Optical Stark Effect and Dressed Exciton States in a Mn-Doped CdTe Quantum Dot

Claire Le Gall (1) , Adalberto Brunetti (1) , Hervé Boukari (1) , Lucien Besombes (1)

1 NEEL - NPSC - Nanophysique et Semiconducteurs

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.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Claire Le Gall, Adalberto Brunetti, Hervé Boukari, Lucien Besombes. Optical Stark Effect and Dressed Exciton States in a Mn-Doped CdTe Quantum Dot. Physical Review Letters, 2011, 107, pp.057401. ⟨10.1103/PhysRevLett.107.057401⟩. ⟨hal-00684737⟩