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Remarkably different characteristics were found on isolated and close-packed self-assembled In 0.4 Ga 0.6 As/GaAs (311)B quantum dots (QDs). Sub-peaks superimposed on the regular Gaussian photoluminescence (PL) peak were observed in a close-packed QD array, in contrast to the single Gaussian PL peak in an isolated one. A tunneling-current peak in an isolated QD...
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