Journal
PHYSICAL REVIEW B
Volume 87, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.085312
Keywords
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Funding
- Japan Society for the Promotion of Science (JSPS)
- Council for Science and Technology Policy (CSTP)
- KAKENHI, Japan [21104502, 24540337]
- Grants-in-Aid for Scientific Research [24540337, 23686008, 21104502] Funding Source: KAKEN
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We report on the photoluminescence (PL) properties of MgxZn1-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. DOI: 10.1103/PhysRevB.87.085312
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