Determination of the surface and interface phase shifts in metallic quantum well structures of perovskite oxides

K. Yoshimatsu, E. Sakai, M. Kobayashi, K. Horiba, T. Yoshida, A. Fujimori, M. Oshima, H. Kumigashira

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We propose an experimental approach to extract separately the surface and interface phase shift of standing waves in metallic quantum well (QW) structures composed of isostructural perovskite oxides. The "asymmetric" vacuum/SrVO3/SrTiO3 and "symmetric" SrTiO 3/SrVO3/SrTiO3 QW structures are fabricated in an epitaxial multilayer form. Using these metallic QW structures, the phase shifts at the surface (vacuum/SrVO3) and interface (SrTiO 3/SrVO3) are successfully obtained by analyzing a thickness series of angle-resolved photoemission spectra. The difference of the phase shift between the two boundaries reveals that nearly ideal quantum confinement is achieved at the interface, indicating that a SrTiO3 layer acts as a useful potential barrier.

Original languageEnglish
Article number115308
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number11
DOIs
Publication statusPublished - 2013 Sep 19
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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