TY - JOUR

T1 - Microcavity polariton spin quantum beats without a magnetic field

T2 - A manifestation of Coulomb exchange in dense and polarized polariton systems

AU - Renucci, P.

AU - Amand, T.

AU - Marie, X.

AU - Senellart, P.

AU - Bloch, J.

AU - Sermage, B.

AU - Kavokin, K. V.

PY - 2005/8/15

Y1 - 2005/8/15

N2 - Microcavity polariton spin dynamics is investigated in high-finesse microcavities under resonant excitation using polarization- and time-resolved secondary emission spectroscopy. Using an appropriate calibration procedure, the instantaneous polariton occupation numbers of the modes with k 0 wave vectors can be determined. When the phase-matching conditions are achieved, we show that Coulomb scattering dominates the other processes, and that stimulation occurs when the occupation of the k 0 final state with a given mode polarization approaches unity. Under elliptically polarized light, we show that the stimulated polariton scattering leads to an increase with time of the circular polarization of the k 0 states, while the linear polarization dynamics is characterized first by a fast drop to negative or zero values immediately after the excitation pulse, followed by weak-amplitude nonperiodic oscillations. The latter are interpreted as the manifestation of the pseudospin precession of the pumped polariton modes around the self-induced exchange effective field.

AB - Microcavity polariton spin dynamics is investigated in high-finesse microcavities under resonant excitation using polarization- and time-resolved secondary emission spectroscopy. Using an appropriate calibration procedure, the instantaneous polariton occupation numbers of the modes with k 0 wave vectors can be determined. When the phase-matching conditions are achieved, we show that Coulomb scattering dominates the other processes, and that stimulation occurs when the occupation of the k 0 final state with a given mode polarization approaches unity. Under elliptically polarized light, we show that the stimulated polariton scattering leads to an increase with time of the circular polarization of the k 0 states, while the linear polarization dynamics is characterized first by a fast drop to negative or zero values immediately after the excitation pulse, followed by weak-amplitude nonperiodic oscillations. The latter are interpreted as the manifestation of the pseudospin precession of the pumped polariton modes around the self-induced exchange effective field.

UR - http://www.scopus.com/inward/record.url?scp=33644946137&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.72.075317

DO - 10.1103/PhysRevB.72.075317

M3 - Article

AN - SCOPUS:33644946137

VL - 72

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 7

M1 - 075317

ER -