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

### Citation:

Huang D, Song C-L, Webb TA, Fang S, Chang C-Z, Moodera JS, Kaxiras E, Hoffman JE. Revealing the Empty-State Electronic Structure of Single-Unit-Cell FeSe /SrTiO3. Physical Review Letters. 2015;115 :017002.
 physrevlett.115.017002.pdf 1.12 MB

### 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.

Last updated on 07/08/2015