Ultranarrow homogeneous broadening of confined excitons in quantum dots: Effect of the surrounding matrix
Ultranarrow homogeneous broadening of confined excitons in quantum dots: Effect of the surrounding matrix
复制标题
量子点中受限激子的超窄均匀展宽：周围基质的影响
DOI：
10.1103/physrevb.61.12662
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发表时间：
2000
影响因子：
3.7
通讯作者：
Y. Masumoto
中科院分区：
文献类型：
--
作者：
M. Ikezawa;Y. Masumoto
利用累积光子回波研究了CuCl量子点中z3激子的超狭均质线宽。研究了CuCl量子点在铝硼硅酸盐玻璃和NaCl晶体两种基质中的嵌入。低温时最窄的均匀线宽为1 μ eV。两种样品均质线宽的温度依赖性相似，均在5 K以上，但在较低温度区域，两者之间存在显著差异。结果表明，在低温条件下，基体对量子点中受限激子的消相过程有一定的影响。观察到的温度依赖性可以用量子点中的受限声子和矩阵中的二能级系统的贡献来解释。
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 μ 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.