Optical orientation of electron and nuclear spins in strain free GaAs quantum dots grown by droplet epitaxy

被引：0

作者：

Belhadj, Thomas ^{[1
]}

Kuroda, Takashi ^{[1
,2
]}

Simon, Claire-Marie ^{[1
]}

Amand, Thierry ^{[1
]}

Mano, Takaaki ^{[2
]}

Sakoda, Kazuaki ^{[2
]}

Koguchi, Nobuyuki ^{[2
]}

Marie, Xavier ^{[1
]}

Urbaszek, Bernhard ^{[1
]}

机构：

[1] Univ Toulouse, LPCNO, INSA, CNRS,UPS, F-31077 Toulouse 4, France

[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2009年 / 246卷 / 04期

关键词：

RELAXATION; NMR;

D O I：

10.1002/pssb.200880576

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report optical orientation experiments in individual, strain, free GaAs quantum dots in AlGaAs grown by modified droplet epitaxy. Circularly polarized optical excitation yields strong circular polarization. of. the resulting photoluminescence at 4 K. Optical injection of spin polarized electrons into the dot gives rise to dynamical nuclear polarization that considerably changes the exciton Zeeman splitting (Overhauser shift). We show that the created nuclear polarization is bistable and present a direct measurement of the build up time of the nuclear polarization in a single GaAs dot in the order of a second. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：762 / 765

页数：4

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