Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots

Atsushi Tackeuchi; Takamasa Kuroda; Yoshiaki Nakata; Masahiro Murayama; Takamitsu Kitamura; Naoki Yokoyama

doi:10.1143/jjap.42.4278

Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots

Atsushi Tackeuchi^*, Takamasa Kuroda, Yoshiaki Nakata, Masahiro Murayama, Takamitsu Kitamura, Naoki Yokoyama

^*この研究の対応する著者

先進理工学部

研究成果: Article › 査読

12 被引用数 (Scopus)

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
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	https://doi.org/10.1143/jjap.42.4278
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）

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10.1143/jjap.42.4278

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Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots. / Tackeuchi, Atsushi; Kuroda, Takamasa; Nakata, Yoshiaki; Murayama, Masahiro; Kitamura, Takamitsu; Yokoyama, Naoki.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 42, No. 7 A, 07.2003, p. 4278-4281.

研究成果: Article › 査読

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AU - Nakata, Yoshiaki

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AU - Yokoyama, Naoki

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N2 - 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.

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Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots

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