Fast exciton spin relaxation in single quantum dots -: art. no. 233304

被引：44

作者：

Favero, I

Cassabois, G

Voisin, C

Delalande, C

Roussignol, P

Ferreira, R

Couteau, C

Poizat, JP

Gérard, JM

机构：

[1] Ecole Normale Super, Lab Pierre Aigrain, F-75231 Paris, France

[2] UJF, CNRS, CEA, Spectrometrie Phys Lab,Nanophys & Semicond Lab, F-38402 St Martin Dheres, France

[3] UJF, CNRS, CEA, Nanophys & Semicond Lab,DRFMC,SP2M, F-38054 St Martin Dheres, France

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.71.233304

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Exciton spin relaxation is investigated in single epitaxially grown semiconductor quantum dots in order to test the expected spin relaxation quenching in this system. We study the polarization anisotropy of the photoluminescence signal emitted by isolated quantum dots under steady-state or pulsed nonresonant excitation. We find that the longitudinal exciton spin relaxation time is strikingly short (<= 100 ps) even at low temperature. This result breaks down the picture of a frozen exciton spin in quantum dots.

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页数：4

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