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

^*Corresponding author for this work

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)

Cite this

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 - 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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KW - Spin

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Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots

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Keywords

ASJC Scopus subject areas

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