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Superradiance Effects in the Linear and Nonlinear Optical Response of Quantum Dot Molecules

100%
Sitek A., Machnikowski P.
Acta Physica Polonica A
|
2008
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vol. 114
|
issue 5
1355-1360
EN
We calculate the linear optical response from a single quantum dot molecule and the nonlinear, four-wave-mixing response from an inhomogeneously broadened ensemble of such molecules. We show that both optical signals are affected by the coupling-dependent superradiance effect and by optical interference between the two polarizations. As a result, the linear and nonlinear responses are not identical.
2
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Four-Wave Mixing Spectroscopy of Quantum Dot Molecules

100%
Sitek A., Machnikowski P.
Acta Physica Polonica A
|
2007
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vol. 112
|
issue 2
167-172
EN
We study theoretically the nonlinear four-wave mixing response of an ensemble of coupled pairs of quantum dots (quantum dot molecules). We discuss the shape of the echo signal depending on the parameters of the ensemble: the statistics of transition energies and the degree of size correlations between the dots forming the molecules.
3
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Collective Luminescence and Phonon-Induced Processes in Double Quantum Dots

81%
Machnikowski P., Roszak K., Sitek A.
Acta Physica Polonica A
|
2009
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vol. 116
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issue 5
818-825
EN
We study the evolution of a quantum state of a double quantum dot system interacting with the electromagnetic environment and with the lattice modes, in the presence of a coupling between the two dots. We propose a unified approach to the simulation of the system evolution under joint impact of the two reservoirs. We discuss the sub- and superradiant radiative decay of the system, the phonon-induced decay of entanglement between the dots, and the transfer of excitation between them.
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