Observation of sub-Poissonian correlation in spin-orbit coupled polariton vortex pairs at room temperature
arxiv(2024)
Abstract
Coupling of orbital and spin degrees of freedom gives rise to intriguing
physical phenomena in bosonic condensates, such as formation of stripe phases
and domains with vortex arrays. However, the robust locking of spin and orbital
degrees of freedom of the nonlinear topological objects such as vortex pairs
with sub-Poissonian fluctuation in bosonic condensates remains challenging. In
the present work, we realize a non-equilibrium room-temperature condensate in a
liquid crystal (LC) planar photonic microcavity with the perovskite CsPbBr3 as
optically active material. We use the interplay of TE-TM mode splitting and
Rashba-Dresselhaus spin-orbit coupling (RDSOC) to realize electrically tunable
polariton vortex pairs with locked spin and orbital angular momentum.
Remarkably, the counts difference between opposite wavevector states shows
sub-Poissonian fluctuation, indicating the existence of the correlation between
the two vortices. Our results are robust against sample imperfections and pave
the way to investigate coupling and locking of correlated vortex orbital and
spin degrees of freedom in a quantum fluid of light at room temperature,
offering potential for generation of complex squeezed states of light for
quantum optical information processing with optoelectronic chips
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