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(Color online) Field-dependent Stark shifts for the QDs with different In diffusion lengths ( indicates the as-grown structure). We assume that the electric field is along the growth direction, and the lens-shaped QDs are arranged in a tetragonal lattice, as shown in the inset (, , , and ).
(Color online) (a) Dipole and polarizability of interdiffused lens-shaped QDs as a function of In diffusion length obtained from the quadratic fitting of field-dependent Stark shift profiles. The inset shows the ground-state transition energy as a function of In diffusion length when no electric field is applied. (b) The Stark shifts as a function of In diffusion length for different electric fields (, , and ). The solid line represents the positive field, the dashed line represents the negative field, and the unit is kV/cm.
(Color online) Interdiffusion effect on the dipole and polarizability for the three types of isovolume QDs . The pyramidal QD has the aspect ratio .
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