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

  title={Stripe charge ordering in SrO-terminated SrTiO3(001) surfaces},
  author={Katsuya Iwaya and Ryota Shimizu and Takeo Ohsawa and Tomihiro Hashizume and Taro Hitosugi},
  journal={Physical Review B},
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 3 unit cells, superimposed on a c(2 x 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… 

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