Spectroscopy of Indirect Excitons in Vertically Stacked CdTe Quantum Dot Structures |
| K. Kukliński, Ł. Kłopotowski, K. Fronc, P. Wojnar, T. Wojciechowski, M. Czapkiewicz, J. Kossut, G. Karczewski and T. Wojtowicz
Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland |
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| We show that by means of an electric field we can tune the energy levels in vertical quantum dot pairs and study transitions related to recombination of direct and indirect excitons. With decreasing the reverse bias, we observe both the blue- and red-shifted indirect exciton transitions. Based on the band profile of our device, we conclude that the former corresponds to the recombination of the electron and hole localized in the top and the bottom dot, respectively and the latter is related to the recombination of the electron and hole localized in the bottom and the top dot, respectively. |
| DOI: 10.12693/APhysPolA.120.856 PACS numbers: 71.55.Gs, 78.67.Hc, 32.60.+i |