Impact of artificial lateral quantum confinement on exciton-spin relaxation in a two-dimensional GaAs electronic system

Takayuki Kiba; Toru Tanaka; Yosuke Tamura; Akio Higo; Cedric Thomas; Seiji Samukawa; Akihiro Murayama

doi:10.1063/1.4897958

AIP Advances (Oct 2014)

Impact of artificial lateral quantum confinement on exciton-spin relaxation in a two-dimensional GaAs electronic system

Takayuki Kiba,
Toru Tanaka,
Yosuke Tamura,
Akio Higo,
Cedric Thomas,
Seiji Samukawa,
Akihiro Murayama

Affiliations

Takayuki Kiba: Graduate School of Information Science and Technology, Hokkaido University, Kita 14, Nishi 9, Kita-ku, Sapporo, Japan
Toru Tanaka: Graduate School of Information Science and Technology, Hokkaido University, Kita 14, Nishi 9, Kita-ku, Sapporo, Japan
Yosuke Tamura: Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan
Akio Higo: WPI-AIMR, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan
Cedric Thomas: Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan
Seiji Samukawa: Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan
Akihiro Murayama: Graduate School of Information Science and Technology, Hokkaido University, Kita 14, Nishi 9, Kita-ku, Sapporo, Japan

DOI: https://doi.org/10.1063/1.4897958
Journal volume & issue: Vol. 4, no. 10
pp. 107112 – 107112-7

Abstract

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We demonstrate the effect of artificial lateral quantum confinement on exciton-spin relaxation in a GaAs electronic system. GaAs nanodisks (NDs) were fabricated from a quantum well (QW) by top-down nanotechnology using neutral-beam etching aided by protein-engineered bio-nano-templates. The exciton-spin relaxation time was 1.4 ns due to ND formation, significantly extended compared to 0.44 ns for the original QW, which is attributed to weakening of the hole-state mixing in addition to freezing of the carrier momentum. The temperature dependence of the spin-relaxation time depends on the ND thickness, reflecting the degree of quantum confinement.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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