Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots

被引：12
作者：
Tackeuchi, A [1 ]
Kuroda, T
Nakata, Y
Murayama, M
Kitamura, T
Yokoyama, N
机构：
[1] Waseda Univ, Dept Appl Phys, Tokyo 1698555, Japan
[2] Japan Sci & Tecnol Corp, PRESTO, Kawaguchi 3320012, Japan
[3] Fujitsu Labs Ltd, Atsugi, Kanagawa 2430197, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 2003年 / 42卷 / 7A期
关键词：
spin; antiferromagnetism; quantum dot; semiconductor;
D O I：
10.1143/JJAP.42.4278
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have investigated antiferromagnetic coupling between semiconductor quantum dots. Electron spin is observed to flip at 80 ps after photoexcitation via the interdot-exchange interaction. The spin relaxation time under the antiferromagnetic order is extended to 10-12 ns, one order of magnitude longer than that in isolated quantum dots. The antiferromagnetic order exists at temperatures lower than 50-80 K. The photoluminescence experiments for various carrier densities show that antiferromagnetic coupling disappears when the electron pairing probability is low. A model calculation based on the Heitler-London approximation supports the finding that the antiferromagnetic order is observable at low temperature.
引用
收藏
页码：4278 / 4281
页数：4
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