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.
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14 June 2015
Research Article|
June 11 2015
Engineering the hole confinement for CdTe-based quantum dot molecules
Ł. Kłopotowski;
Ł. Kłopotowski
a)
1
Institute of Physics
, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
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P. Wojnar;
P. Wojnar
1
Institute of Physics
, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
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S. Kret
;
S. Kret
1
Institute of Physics
, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
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M. Parlińska-Wojtan;
M. Parlińska-Wojtan
2Facility 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
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K. Fronc;
K. Fronc
1
Institute of Physics
, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
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T. Wojtowicz;
T. Wojtowicz
1
Institute of Physics
, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
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G. Karczewski
G. Karczewski
1
Institute of Physics
, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
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a)
Author to whom correspondence should be addressed. Electronic mail: lukasz.klopotowski@ifpan.edu.pl.
J. Appl. Phys. 117, 224306 (2015)
Article history
Received:
February 09 2015
Accepted:
May 21 2015
Citation
Ł. Kłopotowski, P. Wojnar, S. Kret, M. Parlińska-Wojtan, K. Fronc, T. Wojtowicz, G. Karczewski; Engineering the hole confinement for CdTe-based quantum dot molecules. J. Appl. Phys. 14 June 2015; 117 (22): 224306. https://doi.org/10.1063/1.4922044
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