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When the n=1(ground) state of quantum dots is resonantly pumped, a “non-degenerate” biexciton composed of an n=1 and n=2(excited) states-pair may be observed with pump-probe spectroscopy. We observed this resonance and measured 15-meV binding energy in In0.4Ga0.6As self-organized quantum dots, consistent with theoretical calculations.
© 2004 Optical Society of America
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