Coexistence of two-dimensional and three-dimensional Shubnikov-de Haas oscillations in Ar+-irradiated KTaO3

S. Harashima*, C. Bell, M. Kim, T. Yajima, Y. Hikita, H. Y. Hwang, Chris Bell

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

24 Citations (Scopus)

Abstract

We report electron doping in the surface vicinity of KTaO3 by inducing oxygen vacancies via Ar+ irradiation. The doped electrons have high mobility (>10(4) cm(2)/V s) at low temperatures, and exhibit Shubnikov-de Haas oscillations with both two- and three-dimensional components. A disparity of the extracted in-plane effective mass, compared to the bulk values, suggests mixing of the orbital characters. Our observations demonstrate that Ar+ irradiation serves as a flexible tool to study low-dimensional quantum transport in 5d semiconducting oxides.

Original languageEnglish
Article number085102
Number of pages7
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume88
Issue number8
DOIs
Publication statusPublished - 2 Aug 2013

Keywords

  • ELECTRON-GAS
  • SRTIO3
  • SUPERCONDUCTIVITY
  • SURFACE
  • FILMS

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