1. Optical spin hall effect in exciton–polariton condensates in lead halide perovskite microcavities.
- Author
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Xiang, Bo, Li, Yiliu, Spencer, M. S., Dai, Yanan, Bai, Yusong, Basov, Dmitri N., and Zhu, X.-Y.
- Subjects
SPIN Hall effect ,BOSE-Einstein condensation ,LEAD halides ,CIRCULAR polarization ,QUANTUM fluids ,PEROVSKITE ,FLUX pinning - Abstract
An exciton–polariton condensate is a hybrid light–matter state in the quantum fluid phase. The photonic component endows it with characters of spin, as represented by circular polarization. Spin-polarization can form stochastically for quasi-equilibrium exciton–polariton condensates at parallel momentum vector k
|| ∼ 0 from bifurcation or deterministically for propagating condensates at k|| > 0 from the optical spin-Hall effect (OSHE). Here, we report deterministic spin-polarization in exciton–polariton condensates at k|| ∼ 0 in microcavities containing methylammonium lead bromide perovskite (CH3 NH3 PbBr3 ) single crystals under non-resonant and linearly polarized excitation. We observe two energetically split condensates with opposite circular polarizations and attribute this observation to the presence of strong birefringence, which introduces a large OSHE at k|| ∼ 0 and pins the condensates in a particular spin state. Such spin-polarized exciton–polariton condensates may serve not only as circularly polarized laser sources but also as effective alternatives to ultracold atom Bose–Einstein condensates in quantum simulators of many-body spin–orbit coupling processes. [ABSTRACT FROM AUTHOR]- Published
- 2024
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