Enhanced lattice polarization in SrTiO3/LaAlO3 superlattices measured using optical second-harmonic generation

N. Ogawa*, K. Miyano, M. Hosoda, T. Higuchi, Chris Bell, Y. Hikita, H. Y. Hwang, Chris Bell

*Corresponding author for this work

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

22 Citations (Scopus)

Abstract

Lattice polarization at the SrTiO3/LaAlO3 interface was investigated by optical second harmonic generation. Superlattices with varying periodicity were employed to study the evolution of interface polarization, while separating substrate contributions. We observed large perpendicular optical nonlinearity, which abruptly increases when the sublattice thickness goes above 3 unit cells. The polarization is primarily in SrTiO3 and develops up to 8 unit cells from the interface.

Original languageEnglish
Article number081106
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume80
Issue number8
DOIs
Publication statusPublished - Aug 2009

Keywords

  • lanthanum compounds
  • optical harmonic generation
  • polarisation
  • strontium compounds
  • superlattices
  • INTERFACE
  • SRTIO3
  • HETEROSTRUCTURES
  • INSULATORS

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