PERSISTENT SPECTRAL HOLE-BURNING IN SEMICONDUCTOR QUANTUM DOTS

Yasuaki Masumoto
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Yasuaki Masumoto: Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 143-150

Abstract: The persistent spectral hole-burning (PSHB) phenomenon was observed in semiconductor quantum dots,CdSe,CuCl, andCuBr, embedded in glass and crystal. In inhomogeneously broadened exciton absorption spectra of these dots, the narrow bleaching hole and its associated structure are made by the narrowband laser excitation and are conserved for more than several hours at 2 K after the laser irradiation. The observation of the PSHB phenomenon in these four kinds of samples shows the generality of the phenomenon in semiconductor quantum dots and requires the existence of more than one ground-state configurations of the total system consisting of quantum dots and surrounding matrix. It means that not only the size distribution but also these ground-state configurations give inhomoge-neous broadening to semiconductor quantum dots. Thermally annealing and light-induced hole-filling phenomena were observed. Hole-burning and hole-filling mechanisms are discussed. Quantum dots consisting of103–104atoms behave like molecules or ions in matrix to give the PSHB phenomenon.

Date: 1996
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DOI: 10.1142/S0218625X96000292

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