Engineering the hole confinement for CdTe-based quantum dot molecules
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw (Poland)
- Facility for Electron Microscopy and Sample Preparation, Center for Microelectronics and Nanotechnology, Faculty of Mathematics and Natural Sciences, University of Rzeszów, ul. Pigonia 1, 35-959 Rzeszów (Poland)
We demonstrate an efficient method to engineer the quantum confinement in a system of two quantum dots grown in a vertical stack. We achieve this by using materials with a different lattice constant for the growth of the outer and inner barriers. We monitor the resulting dot morphology with transmission electron microscopy studies and correlate the results with ensemble quantum dot photoluminescence. Furthermore, we embed the double quantum dots into diode structures and study photoluminescence as a function of bias voltage. We show that in properly engineered structures, it is possible to achieve a resonance of the hole states by tuning the energy levels with electric field. At the resonance, we observe signatures of a formation of a molecular state, hybridized over the two dots.
- OSTI ID:
- 22412926
- Journal Information:
- Journal of Applied Physics, Vol. 117, Issue 22; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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