Solution searching devices that operate on the basis of controlling the spatiotemporal dynamics of excitation transfer via\ndressed photon interactions between quantum dots have been proposed. Long-range excitation transfer based on dressed photon\ninteractions between randomly distributed quantumdots is considered to be effective in realizing such devices.Here,we successfully\ncontrolled the spatiotemporal dynamics of excitation transfer using a Y-junction structure consisting of randomly dispersed\nCdSe/ZnS core-shell quantum dots. This Y-junction structure has two ââ?¬Å?output endsââ?¬Â and one ââ?¬Å?tap end.ââ?¬Â By exciting one output\nend with control light, we observed increased excitation transfer to the other output end via a state-filling effect. Conversely, we\nobserved reduced excitation transfer to the output ends by irradiating the tap end with control light, due to excitation of defect\nlevels in the tap end. These results show the possibility of controlling the optical excitation transfer dynamics between multiple\nquantum dots.
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