Ultranarrow homogeneous broadening of confined excitons in quantum dots: Effect of the surrounding matrix | Zendy

Michio Ikezawa | Zendy; Yasuaki Masumoto | Zendy

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Ultranarrow homogeneous broadening of confined excitons in quantum dots: Effect of the surrounding matrix

Author(s) -

Michio Ikezawa,

Yasuaki Masumoto

Publication year - 2000

Publication title -

physical review. b, condensed matter

Language(s) - English

Resource type - Journals

eISSN - 1095-3795

pISSN - 0163-1829

DOI - 10.1103/physrevb.61.12662

Subject(s) - laser linewidth , quantum dot , dephasing , homogeneous broadening , exciton , homogeneous , condensed matter physics , biexciton , materials science , physics , matrix (chemical analysis) , molecular physics , spectral line , quantum mechanics , doppler broadening , laser , thermodynamics , composite material

Ultranarrow homogeneous linewidth of a Z3 exciton in CuCl quantum dots was studied by using accumulated photon echo. CuCl quantum dots embedded in two kinds of matrices, namely, an alminoborosilicate glass and a NaCl crystal, were studied. The narrowest homogeneous linewidth at low temperature was 1 μeV. The temperature dependence of the homogeneous linewidth was similar, above 5 K for both kinds of samples, but in the lower-temperature region, a remarkable difference was observed between them. It indicates that the matrix definitely affects the dephasing process of a confined exciton in quantum dots at low temperatures. The observed temperature dependence was explained by the contribution of the confined phonon in quantum dots and the two-level system in the matrix

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