Observation of dressed excitonic states in a single quantum dot.
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.
Jundt
Gregor
G
Institute of Quantum Electronics, ETH Zurich, CH-8093 Zurich, Switzerland.
Robledo
Lucio
L
Högele
Alexander
A
Fält
Stefan
S
Imamoğlu
Atac
A