Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots

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

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)4278-4281
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume42
Issue number7 A
Publication statusPublished - 2003 Jul 1

Keywords

  • Antiferromagnetism
  • Quantum dot
  • Semiconductor
  • Spin

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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