Abstract
We report a calculation of the ground state binding energies of the on- and off-axis neutral,D0, and negativelycharged, D−, donors in an oblate lens-shaped InAlAs/GaAlAs quantum dot in the presence of a uniformmagnetic field applied parallel to the dot axis. The calculations have been performed byusing the adiabatic approximation for the electron, a Bastard-type trial function for theD0, and the Hylleraas-type trial function for theD− ion. Novel curves and contour plots for the energies of donors confined in a quantum lens asfunctions of the distance from the axis for several dot heights and magnetic fieldstrengths are presented. We show that under strong magnetic field the on-axisD− ion binding energy becomes larger than the corresponding value of theD0 located in the peripheral region close to the barrier, making possible the formation of on-axisD− centres in equilibrium via electron transfer from the peripheral donor to the on-axisD0.
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