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

Article

关键词: HOLE-BURNING SPECTROSCOPY;    ACCUMULATED PHOTON-ECHO;    SEMICONDUCTOR NANOCRYSTALS;    ACOUSTIC PHONONS;    CUCL;    TIME;    MOLECULES;    POLYMERS;   

DOI  :  10.1103/PhysRevB.61.12662

来源: SCIE

【 摘 要 】

Ultranarrow homogeneous linewidth of a Z(3) 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 mu eV. 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.

【 授权许可】

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