Abstract
AbstractFor a single semiconductor quantum dot doped with a single Mn atom we study theoretically the spectral characteristics and dynamics under optical excitation. Because the Mn spin couples to the electron and hole spin of the quantum dot exciton via the exchange interaction, in the absorption spectrum instead of a single exciton line a set of lines appears. Here we consider a quantum dot with one conduction band and one light hole type valence band. Due to this untypical valence band structure a spectrum of twelve lines is seen at zero magnetic field. When a magnetic field is applied, the lines shift, cross and anticross. By an analysis of the corresponding eigenvalues and eigenfunctions as functions of the magnetic field more insight into the spectral behavior can be achieved. The exchange interaction furthermore opens the possibility for ultra fast control of the Mn spin via optical manipulation of the exciton. We analyze whether switching of the Mn spin can be optimized by the application of an external magnetic field. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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