We have calculated the electronic structure of spherical PbS, PbSe, and PbTe quantum dots using a fourband envelope-function formalism that accounts for band anisotropy. By comparing our results with an analytical calculation that assumes a spherical approximation of the k ជ •p ជ Hamiltonian, we show that the effects of band anisotropy are more pronounced for the excited states and increase with the confinement. We also show how the same technique can be applied to ellipsoidal quantum dots.

Articles you may be interested inTemperature dependence of electronic energy transfer in PbS quantum dot films Appl. Phys. Lett. 95, 083102 (2009); 10.1063/1.3213349 PbTe and SnTe quantum dot precipitates in a CdTe matrix fabricated by ion implantation

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Error-free pseudolinear transmission of 80 Gbit=s single-channel data over 840 km of standard fibre without optical regeneration, forwarderror correction or polarisation control is described. Gated autocorrelation and spectral measurements reveal that the performance is limited primarily by the optical signal-to-noise ratio, rather than dispersion or nonlinearity. Conclusions: We have demonstrated the successful transmission of 80 Gbit=s single-channel data over 840 km of conventional fibre without using any manual polarisation control or tracking in the transmitter or receiver. When the dispersion is fully compensated for, the performance is observed to be primarily limited by the attainable optical signal-to-noise ratio at the receiver.

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