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Electric field dependence of the exciton photon energy for (a) sample A, (b) sample B, (c) sample C, and (d) sample D showing the parabolic Stark shift of the exciton emission energy, from which the Stark parameters pX and βX are extracted, of a typical QD selected randomly from each sample. The lower panels show the magnitude of the fine structure splitting, |s|, for (e) sample A, (f) sample B, (g) sample C, and (h) sample D illustrating the linear shift in |s|, from which is extracted, of three typical QDs in each sample.
Observation of avoided crossings in the neutral exciton states of quantum dots tuned with electric field. (a), (b), and (c) magnitude of the fine structure splitting, |s|, in a single QD from samples A, B, and D, respectively, as a function of electric field. In each case the minimum value of |s| is approximately 2 μeV and so is sufficient to show entangled photon emission. (d), (e), and (f) show the corresponding orientation of the eigenstates, relative to the  crystalline axis, as the QDs are tuned through their minimum |s|.
Summary of the behavior of the exciton emission energy and fine structure splitting of QDs in each of the four sample types, A, B, C, and D. For all parameters, the value given is the mean average over all the QDs studied in the corresponding type. The columns contain the exciton emission energy, E 0 X; Stark shift parameters, z-dipole moment, p X, and polarizability, βX; fine structure splitting at zero electric field, s(F = 0); and the rate at which the fine structure splitting is tuned with electric field, .
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