Control of fine-structure splitting of individual InAs quantum dots by rapid thermal annealing

被引：58

作者：

Ellis, D. J. P.

Stevenson, R. M.

Young, R. J.

Shields, A. J.

Atkinson, P.

Ritchie, D. A.

机构：

[1] Toshiba Res Europe Ltd, Cambridge Res Lab, Cambridge CB4 0WE, England

[2] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1063/1.2430489

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Degeneracy of the bright single exciton spin state is a prerequisite for the production of triggered polarization-entangled photon pairs from the biexciton decay of a quantum dot. Normally, however, the exciton spin states are split due to in-plane asymmetries. Here the authors demonstrate that the exciton splitting of an individual dot can be tuned through zero by thermal annealing. Repeated annealing blueshifts the exciton emission line of the dot, accompanied by a reduction and inversion in polarization splitting. Annealing is also demonstrated to control the detuning between the exciton and biexciton transitions in any selected dot.

引用

页数：3

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