Optical spin hall effect in exciton-polariton condensates in lead halide perovskite microcavities

Bo Xiang; Yiliu Li; M S Spencer; Yanan Dai; Yusong Bai; Dmitri N Basov; X-Y Zhu

doi:10.1063/5.0202341

Optical spin hall effect in exciton-polariton condensates in lead halide perovskite microcavities

J Chem Phys. 2024 Apr 28;160(16):161104. doi: 10.1063/5.0202341.

Authors

Bo Xiang¹, Yiliu Li¹, M S Spencer¹, Yanan Dai¹, Yusong Bai¹, Dmitri N Basov², X-Y Zhu¹

Affiliations

¹ Department of Chemistry, Columbia University, New York, New York 10027, USA.
² Department of Physics and Astronomy, Columbia University, New York, New York 10027, USA.

PMID: 38661194
DOI: 10.1063/5.0202341

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 (CH3NH3PbBr3) 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.