Persistent High Polarization of Excited Spin Ensembles During Light Emission in Semiconductor Quantum-Dot-Well Hybrid Nanosystems

Takeishi, Kazuki; Hiura, Satoshi; Takayama, Junichi et al.

Physical review applied, 2018, 10(3), 034015

Permalink : https://hdl.handle.net/2115/71643

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論文情報

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アクセス権
open access
URI
https://hdl.handle.net/2115/71643
タイトル
Persistent High Polarization of Excited Spin Ensembles During Light Emission in Semiconductor Quantum-Dot-Well Hybrid Nanosystems
著者
Takeishi, Kazuki ; Hiura, Satoshi ; Takayama, Junichi ; Itabashi, Kodai ; Urabe, Masayuki ; Washida, Akihiro ; Kiba, Takayuki ; Murayama, Akihiro
著者名
Takeishi, Kazuki
著者名
Hiura, Satoshi
著者名
Takayama, Junichi
著者名
Itabashi, Kodai
著者名
Urabe, Masayuki
著者名
Washida, Akihiro
e-Rad_Researcher
40567236
著者名
Kiba, Takayuki
e-Rad_Researcher
00333906
著者名
Murayama, Akihiro
言語
英語
発行日
2018-09-10
出版者
American Physical Society (APS)
収録物名
Physical review applied
巻(号)
10(3)
ページ
034015
抄録
We demonstrate persistent high degrees of spin polarization (SPD) up to 70% during light emission in (In1-xGax) As quantum-dot-well (QD-QW) hybrid nanosystems, where QD excited states are laterally tunnel coupled through the adjacent two-dimensional QW potential depending on the QW thickness. Spinpolarized electrons are photo-excited by using circularly polarized light pulses. The decay time of spin relaxation, obtained by that of the SPD, is 70 times larger than the photoluminescence decay time. The temporally constant SPD is sustained by a selective transfer of minority spins among QDs after flipping from the majority spins, which is promoted by a moderate state filling of lower-energy spin sublevels in surrounding QDs. The spin transfer times are deduced as functions of the QW thickness and excited-spin density. These results can provide a precise control of lateral interdot spin-transfer dynamics and resultant suppression of spin relaxation in QD ensembles.
資源タイプ
学術雑誌論文
出版タイプ
Version of Record
権利情報
©2018 American Physical Society
PISSN
2331-7019
関連情報 (isIdenticalTo)
出版社版DOI
https://doi.org/10.1103/PhysRevApplied.10.034015