光致发光
激子
量子点
材料科学
同种类的
发光
俘获
吸收(声学)
原子物理学
超快激光光谱学
电子
电子结构
声子
分子物理学
凝聚态物理
物理
光电子学
光学
激光器
量子力学
生态学
生物
热力学
复合材料
作者
Moungi G. Bawendi,William L. Wilson,Lewis J. Rothberg,P Carroll,T. M. Jedju,Michael L. Steigerwald,L. E. Brus
标识
DOI:10.1103/physrevlett.65.1623
摘要
We use transient optical hole burning and photoluminescence to investigate the static and dynamic electronic properties of 32-\AA{} CdSe quantum dots. We observe a number of discrete electronic transitions, resolve LO-phonon progressions, and obtain homogeneous linewidths and electron--LO-phonon couplings. We find that the band-gap luminescence is not from the exciton state, but from a surface trapped state. Rapid (\ensuremath{\sim}160 fs) trapping into these surface states results in long-lived (\ensuremath{\sim}10--100 ns) bleach and induced-absorption features in pump-probe experiments.
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