Coherent control of a V-type three-level system in a single quantum dot

Details Coherent control of a V-type three-level system in a single quantum dot Coherent control of a V-type three-level system in a single quantum dot

2005-09-16

arxiv.org/abs/cond-mat/0509440v1

Physics

Condensed Matter

Materials Science

Submitted to PRL

Scientific paper

10.1103/PhysRevLett.95.187404

In a semiconductor quantum dot, the Px and Py transitions to the polarization eigenstates, |x> and |y>, naturally form a three-level V-type system. Using low-temperature polarized photoluminescence spectroscopy, we have investigated the exciton dynamics arising under strong laser excitation. We also explicitly solved the density matrix equations for comparison with the experimental data. The polarization of the exciting field controls the coupling between the otherwise orthogonal states. In particular, when the system is initialized into |y>, a polarization-tailored pulse can swap the population into |x>, and vice-versa, effectively operating on the exciton spin.

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