Observation of dressed excitonic states in a single quantum dot

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Jundt, Gregor
Robledo, Lucio
Högele, Alexander
Fält, Stefan
Imamoğlu, Atac
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Abstract
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We report the observation of dressed states of a quantum dot. The optically excited exciton and biexciton states of the quantum dot are coupled by a strong laser field and the resulting spectral signatures are measured using differential transmission of a probe field. We demonstrate that the anisotropic electron-hole exchange interaction induced splitting between the x- and y-polarized excitonic states can be completely erased by using the AC-Stark effect induced by the coupling field, without causing any appreciable broadening of the spectral lines. We also show that by varying the polarization and strength of a resonant coupling field, we can effectively change the polarization-axis of the quantum dot.
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Condensed Matter - Mesoscale and Nanoscale Physics
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