1303.1122 (Luca Sapienza et al.)

Exciton fine-structure splitting of telecom wavelength single quantum
dots: statistics and external strain tuning    [PDF]

Luca Sapienza, Ralph N. E. Malein, Christopher E. Kuklewicz, Peter E. Kremer, Kartik Srinivasan, Andrew Griffiths, Edmund Clarke, Richard J. Warburton, Brian D. Gerardot

In a charge tunable device, we investigate the fine structure splitting of neutral excitons in single long-wavelength InGaAs quantum dots as a function of external uniaxial strain. Nominal fine structure splittings between 22 and 106 \mu eV are measured and manipulated. We observe varied response of the splitting to the external strain, including positive and negative tuning slopes, different tuning ranges, and linear and parabolic dependences. This behaviour is due to a unique critical stress required to achieve the minimum splitting for each quantum dot. These results are promising for the generation of on-demand entangled photon pairs at telecom wavelengths.

View original: http://arxiv.org/abs/1303.1122