Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots

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

Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots

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

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	4278-4281
Number of pages	4
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	42
Issue number	7 A
Publication status	Published - 2003 Jul 1

Keywords

Antiferromagnetism
Quantum dot
Semiconductor
Spin

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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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, 01.07.2003, p. 4278-4281.

Research output: Contribution to journal › Article › peer-review

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AU - Nakata, Yoshiaki

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AU - Kitamura, Takamitsu

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.

AB - 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

Abstract

Keywords

ASJC Scopus subject areas

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