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Stochastic spin flips in polariton condensates: Nonlinear tuning from GHz to sub-Hz

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Title: Stochastic spin flips in polariton condensates: Nonlinear tuning from GHz to sub-Hz

Author(s): Del Valle-Inclan Redondo Y.; Ohadi H.; Yuri G Rubo; Beer O.; Ramsay A.J.; Tsintzos S.I.; Hatzopoulos Z.; Savvidis P.G.; Baumberg J.J.

Subject: chaos, ; driven-dissipative, ; exciton-polariton, ; non-equilibrium condensate, ; spin dynamics

Abstract: The stability of spin of macroscopic quantum states to intrinsic noise is studied for non-resonantly-pumped optically-trapped polariton condensates. We demonstrate flipping between the two spin-polarised states with >104 slow-down of the flip rate by tuning the optical pump power. Individual spin flips faster than 50 ps are time resolved using single-shot streak camera imaging. We reproduce our results within a mean-field model accounting for cross-spin scattering between excitons and polaritons, yielding a ratio of cross- to co-spin scattering of ∼0.6, in contrast with previous literature suggestions. © 2018 The Author(s). Published by IOP Publishing Ltd on behalf of Deutsche Physikalische Gesellschaft