Control of fine-structure splitting of individual InAs quantum dots by rapid thermal annealing

Details Control of fine-structure splitting of individual InAs quantum dots by rapid thermal annealing Control of fine-structure splitting of individual InAs quantum dots by rapid thermal annealing

2006-12-06

arxiv.org/abs/quant-ph/0612047v1

Physics

Quantum Physics

12 pages, 3 figures. Accepted for publication in Applied Physics Letters

Scientific paper

Degeneracy of the bright single exciton spin state is a prerequisite for the production of triggered polarization-entangled photon pairs from the biexciton decay of a quantum dot. Normally, however, the exciton spin states are split due to in-plane asymmetries. Here we demonstrate that the exciton splitting of an individual dot can be tuned through zero by thermal annealing. Repeated annealing blueshifts the exciton emission line of the dot, accompanied by a reduction and inversion in polarization splitting. Annealing is also demonstrated to control the detuning between the exciton and biexciton transitions in any selected dot.

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