Fine structure of excitons in InAs/GaAs coupled auantum dots: a sensitive test of electronic coupling.
Exciton fine structure in InAs/GaAs coupled quantum dots has been studied by photoluminescence spectroscopy in magnetic fields up to 8 T. Pronounced anticrossings and mixings of optically bright and dark states as functions of magnetic field are seen. A theoretical treatment of the mixing of the excitonic states has been developed, and it traces observed features to structural asymmetries. These results provide direct evidence for coherent coupling of excitons in quantum dot molecules.
Ortner
G
G
Experimentelle Physik II, Universität Dortmund, D-44221 Dortmund, Germany.
Bayer
M
M
Larionov
A
A
Timofeev
V B
VB
Forchel
A
A
Lyanda-Geller
Y B
YB
Reinecke
T L
TL
Hawrylak
P
P
Fafard
S
S
Wasilewski
Z
Z