Ultralong dephasing time in InGaAs quantum dots.
We measure a dephasing time of several hundred picoseconds at low temperature in the ground-state transition of strongly confined InGaAs quantum dots, using a highly sensitive four-wave mixing technique. Between 7 and 100 K the polarization decay has two distinct components resulting in a non-Lorentzian line shape with a lifetime-limited zero-phonon line and a broadband from elastic exciton-acoustic phonon interactions.
Borri
P
P
Experimentelle Physik IIb, Universität Dortmund, Otto-Hahn Strasse 4, D-44221 Dortmund, Germany.
Langbein
W
W
Schneider
S
S
Woggon
U
U
Sellin
R L
RL
Ouyang
D
D
Bimberg
D
D