Electron Spin Flip by Antiferromagnetic Coupling between Semiconductor Quantum Dots
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概要
- 論文の詳細を見る
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.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2003-07-15
著者
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YOKOYAMA Naoki
Fujitsu Laboratories Ltd.
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Tackeuchi Atsushi
Department Of Applied Physics Waseda University
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Murayama Masahiro
Department Of Applied Chemistry
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Nakata Yoshiaki
Fujitsu Laboratories Limited
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KITAMURA Takamitsu
Department of Applied Physics, Waseda University
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Kuroda Takamasa
Department Of Applied Physics Waseda University
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Yokoyama Naoki
Fujitsu Laboratories Ltd., 10-1 Morinosato-Wakamiya, Atsugi 243-0197, Japan
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Kitamura Takamitsu
Department of Applied Physics, Waseda University, Tokyo 169-8555, Japan
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Kuroda Takamasa
Department of Applied Physics, Waseda University, Tokyo 169-8555, Japan
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Murayama Masahiro
Department of Applied Physics, Waseda University, Tokyo 169-8555, Japan
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