Antiferromagnetic coupling between semiconductor quantum dots

A. Tackeuchi; T. Kuroda; R. Sasou; Y. Nakata; N. Yokoyama

doi:10.1016/S0921-4526(01)01394-1

Antiferromagnetic coupling between semiconductor quantum dots

A. Tackeuchi, T. Kuroda, R. Sasou, Y. Nakata, N. Yokoyama

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

We have investigated magnetic coupling between semiconductor quantum dots. The antiferromagnetization process based on the interdot exchange interaction has been directly observed using time-resolved spin-dependent photoluminescence measurements. The antiferromagnetic order that proves the interdot exchange interaction energy to be negative is found to exist at temperatures lower than 50-80 K. The spin relaxation time under the antiferromagnetic order is extended to 10-12 ns, an order of magnitude longer than that in isolated quantum dots.

Original language	English
Pages (from-to)	25-29
Number of pages	5
Journal	Physica B: Condensed Matter
Volume	314
Issue number	1-4
DOIs	https://doi.org/10.1016/S0921-4526(01)01394-1
Publication status	Published - 2002 Mar 1

Keywords

Antiferromagnetization
Quantum dots
Spin

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/S0921-4526(01)01394-1

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AU - Tackeuchi, A.

AU - Kuroda, T.

AU - Sasou, R.

AU - Nakata, Y.

AU - Yokoyama, N.

PY - 2002/3/1

Y1 - 2002/3/1

N2 - We have investigated magnetic coupling between semiconductor quantum dots. The antiferromagnetization process based on the interdot exchange interaction has been directly observed using time-resolved spin-dependent photoluminescence measurements. The antiferromagnetic order that proves the interdot exchange interaction energy to be negative is found to exist at temperatures lower than 50-80 K. The spin relaxation time under the antiferromagnetic order is extended to 10-12 ns, an order of magnitude longer than that in isolated quantum dots.

AB - We have investigated magnetic coupling between semiconductor quantum dots. The antiferromagnetization process based on the interdot exchange interaction has been directly observed using time-resolved spin-dependent photoluminescence measurements. The antiferromagnetic order that proves the interdot exchange interaction energy to be negative is found to exist at temperatures lower than 50-80 K. The spin relaxation time under the antiferromagnetic order is extended to 10-12 ns, an order of magnitude longer than that in isolated quantum dots.

KW - Antiferromagnetization

KW - Quantum dots

KW - Spin

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