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Spatio-Temporal Dynamics of Carrier Capture Processes: Simulation of Optical Signals

100%
Lengers F., Rosati R., Kuhn T., Reiter D.
Acta Physica Polonica A
|
2017
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vol. 132
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issue 2
372-375
EN
We perform simulations of time-resolved optical experiments of carrier-capture processes in a quantum wire-dot system. Scattering of charge carriers with optical phonons of the quantum wire can result in transitions from the continuum states of the quantum wire to discrete states of the quantum dot. We treat the scattering of carriers with optical phonons within a Lindblad single-particle approach. By considering the coupling of carriers to a light field we are able to simulate pump-probe experiments which are shown to be capable of measuring the captured populations. We further discuss the influence of the Coulomb interaction on the obtained spectra.
2
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Optimal control strategies for coupled quantum dots

100%
Räsänen E., Putaja A., Mardoukhi Y.
Open Physics
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2013
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vol. 11
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issue 9
1066-1073
EN
Semiconductor quantum dots are ideal candidates for quantum information applications in solid-state technology. However, advanced theoretical and experimental tools are required to coherently control, for example, the electronic charge in these systems. Here we demonstrate how quantum optimal control theory provides a powerful way to manipulate the electronic structure of coupled quantum dots with an extremely high fidelity. As alternative control fields we apply both laser pulses as well as electric gates, respectively. We focus on double and triple quantum dots containing a single electron or two electrons interacting via Coulomb repulsion. In the two-electron situation we also briefly demonstrate the challenges of timedependent density-functional theory within the adiabatic local-density approximation to produce comparable results with the numerically exact approach.
3
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A comment on the analogous confinement of a neutral particle to a quantum dot via noninertial effects

88%
Bakke K.
Open Physics
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2012
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vol. 10
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issue 5
1089-1094
EN
In this contribution, we discuss the nonrelativistic limit of the Dirac equation for a neutral particle with a permanent electric dipole moment interacting with external fields in a noninertial frame. We show a case where the geometry of the manifold can play the role of a hard-wall confining potential due to noninertial effects, and can yield bound states analogous to a confinement of the spin-half neutral particle interacting with external fields to a quantum dot described by a hard-wall confining potential [33].
4
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3D self-consistent solution of Poisson and Schrödinger equations for electrostatically formed quantum dot

63%
Machowska-Podsiadło E., Mączka M., Bugajski M.
|
2007
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vol. 55
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issue 2
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