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Phys Rev Lett. 2011 Jul 29;107(5):057401. Epub 2011 Jul 25.

Optical stark effect and dressed exciton states in a Mn-doped CdTe quantum dot.

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CEA-CNRS group Nanophysique et semiconducteurs, Institut Néel, CNRS and Université Joseph Fourier, B.P. 166, F-38042 Grenoble Cedex 9, France.


We report on the observation of spin-dependent optically dressed states and the optical Stark effect on an individual Mn spin in a semiconductor quantum dot. The vacuum-to-exciton or the exciton-to-biexciton transitions in a Mn-doped quantum dot are optically dressed by a strong laser field, and the resulting spectral signature is measured in photoluminescence. We demonstrate that the energy of any spin state of a Mn atom can be independently tuned by using the optical Stark effect induced by a control laser. High resolution spectroscopy reveals a power-, polarization-, and detuning-dependent Autler-Townes splitting of each optical transition of the Mn-doped quantum dot. This experiment demonstrates an optical resonant control of the exciton-Mn system.

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