Stripe charge ordering in SrO-terminated SrTiO3(001) surfaces

Katsuya Iwaya, Ryota Shimizu, Takeo Ohsawa, Tomihiro Hashizume, Taro Hitosugi

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    15 Citations (Scopus)

    Abstract

    The local electronic structure of the SrO-terminated SrTiO3(001) surface was explored using scanning tunneling microscopy. At low bias voltages in the empty states, a unidirectional structure with a periodicity of three unit cells, superimposed on a c(2×2) reconstructed structure, was found to develop along the crystallographic a axis. This structure indicates a charge-ordered stripe induced by carrier doping from oxygen vacancies in the SrO and the subsurface TiO2 planes. In the filled states, localized deep in-gap states were observed in addition to large energy gaps in the tunneling spectra. This result represents inelastic tunneling due to significant electron-lattice interaction associated with unidirectional lattice distortion in the SrO-terminated surface.

    Original languageEnglish
    Article number125117
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume83
    Issue number12
    DOIs
    Publication statusPublished - 2011 Mar 25

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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