抄録
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.
本文言語 | English |
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ページ(範囲) | 4278-4281 |
ページ数 | 4 |
ジャーナル | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
巻 | 42 |
号 | 7 A |
DOI | |
出版ステータス | Published - 2003 7月 |
ASJC Scopus subject areas
- 工学(全般)
- 物理学および天文学(全般)