Abstract
The spectrally resolved FWM signal of CdSe quantum dots with sizes below the bulk excitonic Bohr radius has been studied as a function of temperature and excitation intensity and compared with bulk CdSe. A clear oscillation with a period of 163fs (approximate to 25 meV) is found in the transient FWM signal and attributed to a coherent coupling of confined electron-hole pairs with LO-phonons. Two side bands are observed in the spectrum 25 meV below and above the excitonic resonance. The strong coupling to LO-phonons is observed even at excitation densities around 1 x 10(16) cm(-3) which is close to the bulk value of the Mott density.
Original language | English |
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Journal | IPPS physica status solidi (b) |
Volume | 204 |
Issue number | 1 |
Pages (from-to) | 42-44 |
ISSN | 0370-1972 |
DOIs | |
Publication status | Published - 1997 |