Imaging the evolution of d states at a strontium titanate surface

Ikutaro Hamada, Ryota Shimizu, Takeo Ohsawa, Katsuya Iwaya, Tomihiro Hashizume, Masaru Tsukada, Kazuto Akagi, Taro Hitosugi

研究成果: Article査読

11 被引用数 (Scopus)


Oxide electronics is a promising alternative to the conventional silicon-based semiconductor technology, owing to the rich functionalities of oxide thin films and heterostructures. In contrast to the silicon surface, however, the electronic structure of the SrTiO3 surface, the most important substrate for oxide thin films growth, is not yet completely understood. Here we report on the electronic states of a reconstructed (001) surface of SrTiO3 determined in real space, with scanning tunneling microscopy/spectroscopy and density functional theory calculations. We found a remarkable energy dependence of the spectroscopic image: Theoretical analysis reveals that symmetry breaking at the surface lifts the degeneracy in the t2g state (dxy, dyz, and dzx) of Ti 3d orbitals, whose anisotropic spatial distribution leads to a sharp transition in the spectroscopic image as a function of energy. The knowledge obtained here could be used to gain further insights into emergent phenomena at the surfaces and interfaces with SrTiO3.

ジャーナルJournal of the American Chemical Society
出版ステータスPublished - 2014 12月 10

ASJC Scopus subject areas

  • 触媒
  • 化学 (全般)
  • 生化学
  • コロイド化学および表面化学


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