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

Research output: Contribution to journalArticlepeer-review

13 Citations (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.

Original languageEnglish
Pages (from-to)17201-17206
Number of pages6
JournalJournal of the American Chemical Society
Issue number49
Publication statusPublished - 2014 Dec 10


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