title: Revealing the Empty-State Electronic Structure of Single-Unit-Cell FeSe/SrTiO3.
abstract: We use scanning tunneling spectroscopy to investigate the filled and empty electronic states of superconducting single-unit-cell FeSe deposited on SrTiO3(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 Γ-centered electron pocket 75 meV above the Fermi energy. Our density functional theory calculations show the orbital nature of empty states at Γ and explain how the Se height is a key tuning parameter of their energies, with broad implications for electronic properties.
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Dennis
authors.initials: D
authors.lastname: Huang
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Can-Li
authors.initials: CL
authors.lastname: Song
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.|Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: Tatiana A
authors.initials: TA
authors.lastname: Webb
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Shiang
authors.initials: S
authors.lastname: Fang
authors.affiliation: Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Cui-Zu
authors.initials: CZ
authors.lastname: Chang
authors.affiliation: Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.|Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Jagadeesh S
authors.initials: JS
authors.lastname: Moodera
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.|School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Efthimios
authors.initials: E
authors.lastname: Kaxiras
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Jennifer E
authors.initials: JE
authors.lastname: Hoffman