Abstract
Robust and narrow Aharonov-Bohm (AB) oscillations were observed in magneto-photoluminescence intensity of stacked ZnTe/ZnSe quantum dots (QDs) due to the presence of built-in electric field. A spectral analysis of such AB oscillations allowed for qualitative probing of lateral size of type-II excitons. Two samples grown using different growth sequences were analyzed and compared. The magnetic field value at which the AB transition takes place changed across the spectra for one of the samples, indicating a presence of two distinct QD stacks; a ``double peak'' in the AB oscillation is clearly distinguished in the spectral region where emissions from each stack overlap. The presence of built-in electric field was confirmed by behavior of the PL intensity as a function of temperature.
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