Photoinduced insulator-to-metal transition in ZnO/Mg{sub 0.15}Zn{sub 0.85}O heterostructures
- Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)
We report on the persistent photoconductivity accompanied with a steep insulator-to-metal transition at low temperatures in ZnO/Mg{sub 0.15}Zn{sub 0.85}O heterostructures. The photoexcited electrons were confined in the ZnO adjacent to the Mg{sub 0.15}Zn{sub 0.85}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.
- OSTI ID:
- 21016311
- Journal Information:
- Applied Physics Letters, Vol. 92, Issue 5; Other Information: DOI: 10.1063/1.2841044; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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