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

A. Tsukazaki; A. Ohtomo; M. Nakano; M. Kawasaki

doi:10.1063/1.2841044

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

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

Materials Property Division

Research output: Contribution to journal › Article › peer-review

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 language	English
Article number	052105
Journal	Applied Physics Letters
Volume	92
Issue number	5
DOIs	https://doi.org/10.1063/1.2841044
Publication status	Published - 2008

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2841044

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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.",

author = "A. Tsukazaki and A. Ohtomo and M. Nakano and M. Kawasaki",

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AU - Tsukazaki, A.

AU - Ohtomo, A.

AU - Nakano, M.

AU - Kawasaki, M.

N1 - Funding Information: A.T. was supported by Japan Society for the Promotion of Science fellowship. M.K. thanks for the support from JFE 21 century foundation.

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N2 - 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.

AB - 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.

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

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