Direct observation of the electron spin relaxation induced by nuclei in quantum dots

被引：220

作者：

Braun, PF

Marie, X

Lombez, L

Urbaszek, B

Amand, T

Renucci, P

Kalevich, VK

Kavokin, KV

Krebs, O

Voisin, P

Masumoto, Y

机构：

[1] Inst Natl Sci Appl, LNMO, F-31077 Toulouse, France

[2] IOFFE Inst, St Petersburg 194201, Russia

[3] Route Nozay, Lab Photon & Nanostruct, F-91460 Marcoussis, France

[4] Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 3058571, Japan

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.94.116601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied the electron spin relaxation in semiconductor InAs/ GaAs quantum dots by time-resolved optical spectroscopy. The average spin polarization of the electrons in an ensemble of p-doped quantum dots decays down to 1/3 of its initial value with a characteristic time T-Delta approximate to 500 ps, which is attributed to the hyperfine interaction with randomly oriented nuclear spins. We show that this efficient electron spin relaxation mechanism can be suppressed by an external magnetic field as small as 100 mT.We have studied the electron spin relaxation in semiconductor InAs/GaAs quantum dots by time-resolved optical spectroscopy. The average spin polarization of the electrons in an ensemble of p-doped quantum dots decays down to 1/3 of its initial value with a characteristic time T-Delta approximate to 500 ps, which is attributed to the hyperfine interaction with randomly oriented nuclear spins. We show that this efficient electron spin relaxation mechanism can be suppressed by an external magnetic field as small as 100 mT.

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页数：4

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