Dynamics of coherent and incoherent spin polarizations in ensembles of quantum dots

被引：72

作者：

Tartakovskii, AI ^{[1
]}

Cahill, J

Makhonin, MN

Whittaker, DM

Wells, JPR

Fox, AM

Mowbray, DJ

Skolnick, MS

Groom, KM

Steer, MJ

Hopkinson, M

机构：

[1] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

[2] Univ Sheffield, Dept Elect & Elect Engn, Sheffield S1 3JD, S Yorkshire, England

[3] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.93.057401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The temperature dependence of spin coherence in InGaAs quantum dots is obtained from quantum beats observed in polarization-resolved pump-probe experiments. Within the same sample we clearly distinguish between coherent spin dynamics leading to quantum beats and incoherent long-lived spin-memory effects. Analysis of the coherent data using a theoretical model reveals approximate to10 times greater stability of the spin coherence at high temperature compared to that found previously for exciton states in four-wave-mixing experiments by Borri et al. [Phys. Rev. Lett. 87, 157401 (2001)]. The data on incoherent polarization reveal a new form of spin memory based on charged quantum dots.

引用

页码：057401 / 1

页数：4

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