Pinning and depinning of the polarization of exciton-polariton condensates at room temperature.
A room temperature polariton condensate realized in a microcavity with embedded GaN quantum wells emits linearly polarized light at threshold with the plane of polarization pinned to one of the crystallographic axes. With increasing pumping power, a depinning of the polarization is observed resulting in a progressive decrease of the polarization degree of the emitted light. This depinning is understood in terms of polariton-polariton repulsion competing with the static disorder potential effect. The polarization behavior differs from that of conventional lasers where the polarization degree usually increases as a function of pumping power.
Levrat
J
J
Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
Butté
R
R
Christian
T
T
Glauser
M
M
Feltin
E
E
Carlin
J-F
JF
Grandjean
N
N
Read
D
D
Kavokin
A V
AV
Rubo
Y G
YG