Optically monitored nuclear spin dynamics in individual GaAs quantum dots grown by droplet epitaxy

被引：41

作者：

Belhadj, Thomas ^{[1
]}

Kuroda, Takashi ^{[1
,2
]}

Simon, Claire-Marie ^{[1
]}

Amand, Thierry ^{[1
]}

Mano, Takaaki ^{[2
]}

Sakoda, Kazuaki ^{[2
]}

Koguchi, Nobuyuki ^{[3
,4
]}

Marie, Xavier ^{[1
]}

Urbaszek, Bernhard ^{[1
]}

机构：

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

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

[3] Univ Milano Bicocca, Dept Mat Sci, I-20125 Milan, Italy

[4] Univ Milano Bicocca, L NESS, I-20125 Milan, Italy

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 20期

关键词：

D O I：

10.1103/PhysRevB.78.205325

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on optical orientation experiments in individual strain-free GaAs quantum dots in AlGaAs grown by droplet epitaxy. Circularly polarized optical excitation yields strong circular polarization of the resulting photoluminescence at 4 K. Optical injection of spin-polarized electrons into a 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 we present a direct measurement of the buildup time of the nuclear polarization in a single GaAs dot in the order of 1 s.

引用

页数：7

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