Near-field coherent excitation spectroscopy of InGaAs/GaAs self-assembled quantum dots

被引：50
|
作者：
Toda, Y [1 ]
Sugimoto, T [1 ]
Nishioka, M [1 ]
Arakawa, Y [1 ]
机构：
[1] Univ Tokyo, Inst Ind Sci, Minato Ku, Tokyo 106, Japan
来源：
APPLIED PHYSICS LETTERS | 2000年 / 76卷 / 26期
关键词：
D O I：
10.1063/1.126810
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Using near-field optical microscopy, we have performed coherent excitation spectroscopy of self-assembled quantum dots (SAQDs). A pair of coherent pulses with a time delay between them allows measurement of the temporal coherence of the carrier wave function in single quantum dots. The observed decoherence time is about 15 ps and is well explained by resonant Raman scattering of phonons. Furthermore, quantum beats originating from the superposition of two closely spaced coherent states have been observed. This opens up possibilities of quantum mechanical control of the carrier wave function in SAQDs. (C) 2000 American Institute of Physics. [S0003-6951(00)01426-1].
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页码：3887 / 3889
页数：3
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