%0 Journal Article %J PHYSICAL REVIEW LETTERS %D 2015 %T Revealing the Empty-State Electronic Structure of Single-Unit-Cell FeSe/SrTiO3 %A Huang, Dennis %A Song, Can-Li %A Webb, Tatiana A. %A Fang, Shiang %A Chang, Cui-Zu %A Moodera, Jagadeesh S. %A Efthimios Kaxiras %A Hoffman, Jennifer E. %X 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 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 explain how the Se height is a key tuning parameter of their energies, with broad implications for electronic properties. %B PHYSICAL REVIEW LETTERS %V 115 %8 JUL 2 %G eng %N 1 %R 10.1103/PhysRevLett.115.017002