Long coherence times in self-assembled semiconductor quantum dots

被引：8

作者：

Birkedal, D ^{[1
]}

Leosson, K ^{[1
]}

Hvam, JM ^{[1
]}

机构：

[1] Tech Univ Denmark, Res Ctr COM, DK-2800 Lyngby, Denmark

来源：

SUPERLATTICES AND MICROSTRUCTURES | 2002年 / 31卷 / 2-4期

关键词：

homogeneous linewidth; coherence; dephasing; quantum dots; self-assembly;

D O I：

10.1006/spmi.2002.1031

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report measurements of ultra-long coherence in self-assembled quantum dots. Transient four-wave mixing experiments at 5 K show an average dephasing time of 372 ps, corresponding to a homogeneous linewidth of 3.5 mueV, which is significantly smaller than the linewidth observed in single-dot luminescence. Time-resolved luminescence measurements show a lifetime of the dot ground state of 800 ps demonstrating the presence of pure dephasing at finite temperature. The homogeneous width is lifetime limited only at temperatures approaching 0 K. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：97 / 105

页数：9

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