We have studied the lateral carrier transfer in a specially designed quantum dot chain structure by means of time-resolved photoluminescence (PL) and polarization PL. The PL decay time increases with temperature, following the law for the typical one-dimensional quantum system. The decay time depends strongly on the emission energy: it decreases as the photon energy increases. Moreover, a strong polarization anisotropy is observed. These results are attributed to the efficient lateral transfer of carriers along the chain direction.
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We have measured PL intensity under different temperatures, and have found that the PL intensity remains almost unchanged in the temperature range from , indicating that the radiative recombination dominates the PL process at low temperature.