Crossover from exciton to biexciton polaritons in semiconductor microcavities
Pump-probe measurements in a microcavity containing a quantum well show that a population of circularly polarized ( sigma(+)) excitons can completely inhibit the transition to sigma(-) one-exciton states by transferring the oscillator strength to the biexcitonic resonance. With increasing pump intensity the linear exciton-polariton doublet evolves into a triplet polariton structure and finally into a shifted biexciton-polariton doublet. A theoretical model of interacting excitons demonstrates that the crossover from exciton to biexciton polaritons is driven by three-exciton Coulomb correlation.
Saba
M
Physics Department, Federal Institute of Technology, PH-Ecublens, CH-1015 Lausanne, Switzerland.
Quochi
F
Ciuti
C
Oesterle
U
Staehli
JL
Deveaud
B
Bongiovanni
G
Mura
A