconducting FeSe/SrTiO3(001) monolayer
• Orbital-Selective High-Temperature Cooper Pairing Developed in the Two-Dimensional Limit
• Ubiquitous stripe phase and enhanced electron pairing in interfacial high-Tc superconductor FeSe/BaTiO${}_3$
• Anisotropic gap structure and sign reversal symmetry in monolayer Fe(Se,Te)
• Lateral quantum confinement effect on monolayer high-Tc superconductors
• Sublattice Dichotomy in Monolayer FeSe Superconductor
• Dual Enhancement of Superconductivity in FeSe/SrTiO3 via Orbital and Correlation Synergy