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Influence of Magnetic Field on Dark States in Transport through Triple Quantum Dots

100%
Wrześniewski K., Weymann I.
Acta Physica Polonica A
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2017
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vol. 132
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issue 1
108-111
EN
We theoretically study the electronic transport through a triple quantum dot system in triangular geometry weakly coupled to external metallic leads. By means of the real-time diagrammatic technique, the current and Fano factor are calculated in the lowest order of perturbation theory. The device parameters are tuned to such transport regime, in which coherent population trapping of electrons in quantum dots due to the formation of dark states occurs. The presence of such states greatly influences transport properties leading to a strong current blockade and enhanced, super-Poissonian shot noise. We consider both one- and two-electron dark states and examine the influence of magnetic field on coherent trapping in aforementioned states. When the system is in one-electron dark state, we observe a small shift of the blockade's region, whereas in the case of two-electron dark state, we show that strong magnetic field can lift the current blockade completely.
2
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Coupling of Quantum Dots with Quantum Wells in a System Based on (Cd,Zn,Mg)Te

64%
Połczyńska K., Janik E., Kossacki P., Pacuski W.
Acta Physica Polonica A
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2017
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vol. 132
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issue 2
369-371
EN
Coupled low dimensional structures have potential applications in quantum computing and spintronics. Using molecular beam epitaxy we fabricated three kinds of systems of coupled quantum wells and quantum dots with different energy order: wells at higher energy than dots, resonant structures, and dots at higher energy than wells. By analysis of photoluminescence and reflectivity spectra, we conclude that there is a possibility of effective carrier tunneling between structures, which opens possibility of subsequent testing of spin transfer efficiency.
3
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A quasiclassical approach to strongly correlated quantum dots

64%
Matulis A., Jarema D., Anisimovas E.
Open Physics
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2009
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vol. 7
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issue 4
704-710
EN
The adiabatic approximation and reaction-coordinate method is applied to the quasiclassical description of nanostructures. In a two-electron model quantum dot, the Schrödinger equation is solved in the vicinity of the transition path connecting two equivalent potential-energy minima. The obtained results demonstrate the formation of a Wigner crystallite.
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