Revealing the Empty-State Electronic Structure of Single-Unit-Cell FeSe/SrTiO3

Dennis Huang, Can Li Song, Tatiana A. Webb, Shiang Fang, Cui Zu Chang, Jagadeesh S. Moodera, Efthimios Kaxiras, Jennifer E. Hoffman

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

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.

Original languageEnglish (US)
Article number017002
JournalPhysical review letters
Volume115
Issue number1
DOIs
StatePublished - Jul 2 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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