INVESTIGATION OF FEMTOSECOND ELECTRONIC DEPHASING IN CDSE NANOCRYSTALS USING QUANTUM-BEAT-SUPPRESSED PHOTON-ECHOES

被引：161

作者：

SCHOENLEIN, RW

MITTLEMAN, DM

SHIANG, JJ

ALIVISATOS, AP

SHANK, CV

机构：

[1] UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720

[2] UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.70.1014

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first direct measurements of femtosecond electronic dephasing in CdSe nanocrystals using three-pulse photon echoes and a novel mode-suppression technique. We are able to separate the dynamics of the coherently excited LO phonons from the underlying electron-hole dephasing by suppressing the quantum beats. The homogeneous linewidth of these materials at 15 K results from electronic dephasing in approximately 85 fs, approximately half of which is due to acoustic phonon modes. Contributions from acoustic phonons dominate the homogeneous linewidth at room temperature.

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页码：1014 / 1017

页数：4

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