Hydrogen-induced surface metallization of SrTiO 3(001)

M. D'Angelo, R. Yukawa, K. Ozawa, S. Yamamoto, T. Hirahara, S. Hasegawa, M. G. Silly, F. Sirotti, I. Matsuda

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51 Citations (Scopus)


Surface metallization of SrTiO 3(001) by hydrogen adsorption is experimentally confirmed for the first time by photoemission spectroscopy and surface conductivity measurements. The metallic state is assigned to a quantized state in the space-charge layer induced by electron doping from hydrogen atoms. The measured two-dimensional (2D) conductivity is well above the 2D Ioffe-Regel limit indicating that the system is in a metallic conduction regime. The mean free path of the surface electron is estimated to be several nanometers at room temperature.

Original languageEnglish
Article number116802
JournalPhysical review letters
Issue number11
Publication statusPublished - 2012 Mar 16
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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