TY - JOUR
T1 - Tailored quantum dots for entangled photon pair creation
AU - Greilich, A
AU - Schwab, M
AU - Berstermann, T
AU - Auer, T
AU - Oulton, R
AU - Yakovlev, D R
AU - Bayer, M
AU - Stavarache, V
AU - Reuter, D
AU - Wieck, A
PY - 2006/1
Y1 - 2006/1
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevB.73.045323
DO - 10.1103/PhysRevB.73.045323
M3 - Article (Academic Journal)
VL - 73
SP - -
JO - Physical Review B: Condensed Matter and Materials Physics
JF - Physical Review B: Condensed Matter and Materials Physics
SN - 1098-0121
IS - 4
M1 - 045323
ER -