Hydrogen-induced surface metallization of SrTiO3(001) |
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| Authors: | D'Angelo M Yukawa R Ozawa K Yamamoto S Hirahara T Hasegawa S Silly M G Sirotti F Matsuda I |
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| Affiliation: | Institut des Nanosciences de Paris, Université Pierre et Marie Curie-Paris 6, CNRS-UMR 7588, Paris, France. dangelo@insp.jussieu.fr |
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| Abstract: | Surface metallization of SrTiO3(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. |
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