Effect of interactions on vortices in a nonequilibrium polariton condensate.
We demonstrate the creation of vortices in a macroscopically occupied polariton state formed in a semiconductor microcavity. A weak external laser beam carrying orbital angular momentum (OAM) is used to imprint a vortex on the condensate arising from the polariton optical parametric oscillator (OPO). The vortex core radius is found to decrease with increasing pump power, and is determined by polariton-polariton interactions. As a result of OAM conservation in the parametric scattering process, the excitation consists of a vortex in the signal and a corresponding antivortex in the idler of the OPO. The experimental results are in good agreement with a theoretical model of a vortex in the polariton OPO.
Krizhanovskii
D N
DN
Department of Physics and Astronomy, University of Sheffield, Sheffield, S3 7RH, United Kingdom.
Whittaker
D M
DM
Bradley
R A
RA
Guda
K
K
Sarkar
D
D
Sanvitto
D
D
Vina
L
L
Cerda
E
E
Santos
P
P
Biermann
K
K
Hey
R
R
Skolnick
M S
MS