Dynamic nuclear polarization of a single charge-tunable InAs/GaAs quantum dot

被引：102

作者：

Eble, B.

Krebs, O.

Lemaitre, A.

Kowalik, K.

Kudelski, A.

Voisin, P.

Urbaszek, B.

Marie, X.

Amand, T.

机构：

[1] CNRS, Lab Photon & Nanostrcut, F-91460 Marcoussis, France

[2] Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland

[3] Inst Natl Sci Appl, Lab Nanophys Magnetisme & Optoelect, F-31077 Toulouse 4, France

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 08期

关键词：

D O I：

10.1103/PhysRevB.74.081306

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the dynamic nuclear polarization of a single charge-tunable self-assembled InAs/GaAs quantum dot in a longitudinal magnetic field of similar to 0.2 T. The hyperfine interaction between the optically oriented electron and nuclear spins leads to the polarization of the quantum dot nuclei measured by the Overhauser shift of the singly charged excitons (X+ and X-). When going from X+ to X-, we observe a reversal of this shift, which reflects the average electron spin optically written in the quantum dot either in the X+ state or in the final state of X- recombination. We discuss a theoretical model which indicates an efficient depolarization mechanism for the nuclei limiting their polarization to similar to 10%.

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页数：4

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