Tailored quantum dots for entangled photon pair creation

被引：49

作者：

Greilich, A ^{[1
]}

Schwab, M

Berstermann, T

Auer, T

Oulton, R

Yakovlev, DR

Bayer, M

Stavarache, V

Reuter, D

Wieck, A

机构：

[1] Univ Dortmund, D-44221 Dortmund, Germany

[2] Ruhr Univ Bochum, D-44780 Bochum, Germany

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.73.045323

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We compare the asymmetry-induced exchange splitting delta(1) of the bright-exciton ground-state doublet in self-assembled (In,Ga)As/GaAs quantum dots, determined by Faraday rotation, with its homogeneous linewidth gamma, obtained from the radiative decay in time-resolved photoluminescence. Postgrowth thermal annealing of the dot structures leads to a considerable increase of the homogeneous linewidth, while a strong reduction of the exchange splitting is simultaneously observed. The annealing can be tailored such that delta(1) and gamma become comparable, whereupon the carriers are still well confined. This opens the possibility to observe polarization entangled photon pairs through the biexciton decay cascade.

引用

页数：4

共 22 条

[1]

[Anonymous], SEMICONDUCTOR SPINTR

[2] Fine structure of neutral and charged excitons in self-assembled In(Ga)As/(Al)GaAs quantum dots -: art. no. 195315 [J].