Abstract
The electronic states of a (110) surface of a single crystal TiO2 sample were studied in real space with atomic resolution by scanning tunneling spectroscopy. We found that the inversion of the dominant tunneling current site occurs in the positive sample voltage region above 1.9 V. According to the discrete-variational (DV)-Xα calculations of the surface electronic states, atomic alignments observed in the scanning tunneling microscopy image at a higher tunneling bias voltage are of six-fold coordinated titanium ion rows while those at a lower voltage are of five-fold coordinated Ti rows. A broad peak was observed in the empty state region of a differential conductance spectrum, which is considered to originate from the intrinsic surface states of TiO2(110).
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