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Microelectronics Journal

Entanglement in GaAs and CdSe quantum dots: Exact calculations and DFT approximations

J. P. Coe, Anthony Sudbery, Irene D’Amico

Published Jul 24, 2008• 1 citation
Publisher
DOI
10.1016/j.mejo.2008.06.061

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The energies of 1s states inside and outside the quantum well of a CdSe/ZnS quantum-dot quantum well (QDQW) and the transition dipole moment between these two states have been calculated by effective mass approximation. By using the calculation results, the longitudinal and transversal relaxation times of CdSe/ZnS have been approximated. We obtain a three-pulse photon echo (TPE) signal on the basis of the two states using the optical Bloch equations. We find that there should be four echoes in TPE from our theoretical calculation. In particular, the effects of the variation in core radius and shell thickness have been studied. It has been shown from the numerical calculation that the TPE signal is strongly dependent on the size and structure of the QDQW, and is dominated by relaxation time, which is also dependent on the size and structure.
The energy eigenvalues and eigenfunctions of a core–shell CdSe/ZnS quantum dot structure have been obtained under an effective-mass approximation. The electric transition dipole moment induced by the 1s (inside the well)–1s (outside the well) transition has been calculated. The optical nutation signal induced by the transition has been calculated numerically based on the optical Bloch equations. In particular, the influence of the size variation of the core's radius and the shell's thickness has been studied. It has been shown from the results that the optical nutation signal is sensitive to the size and structure, and that there is an optimal structure and size for the optical nutation phenomenon. The quantum size dependent Rabi frequency and intensity of the optical nutation are also discussed.