Inelastic x-ray scattering in heterostructures: electronic excitations in LaAlO<inf>3</inf>/SrTiO<inf>3</inf>

Kari O. Ruotsalainen, Christoph J. Sahle, Tobias Ritschel, Jochen Geck, Masayuki Hosoda, Christopher Bell, Yasuyuki Hikita, Harold Y. Hwang, Tim T. Fister, Robert A. Gordon, Keijo Hämäläinen, Mikko Hakala, Simo Huotari, Chris Bell

Research output: Contribution to journalArticle (Academic Journal)peer-review

7 Citations (Scopus)


We present an investigation of the valence-electron excitation spectra including the collective plasmon modes of SrTiO<inf>3</inf>, LaAlO<inf>3</inf> and their heterostructures with non-resonant inelastic x-ray scattering. We analyse the spectra using calculations based on first principles and atomic multiplet models. We demonstrate the feasibility of performing valence IXS experiments in a total reflection geometry. Surprisingly, we find that the plasmon, interband and semicore excitations in multilayers are well described as a superposition of bulk-compound spectra even in a superstructure composing of layers of only one atomic layer thickness.

Original languageEnglish
Article number335501
JournalJournal of Physics Condensed Matter
Issue number33
Publication statusPublished - 26 Aug 2015


  • Electronic structure
  • Heterostructures
  • Inelastic x-ray scattering


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