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 |
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Keywords
- Antiferromagnetism
- Quantum dot
- Semiconductor
- Spin
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
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, 07.2003, p. 4278-4281.Research output: Contribution to journal › Article
}
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 -