Electrical control of hole spin relaxation in charge tunable InAs/GaAs quantum dots -: art. no. 147401

被引：71

作者：

Laurent, S

Eble, B

Krebs, O

Lemaître, A

Urbaszek, B

Marie, X

Amand, T

Voisin, P

机构：

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

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

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.94.147401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on optical orientation of singly charged excitons (trions) in charge-tunable self-assembled InAs/GaAs quantum dots. When the charge varies from 0 to -2, the trion photoluminescence of a single quantum dot shows up and under quasiresonant excitation gets progressively polarized from zero to similar to 100%. This behavior is interpreted as the electric control of the trion thermalization process, which subsequently acts on the hole-spin relaxation driven in nanosecond time scale by the anisotropic electron-hole exchange. This is supported by the excitation spectroscopy and time-resolved measurements of a quantum dot ensemble.

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页数：4

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