Excitonic photoluminescence in semiconductor quantum wells: plasma versus excitons.
Time-resolved photoluminescence spectra after nonresonant excitation show a distinct 1s resonance, independent of the existence of bound excitons. A microscopic analysis identifies exciton and electron-hole plasma contributions. For low temperatures and low densities, the excitonic emission is extremely sensitive to details of the electron-hole-pair population making it possible to identify even minute fractions of optically active excitons.
Optical Sciences Center, The University of Arizona, Tucson, Arizona 85721-0094, USA.
S
S
Chatterjee
C
C
Ell
S
S
Mosor
G
G
Khitrova
H M
HM
Gibbs
W
W
Hoyer
M
M
Kira
S W
SW
Koch
J P
JP
Prineas
H
H
Stolz