Optical probing of MgZnO/ZnO heterointerface confinement potential energy levels

Creators: Solovyev, V. V.; Van'kov, A. B.; Kukushkin, I. V.; Falson, J.; Zhang, D.; Maryenko, D.; Kozuka, Y.; Tsukazaki, A.; Smet, J. H.; Kawasaki, M.

Abstract

Low-temperature photoluminescence and reflectance measurements were employed to study the optical transitions present in two-dimensional electron systems confined at Mg_xZn_(1–x)O/ZnO heterojunctions. Transitions involving A- and B-holes and electrons from the two lowest subbands formed within the confinement potential are detected. In the studied density range of 2.0–6.5 × 10¹¹ cm⁻², the inter-subband splitting is measured and the first excited electron subband is shown to be empty of electrons.

Additional Information

© 2015 AIP Publishing LLC. (Received 25 December 2014; accepted 10 February 2015; published online 23 February 2015) V.V.S., A.B.V., and I.V.K. thank the Russian Scientific Foundation (Grant No.14-12-00693) for support in developing reflectance measurements on ZnO heterostructures. This work was partly supported by Grant-in-Aids for Scientific Research (S) No. 24226002 from MEXT, Japan, "Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST)," Program from the Japan Society for the Promotion of Science (JSPS) initiated by the Council for Science and Technology Policy.

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