title: Quantum-well states in Cu/Fe/Cu(111) coupled to the bulk band through the barrier.
abstract: The quantum-well state (QWS) has been observed on the surface of Cu/Fe/Cu(111). The confinement of the states on the top Cu layers is due to the minority spin barrier of the Fe underlayer. This QWS coexists with the Shockley surface state, which is observed on a clean Cu(111) surface. The resonant behavior of this QWS versus photon energy results from the vertical transition to the unoccupied bulk band, which is possibly due to the coupling between the overlayer Cu and the substrate Cu(111).
authors.affiliation: Advanced Industrial Technology Group, Division of Advanced Technology, Korea Research Institute of Standards and Science, Daejeon 305-600, Korea.
authors.forename: Chanyong
authors.initials: C
authors.lastname: Hwang
authors.forename: Dohyun
authors.initials: D
authors.lastname: Lee
authors.forename: S W
authors.initials: SW
authors.lastname: Han
authors.forename: J S
authors.initials: JS
authors.lastname: Kang