Magneto-photoluminescence of charged excitons from MgxZn 1-xO/ZnO heterojunctions

T. Makino, Y. Segawa, A. Tsukazaki, H. Saito, S. Takeyama, S. Akasaka, K. Nakahara, M. Kawasaki

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We report on the photoluminescence (PL) properties of MgxZn 1-xO/ZnO heterojunctions grown by plasma-assisted molecular-beam epitaxy. Influence of the applied magnetic field (B) on the radiative recombination of the two-dimensional electron gas (2DEG) is investigated up to 54 T. An increase in magnetic field in the range of B ≤ 20 T results in a redshift in the PL. Abrupt lineshape changes in the PL spectra are observed at higher magnetic fields, in correlation with the integer quantum Hall states. We attempt to interpret these features using the conventional model for the 2DEG-related PL based on the transition between the 2DEG and a hole as well as a model taking a bound state effect into account, i.e., a charged exciton. The comparison about the adequateness of these models was made, being in favor of the charged exciton model.

Original languageEnglish
Article number085312
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number8
DOIs
Publication statusPublished - 2013 Feb 20

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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