### 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.

元の言語 | 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 |

発行部数 | 7 A |

出版物ステータス | Published - 2003 7 |

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### ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)

### これを引用

*Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers*,

*42*(7 A), 4278-4281.

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

研究成果: Article

*Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers*, 巻. 42, 番号 7 A, pp. 4278-4281.

}

TY - JOUR

T1 - Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots

AU - Tackeuchi, Atsushi

AU - Kuroda, Takamasa

AU - Nakata, Yoshiaki

AU - Murayama, Masahiro

AU - Kitamura, Takamitsu

AU - Yokoyama, Naoki

PY - 2003/7

Y1 - 2003/7

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.

KW - Antiferromagnetism

KW - Quantum dot

KW - Semiconductor

KW - Spin

UR - http://www.scopus.com/inward/record.url?scp=0141718366&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0141718366&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0141718366

VL - 42

SP - 4278

EP - 4281

JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

SN - 0021-4922

IS - 7 A

ER -