Revealing the Empty-State Electronic Structure of Single-Unit-Cell FeSe/SrTiO[subscript 3]

• Main Authors: Huang, Dennis (Author), Song, Can-Li (Author), Webb, Tatiana A. (Author), Fang, Shiang (Author), Kaxiras, Efthimios (Author), Hoffman, Jennifer E. (Author), Chang, Cui-zu (Contributor), Moodera, Jagadeesh (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Plasma Science and Fusion Center (Contributor), Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology) (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2015-07-06T12:23:09Z.
• Subjects: Article
• Online Access: Get fulltext

We use scanning tunneling spectroscopy to investigate the filled and empty electronic states of superconducting single-unit-cell FeSe deposited on SrTiO[subscript 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 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.
National Science Foundation (U.S.) (STC Center for Integrated Quantum Materials Grant DMR-1231319)
National Science Foundation (U.S.) (STC Center for Integrated Quantum Materials Grant DMR-0847433)
Gordon and Betty Moore Foundation (EPiQS Initiative Grant GBMF4536)