Abstract:We here report on an investigation of the differential transmittance of Ge quantum dots, with average radius between 4 and 16 nm, in the subpicosecond time domain. Pump pulses of 390 nm have been used, and the response has been probed in the spectral range 450 to 750 nm, including in this way the E 1 and E 1 D 1 spectral structures, which have a partially excitonic nature. It is shown that the observed features can be essentially explained in terms of (i) occupancy of the conduction states by the photoexcited … Show more
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