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

Abstract

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.

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

References in corpus (5)

• Improved fidelity of triggered entangled photons from single quantum dots
• Polarization-Correlated Photon Pairs from a Single Quantum Dot
• Magnetic-field-induced reduction of the exciton polarization splitting in InAs quantum dots
• Inversion of exciton level splitting in quantum dots
• Tailored quantum dots for entangled photon pair creation

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