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Asymmetrical horizontal interdot coupling was demonstrated to exist in asystem of a single plane of self-assembled CdTe/ZnTe quantum dots.Photoluminescence excitation (PLE), second order photon correlation and opticalorientation were used as main experimental tools. Each individual absorbing dotwas identified by a sharp PLE resonance, assigned to neutral excitontransition, while the corresponding emission contained several excitonictransitions of different charge states in another single quantum dot differentfrom the absorbing one. Energy and spin transfer dynamics were studied. A highefficiency of spin transfer was found from optical orientation in a verticalmagnetic field (70%) as well as without the magnetic field (40%), in spite of asignificant anisotropic exchange splitting of the absorbing dot. Coherentmechanism of linear-to-circular polarization conversion was identified, with anefficiency (43%) close to the theoretical limit of 50%.

Optically induced energy and spin transfer in non-resonantly coupled pairs of self-assembled CdTe/ZnTe quantum dots