Photoinduced insulator-to-metal transition in ZnO Mg0.15 Zn0.85 O heterostructures

A. Tsukazaki, A. Ohtomo, M. Nakano, M. Kawasaki

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13 Citations (Scopus)

Abstract

We report on the persistent photoconductivity accompanied with a steep insulator-to-metal transition at low temperatures in ZnO Mg0.15 Zn0.85 O heterostructures. The photoexcited electrons were confined in the ZnO adjacent to the Mg0.15 Zn0.85 O to form a two-dimensional electron gas (2DEG). The electron density was controlled either by the power or number of ultraviolet laser pulses (266 nm wavelength) irradiated to the sample. The 2DEG exhibits Shubnikov-de Haas oscillation in magnetoresistance, whose oscillation periods coincide with the electron density evaluated by Hall effect measurements.

Original languageEnglish
Article number052105
JournalApplied Physics Letters
Volume92
Issue number5
DOIs
Publication statusPublished - 2008

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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